diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 4b0dc4cf2..0f96b12cf 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -21,22 +21,15 @@
window = freeGlobal;
}
- /** Used for array and object method references */
- var arrayRef = [],
- objectRef = {};
-
/** Used to generate unique IDs */
var idCounter = 0;
/** Used internally to indicate various things */
- var indicatorObject = objectRef;
+ var indicatorObject = {};
/** Used by `cachedContains` as the default size when optimizations are enabled for large arrays */
var largeArraySize = 30;
- /** Used to restore the original `_` reference in `noConflict` */
- var oldDash = window._;
-
/** Used to match HTML entities */
var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g;
@@ -48,13 +41,6 @@
/** Used to match regexp flags from their coerced string values */
var reFlags = /\w*$/;
- /** Used to detect if a method is native */
- var reNative = RegExp('^' +
- (objectRef.valueOf + '')
- .replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
- .replace(/valueOf|for [^\]]+/g, '.+?') + '$'
- );
-
/**
* Used to match ES6 template delimiters
* http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6
@@ -82,25 +68,6 @@
/** Used to make template sourceURLs easier to identify */
var templateCounter = 0;
- /** Native method shortcuts */
- var ceil = Math.ceil,
- concat = arrayRef.concat,
- floor = Math.floor,
- getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
- hasOwnProperty = objectRef.hasOwnProperty,
- push = arrayRef.push,
- toString = objectRef.toString;
-
- /* Native method shortcuts for methods with the same name as other `lodash` methods */
- var nativeBind = reNative.test(nativeBind = slice.bind) && nativeBind,
- nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
- nativeIsFinite = window.isFinite,
- nativeIsNaN = window.isNaN,
- nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,
- nativeMax = Math.max,
- nativeMin = Math.min,
- nativeRandom = Math.random;
-
/** `Object#toString` result shortcuts */
var argsClass = '[object Arguments]',
arrayClass = '[object Array]',
@@ -112,88 +79,6 @@
regexpClass = '[object RegExp]',
stringClass = '[object String]';
- /** Detect various environments */
- var isIeOpera = !!window.attachEvent,
- isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera);
-
- /* Detect if `Function#bind` exists and is inferred to be fast (all but V8) */
- var isBindFast = nativeBind && !isV8;
-
- /* Detect if `Object.keys` exists and is inferred to be fast (IE, Opera, V8) */
- var isKeysFast = nativeKeys && (isIeOpera || isV8);
-
- /**
- * Detect the JScript [[DontEnum]] bug:
- *
- * In IE < 9 an objects own properties, shadowing non-enumerable ones, are
- * made non-enumerable as well.
- */
- var hasDontEnumBug;
-
- /**
- * Detect if a `prototype` properties are enumerable by default:
- *
- * Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1
- * (if the prototype or a property on the prototype has been set)
- * incorrectly sets a function's `prototype` property [[Enumerable]]
- * value to `true`.
- */
- var hasEnumPrototype;
-
- /** Detect if own properties are iterated after inherited properties (IE < 9) */
- var iteratesOwnLast;
-
- /**
- * Detect if `Array#shift` and `Array#splice` augment array-like objects
- * incorrectly:
- *
- * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()`
- * and `splice()` functions that fail to remove the last element, `value[0]`,
- * of array-like objects even though the `length` property is set to `0`.
- * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
- * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
- */
- var hasObjectSpliceBug = (hasObjectSpliceBug = { '0': 1, 'length': 1 },
- arrayRef.splice.call(hasObjectSpliceBug, 0, 1), hasObjectSpliceBug[0]);
-
- /** Detect if `arguments` object indexes are non-enumerable (Firefox < 4, IE < 9, PhantomJS, Safari < 5.1) */
- var nonEnumArgs = true;
-
- (function() {
- var props = [];
- function ctor() { this.x = 1; }
- ctor.prototype = { 'valueOf': 1, 'y': 1 };
- for (var prop in new ctor) { props.push(prop); }
- for (prop in arguments) { nonEnumArgs = !prop; }
-
- hasDontEnumBug = !/valueOf/.test(props);
- hasEnumPrototype = ctor.propertyIsEnumerable('prototype');
- iteratesOwnLast = props[0] != 'x';
- }(1));
-
- /** Detect if `arguments` objects are `Object` objects (all but Opera < 10.5) */
- var argsAreObjects = arguments.constructor == Object;
-
- /** Detect if `arguments` objects [[Class]] is unresolvable (Firefox < 4, IE < 9) */
- var noArgsClass = !isArguments(arguments);
-
- /**
- * Detect lack of support for accessing string characters by index:
- *
- * IE < 8 can't access characters by index and IE 8 can only access
- * characters by index on string literals.
- */
- var noCharByIndex = ('x'[0] + Object('x')[0]) != 'xx';
-
- /**
- * Detect if a DOM node's [[Class]] is unresolvable (IE < 9)
- * and that the JS engine won't error when attempting to coerce an object to
- * a string without a `toString` function.
- */
- try {
- var noNodeClass = toString.call(document) == objectClass && !({ 'toString': 0 } + '');
- } catch(e) { }
-
/** Used to identify object classifications that `_.clone` supports */
var cloneableClasses = {};
cloneableClasses[funcClass] = false;
@@ -202,16 +87,6 @@
cloneableClasses[numberClass] = cloneableClasses[objectClass] =
cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true;
- /** Used to lookup a built-in constructor by [[Class]] */
- var ctorByClass = {};
- ctorByClass[arrayClass] = Array;
- ctorByClass[boolClass] = Boolean;
- ctorByClass[dateClass] = Date;
- ctorByClass[objectClass] = Object;
- ctorByClass[numberClass] = Number;
- ctorByClass[regexpClass] = RegExp;
- ctorByClass[stringClass] = String;
-
/** Used to determine if values are of the language type Object */
var objectTypes = {
'boolean': false,
@@ -236,3310 +111,3340 @@
/*--------------------------------------------------------------------------*/
/**
- * Creates a `lodash` object, that wraps the given `value`, to enable method
- * chaining.
- *
- * In addition to Lo-Dash methods, wrappers also have the following `Array` methods:
- * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
- * and `unshift`
- *
- * The chainable wrapper functions are:
- * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, `compose`,
- * `concat`, `countBy`, `debounce`, `defaults`, `defer`, `delay`, `difference`,
- * `filter`, `flatten`, `forEach`, `forIn`, `forOwn`, `functions`, `groupBy`,
- * `initial`, `intersection`, `invert`, `invoke`, `keys`, `map`, `max`, `memoize`,
- * `merge`, `min`, `object`, `omit`, `once`, `pairs`, `partial`, `partialRight`,
- * `pick`, `pluck`, `push`, `range`, `reject`, `rest`, `reverse`, `shuffle`,
- * `slice`, `sort`, `sortBy`, `splice`, `tap`, `throttle`, `times`, `toArray`,
- * `union`, `uniq`, `unshift`, `values`, `where`, `without`, `wrap`, and `zip`
- *
- * The non-chainable wrapper functions are:
- * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`, `identity`,
- * `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`, `isEmpty`,
- * `isEqual`, `isFinite`, `isFunction`, `isNaN`, `isNull`, `isNumber`, `isObject`,
- * `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `join`, `lastIndexOf`,
- * `mixin`, `noConflict`, `pop`, `random`, `reduce`, `reduceRight`, `result`,
- * `shift`, `size`, `some`, `sortedIndex`, `template`, `unescape`, and `uniqueId`
- *
- * The wrapper functions `first` and `last` return wrapped values when `n` is
- * passed, otherwise they return unwrapped values.
- *
- * @name _
- * @constructor
- * @category Chaining
- * @param {Mixed} value The value to wrap in a `lodash` instance.
- * @returns {Object} Returns a `lodash` instance.
- */
- function lodash(value) {
- // exit early if already wrapped, even if wrapped by a different `lodash` constructor
- if (value && typeof value == 'object' && value.__wrapped__) {
- return value;
- }
- // allow invoking `lodash` without the `new` operator
- if (!(this instanceof lodash)) {
- return new lodash(value);
- }
- this.__wrapped__ = value;
- }
-
- /**
- * By default, the template delimiters used by Lo-Dash are similar to those in
- * embedded Ruby (ERB). Change the following template settings to use alternative
- * delimiters.
+ * Create a new `lodash` function using the given `context` object.
*
* @static
* @memberOf _
- * @type Object
+ * @category Utilities
+ * @param {Object} context The context object.
+ * @returns {Function} Returns the `lodash` function.
*/
- lodash.templateSettings = {
+ function runInContext(context) {
+ context || (context = window);
+
+ /** Native constructor references */
+ var Array = context.Array,
+ Boolean = context.Boolean,
+ Date = context.Date,
+ Function = context.Function,
+ Math = context.Math,
+ Number = context.Number,
+ Object = context.Object,
+ RegExp = context.RegExp,
+ String = context.String;
+
+ /** Used for `Array`, `Math`, and `Object` method references */
+ var arrayRef = Array(),
+ objectRef = Object();
+
+ /** Used to restore the original `_` reference in `noConflict` */
+ var oldDash = context._;
+
+ /** Used to detect if a method is native */
+ var reNative = RegExp('^' +
+ (objectRef.valueOf + '')
+ .replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+ .replace(/valueOf|for [^\]]+/g, '.+?') + '$'
+ );
+
+ /** Native method shortcuts */
+ var ceil = Math.ceil,
+ clearTimeout = context.clearTimeout,
+ concat = arrayRef.concat,
+ floor = Math.floor,
+ getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
+ hasOwnProperty = objectRef.hasOwnProperty,
+ push = arrayRef.push,
+ setTimeout = context.setTimeout,
+ toString = objectRef.toString;
+
+ /* Native method shortcuts for methods with the same name as other `lodash` methods */
+ var nativeBind = reNative.test(nativeBind = slice.bind) && nativeBind,
+ nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
+ nativeIsFinite = context.isFinite,
+ nativeIsNaN = context.isNaN,
+ nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,
+ nativeMax = Math.max,
+ nativeMin = Math.min,
+ nativeRandom = Math.random;
+
+ /** Detect various environments */
+ var isIeOpera = !!context.attachEvent,
+ isJSC = !/\n{2,}/.test(Function()),
+ isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera);
+
+ /* Detect if `Function#bind` exists and is inferred to be fast (all but V8) */
+ var isBindFast = nativeBind && !isV8;
+
+ /* Detect if `Object.keys` exists and is inferred to be fast (Firefox, IE, Opera, V8) */
+ var isKeysFast = nativeKeys && (isIeOpera || isV8 || !isJSC);
/**
- * Used to detect `data` property values to be HTML-escaped.
+ * Detect the JScript [[DontEnum]] bug:
*
- * @memberOf _.templateSettings
- * @type RegExp
+ * In IE < 9 an objects own properties, shadowing non-enumerable ones, are
+ * made non-enumerable as well.
*/
- 'escape': /<%-([\s\S]+?)%>/g,
+ var hasDontEnumBug;
/**
- * Used to detect code to be evaluated.
+ * Detect if a `prototype` properties are enumerable by default:
*
- * @memberOf _.templateSettings
- * @type RegExp
+ * Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1
+ * (if the prototype or a property on the prototype has been set)
+ * incorrectly sets a function's `prototype` property [[Enumerable]]
+ * value to `true`.
*/
- 'evaluate': /<%([\s\S]+?)%>/g,
+ var hasEnumPrototype;
+
+ /** Detect if own properties are iterated after inherited properties (IE < 9) */
+ var iteratesOwnLast;
/**
- * Used to detect `data` property values to inject.
+ * Detect if `Array#shift` and `Array#splice` augment array-like objects
+ * incorrectly:
*
- * @memberOf _.templateSettings
- * @type RegExp
+ * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()`
+ * and `splice()` functions that fail to remove the last element, `value[0]`,
+ * of array-like objects even though the `length` property is set to `0`.
+ * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
+ * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
*/
- 'interpolate': reInterpolate,
+ var hasObjectSpliceBug = (hasObjectSpliceBug = { '0': 1, 'length': 1 },
+ arrayRef.splice.call(hasObjectSpliceBug, 0, 1), hasObjectSpliceBug[0]);
+
+ /** Detect if `arguments` object indexes are non-enumerable (Firefox < 4, IE < 9, PhantomJS, Safari < 5.1) */
+ var nonEnumArgs = true;
+
+ (function() {
+ var props = [];
+ function ctor() { this.x = 1; }
+ ctor.prototype = { 'valueOf': 1, 'y': 1 };
+ for (var prop in new ctor) { props.push(prop); }
+ for (prop in arguments) { nonEnumArgs = !prop; }
+
+ hasDontEnumBug = !/valueOf/.test(props);
+ hasEnumPrototype = ctor.propertyIsEnumerable('prototype');
+ iteratesOwnLast = props[0] != 'x';
+ }(1));
+
+ /** Detect if `arguments` objects are `Object` objects (all but Opera < 10.5) */
+ var argsAreObjects = arguments.constructor == Object;
+
+ /** Detect if `arguments` objects [[Class]] is unresolvable (Firefox < 4, IE < 9) */
+ var noArgsClass = !isArguments(arguments);
/**
- * Used to reference the data object in the template text.
+ * Detect lack of support for accessing string characters by index:
*
- * @memberOf _.templateSettings
- * @type String
+ * IE < 8 can't access characters by index and IE 8 can only access
+ * characters by index on string literals.
*/
- 'variable': '',
+ var noCharByIndex = ('x'[0] + Object('x')[0]) != 'xx';
/**
- * Used to import variables into the compiled template.
+ * Detect if a DOM node's [[Class]] is unresolvable (IE < 9)
+ * and that the JS engine won't error when attempting to coerce an object to
+ * a string without a `toString` function.
+ */
+ try {
+ var noNodeClass = toString.call(document) == objectClass && !({ 'toString': 0 } + '');
+ } catch(e) { }
+
+ /** Used to lookup a built-in constructor by [[Class]] */
+ var ctorByClass = {};
+ ctorByClass[arrayClass] = Array;
+ ctorByClass[boolClass] = Boolean;
+ ctorByClass[dateClass] = Date;
+ ctorByClass[objectClass] = Object;
+ ctorByClass[numberClass] = Number;
+ ctorByClass[regexpClass] = RegExp;
+ ctorByClass[stringClass] = String;
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Creates a `lodash` object, that wraps the given `value`, to enable method
+ * chaining.
*
- * @memberOf _.templateSettings
+ * In addition to Lo-Dash methods, wrappers also have the following `Array` methods:
+ * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
+ * and `unshift`
+ *
+ * The chainable wrapper functions are:
+ * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, `compose`,
+ * `concat`, `countBy`, `debounce`, `defaults`, `defer`, `delay`, `difference`,
+ * `filter`, `flatten`, `forEach`, `forIn`, `forOwn`, `functions`, `groupBy`,
+ * `initial`, `intersection`, `invert`, `invoke`, `keys`, `map`, `max`, `memoize`,
+ * `merge`, `min`, `object`, `omit`, `once`, `pairs`, `partial`, `partialRight`,
+ * `pick`, `pluck`, `push`, `range`, `reject`, `rest`, `reverse`, `shuffle`,
+ * `slice`, `sort`, `sortBy`, `splice`, `tap`, `throttle`, `times`, `toArray`,
+ * `union`, `uniq`, `unshift`, `values`, `where`, `without`, `wrap`, and `zip`
+ *
+ * The non-chainable wrapper functions are:
+ * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`, `identity`,
+ * `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`, `isEmpty`,
+ * `isEqual`, `isFinite`, `isFunction`, `isNaN`, `isNull`, `isNumber`, `isObject`,
+ * `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `join`, `lastIndexOf`,
+ * `mixin`, `noConflict`, `pop`, `random`, `reduce`, `reduceRight`, `result`,
+ * `shift`, `size`, `some`, `sortedIndex`, `template`, `unescape`, and `uniqueId`
+ *
+ * The wrapper functions `first` and `last` return wrapped values when `n` is
+ * passed, otherwise they return unwrapped values.
+ *
+ * @name _
+ * @constructor
+ * @category Chaining
+ * @param {Mixed} value The value to wrap in a `lodash` instance.
+ * @returns {Object} Returns a `lodash` instance.
+ */
+ function lodash(value) {
+ // exit early if already wrapped, even if wrapped by a different `lodash` constructor
+ if (value && typeof value == 'object' && value.__wrapped__) {
+ return value;
+ }
+ // allow invoking `lodash` without the `new` operator
+ if (!(this instanceof lodash)) {
+ return new lodash(value);
+ }
+ this.__wrapped__ = value;
+ }
+
+ /**
+ * By default, the template delimiters used by Lo-Dash are similar to those in
+ * embedded Ruby (ERB). Change the following template settings to use alternative
+ * delimiters.
+ *
+ * @static
+ * @memberOf _
* @type Object
*/
- 'imports': {
+ lodash.templateSettings = {
/**
- * A reference to the `lodash` function.
+ * Used to detect `data` property values to be HTML-escaped.
*
- * @memberOf _.templateSettings.imports
- * @type Function
+ * @memberOf _.templateSettings
+ * @type RegExp
*/
- '_': lodash
- }
- };
+ 'escape': /<%-([\s\S]+?)%>/g,
- /*--------------------------------------------------------------------------*/
+ /**
+ * Used to detect code to be evaluated.
+ *
+ * @memberOf _.templateSettings
+ * @type RegExp
+ */
+ 'evaluate': /<%([\s\S]+?)%>/g,
- /**
- * The template used to create iterator functions.
- *
- * @private
- * @param {Obect} data The data object used to populate the text.
- * @returns {String} Returns the interpolated text.
- */
- var iteratorTemplate = function(obj) {
-
- var __p = 'var index, iterable = ' +
- (obj.firstArg ) +
- ', result = iterable;\nif (!iterable) return result;\n' +
- (obj.top ) +
- ';\n';
- if (obj.arrays) {
- __p += 'var length = iterable.length; index = -1;\nif (' +
- (obj.arrays ) +
- ') { ';
- if (obj.noCharByIndex) {
- __p += '\n if (isString(iterable)) {\n iterable = iterable.split(\'\')\n } ';
- } ;
- __p += '\n while (++index < length) {\n ' +
- (obj.loop ) +
- '\n }\n}\nelse { ';
- } else if (obj.nonEnumArgs) {
- __p += '\n var length = iterable.length; index = -1;\n if (length && isArguments(iterable)) {\n while (++index < length) {\n index += \'\';\n ' +
- (obj.loop ) +
- '\n }\n } else { ';
- } ;
-
- if (obj.hasEnumPrototype) {
- __p += '\n var skipProto = typeof iterable == \'function\';\n ';
- } ;
-
- if (obj.isKeysFast && obj.useHas) {
- __p += '\n var ownIndex = -1,\n ownProps = objectTypes[typeof iterable] ? nativeKeys(iterable) : [],\n length = ownProps.length;\n\n while (++ownIndex < length) {\n index = ownProps[ownIndex];\n ';
- if (obj.hasEnumPrototype) {
- __p += 'if (!(skipProto && index == \'prototype\')) {\n ';
- } ;
- __p +=
- (obj.loop ) +
- '';
- if (obj.hasEnumPrototype) {
- __p += '}\n';
- } ;
- __p += ' } ';
- } else {
- __p += '\n for (index in iterable) {';
- if (obj.hasEnumPrototype || obj.useHas) {
- __p += '\n if (';
- if (obj.hasEnumPrototype) {
- __p += '!(skipProto && index == \'prototype\')';
- } if (obj.hasEnumPrototype && obj.useHas) {
- __p += ' && ';
- } if (obj.useHas) {
- __p += 'hasOwnProperty.call(iterable, index)';
- } ;
- __p += ') { ';
- } ;
- __p +=
- (obj.loop ) +
- '; ';
- if (obj.hasEnumPrototype || obj.useHas) {
- __p += '\n }';
- } ;
- __p += '\n } ';
- } ;
-
- if (obj.hasDontEnumBug) {
- __p += '\n\n var ctor = iterable.constructor;\n ';
- for (var k = 0; k < 7; k++) {
- __p += '\n index = \'' +
- (obj.shadowed[k] ) +
- '\';\n if (';
- if (obj.shadowed[k] == 'constructor') {
- __p += '!(ctor && ctor.prototype === iterable) && ';
- } ;
- __p += 'hasOwnProperty.call(iterable, index)) {\n ' +
- (obj.loop ) +
- '\n } ';
- } ;
-
- } ;
-
- if (obj.arrays || obj.nonEnumArgs) {
- __p += '\n}';
- } ;
- __p +=
- (obj.bottom ) +
- ';\nreturn result';
-
-
- return __p
- };
+ /**
+ * Used to detect `data` property values to inject.
+ *
+ * @memberOf _.templateSettings
+ * @type RegExp
+ */
+ 'interpolate': reInterpolate,
- /** Reusable iterator options for `assign` and `defaults` */
- var defaultsIteratorOptions = {
- 'args': 'object, source, guard',
- 'top':
- 'var args = arguments,\n' +
- ' argsIndex = 0,\n' +
- " argsLength = typeof guard == 'number' ? 2 : args.length;\n" +
- 'while (++argsIndex < argsLength) {\n' +
- ' iterable = args[argsIndex];\n' +
- ' if (iterable && objectTypes[typeof iterable]) {',
- 'loop': "if (typeof result[index] == 'undefined') result[index] = iterable[index]",
- 'bottom': ' }\n}'
- };
+ /**
+ * Used to reference the data object in the template text.
+ *
+ * @memberOf _.templateSettings
+ * @type String
+ */
+ 'variable': '',
- /** Reusable iterator options shared by `each`, `forIn`, and `forOwn` */
- var eachIteratorOptions = {
- 'args': 'collection, callback, thisArg',
- 'top': "callback = callback && typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg)",
- 'arrays': "typeof length == 'number'",
- 'loop': 'if (callback(iterable[index], index, collection) === false) return result'
- };
+ /**
+ * Used to import variables into the compiled template.
+ *
+ * @memberOf _.templateSettings
+ * @type Object
+ */
+ 'imports': {
- /** Reusable iterator options for `forIn` and `forOwn` */
- var forOwnIteratorOptions = {
- 'top': 'if (!objectTypes[typeof iterable]) return result;\n' + eachIteratorOptions.top,
- 'arrays': false
- };
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Creates a function optimized to search large arrays for a given `value`,
- * starting at `fromIndex`, using strict equality for comparisons, i.e. `===`.
- *
- * @private
- * @param {Array} array The array to search.
- * @param {Mixed} value The value to search for.
- * @param {Number} [fromIndex=0] The index to search from.
- * @param {Number} [largeSize=30] The length at which an array is considered large.
- * @returns {Boolean} Returns `true`, if `value` is found, else `false`.
- */
- function cachedContains(array, fromIndex, largeSize) {
- fromIndex || (fromIndex = 0);
-
- var length = array.length,
- isLarge = (length - fromIndex) >= (largeSize || largeArraySize);
-
- if (isLarge) {
- var cache = {},
- index = fromIndex - 1;
-
- while (++index < length) {
- // manually coerce `value` to a string because `hasOwnProperty`, in some
- // older versions of Firefox, coerces objects incorrectly
- var key = array[index] + '';
- (hasOwnProperty.call(cache, key) ? cache[key] : (cache[key] = [])).push(array[index]);
+ /**
+ * A reference to the `lodash` function.
+ *
+ * @memberOf _.templateSettings.imports
+ * @type Function
+ */
+ '_': lodash
}
- }
- return function(value) {
+ };
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * The template used to create iterator functions.
+ *
+ * @private
+ * @param {Obect} data The data object used to populate the text.
+ * @returns {String} Returns the interpolated text.
+ */
+ var iteratorTemplate = function(obj) {
+
+ var __p = 'var index, iterable = ' +
+ (obj.firstArg ) +
+ ', result = iterable;\nif (!iterable) return result;\n' +
+ (obj.top ) +
+ ';\n';
+ if (obj.arrays) {
+ __p += 'var length = iterable.length; index = -1;\nif (' +
+ (obj.arrays ) +
+ ') { ';
+ if (obj.noCharByIndex) {
+ __p += '\n if (isString(iterable)) {\n iterable = iterable.split(\'\')\n } ';
+ } ;
+ __p += '\n while (++index < length) {\n ' +
+ (obj.loop ) +
+ '\n }\n}\nelse { ';
+ } else if (obj.nonEnumArgs) {
+ __p += '\n var length = iterable.length; index = -1;\n if (length && isArguments(iterable)) {\n while (++index < length) {\n index += \'\';\n ' +
+ (obj.loop ) +
+ '\n }\n } else { ';
+ } ;
+
+ if (obj.hasEnumPrototype) {
+ __p += '\n var skipProto = typeof iterable == \'function\';\n ';
+ } ;
+
+ if (obj.isKeysFast && obj.useHas) {
+ __p += '\n var ownIndex = -1,\n ownProps = objectTypes[typeof iterable] ? nativeKeys(iterable) : [],\n length = ownProps.length;\n\n while (++ownIndex < length) {\n index = ownProps[ownIndex];\n ';
+ if (obj.hasEnumPrototype) {
+ __p += 'if (!(skipProto && index == \'prototype\')) {\n ';
+ } ;
+ __p +=
+ (obj.loop ) +
+ '';
+ if (obj.hasEnumPrototype) {
+ __p += '}\n';
+ } ;
+ __p += ' } ';
+ } else {
+ __p += '\n for (index in iterable) {';
+ if (obj.hasEnumPrototype || obj.useHas) {
+ __p += '\n if (';
+ if (obj.hasEnumPrototype) {
+ __p += '!(skipProto && index == \'prototype\')';
+ } if (obj.hasEnumPrototype && obj.useHas) {
+ __p += ' && ';
+ } if (obj.useHas) {
+ __p += 'hasOwnProperty.call(iterable, index)';
+ } ;
+ __p += ') { ';
+ } ;
+ __p +=
+ (obj.loop ) +
+ '; ';
+ if (obj.hasEnumPrototype || obj.useHas) {
+ __p += '\n }';
+ } ;
+ __p += '\n } ';
+ } ;
+
+ if (obj.hasDontEnumBug) {
+ __p += '\n\n var ctor = iterable.constructor;\n ';
+ for (var k = 0; k < 7; k++) {
+ __p += '\n index = \'' +
+ (obj.shadowed[k] ) +
+ '\';\n if (';
+ if (obj.shadowed[k] == 'constructor') {
+ __p += '!(ctor && ctor.prototype === iterable) && ';
+ } ;
+ __p += 'hasOwnProperty.call(iterable, index)) {\n ' +
+ (obj.loop ) +
+ '\n } ';
+ } ;
+
+ } ;
+
+ if (obj.arrays || obj.nonEnumArgs) {
+ __p += '\n}';
+ } ;
+ __p +=
+ (obj.bottom ) +
+ ';\nreturn result';
+
+
+ return __p
+ };
+
+ /** Reusable iterator options for `assign` and `defaults` */
+ var defaultsIteratorOptions = {
+ 'args': 'object, source, guard',
+ 'top':
+ 'var args = arguments,\n' +
+ ' argsIndex = 0,\n' +
+ " argsLength = typeof guard == 'number' ? 2 : args.length;\n" +
+ 'while (++argsIndex < argsLength) {\n' +
+ ' iterable = args[argsIndex];\n' +
+ ' if (iterable && objectTypes[typeof iterable]) {',
+ 'loop': "if (typeof result[index] == 'undefined') result[index] = iterable[index]",
+ 'bottom': ' }\n}'
+ };
+
+ /** Reusable iterator options shared by `each`, `forIn`, and `forOwn` */
+ var eachIteratorOptions = {
+ 'args': 'collection, callback, thisArg',
+ 'top': "callback = callback && typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg)",
+ 'arrays': "typeof length == 'number'",
+ 'loop': 'if (callback(iterable[index], index, collection) === false) return result'
+ };
+
+ /** Reusable iterator options for `forIn` and `forOwn` */
+ var forOwnIteratorOptions = {
+ 'top': 'if (!objectTypes[typeof iterable]) return result;\n' + eachIteratorOptions.top,
+ 'arrays': false
+ };
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Creates a function optimized to search large arrays for a given `value`,
+ * starting at `fromIndex`, using strict equality for comparisons, i.e. `===`.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {Mixed} value The value to search for.
+ * @param {Number} [fromIndex=0] The index to search from.
+ * @param {Number} [largeSize=30] The length at which an array is considered large.
+ * @returns {Boolean} Returns `true`, if `value` is found, else `false`.
+ */
+ function cachedContains(array, fromIndex, largeSize) {
+ fromIndex || (fromIndex = 0);
+
+ var length = array.length,
+ isLarge = (length - fromIndex) >= (largeSize || largeArraySize);
+
if (isLarge) {
- var key = value + '';
- return hasOwnProperty.call(cache, key) && indexOf(cache[key], value) > -1;
+ var cache = {},
+ index = fromIndex - 1;
+
+ while (++index < length) {
+ // manually coerce `value` to a string because `hasOwnProperty`, in some
+ // older versions of Firefox, coerces objects incorrectly
+ var key = array[index] + '';
+ (hasOwnProperty.call(cache, key) ? cache[key] : (cache[key] = [])).push(array[index]);
+ }
}
- return indexOf(array, value, fromIndex) > -1;
- }
- }
-
- /**
- * Used by `_.max` and `_.min` as the default `callback` when a given
- * `collection` is a string value.
- *
- * @private
- * @param {String} value The character to inspect.
- * @returns {Number} Returns the code unit of given character.
- */
- function charAtCallback(value) {
- return value.charCodeAt(0);
- }
-
- /**
- * Used by `sortBy` to compare transformed `collection` values, stable sorting
- * them in ascending order.
- *
- * @private
- * @param {Object} a The object to compare to `b`.
- * @param {Object} b The object to compare to `a`.
- * @returns {Number} Returns the sort order indicator of `1` or `-1`.
- */
- function compareAscending(a, b) {
- var ai = a.index,
- bi = b.index;
-
- a = a.criteria;
- b = b.criteria;
-
- // ensure a stable sort in V8 and other engines
- // http://code.google.com/p/v8/issues/detail?id=90
- if (a !== b) {
- if (a > b || typeof a == 'undefined') {
- return 1;
- }
- if (a < b || typeof b == 'undefined') {
- return -1;
+ return function(value) {
+ if (isLarge) {
+ var key = value + '';
+ return hasOwnProperty.call(cache, key) && indexOf(cache[key], value) > -1;
+ }
+ return indexOf(array, value, fromIndex) > -1;
}
}
- return ai < bi ? -1 : 1;
- }
- /**
- * Creates a function that, when called, invokes `func` with the `this` binding
- * of `thisArg` and prepends any `partialArgs` to the arguments passed to the
- * bound function.
- *
- * @private
- * @param {Function|String} func The function to bind or the method name.
- * @param {Mixed} [thisArg] The `this` binding of `func`.
- * @param {Array} partialArgs An array of arguments to be partially applied.
- * @param {Object} [rightIndicator] Used to indicate partially applying arguments from the right.
- * @returns {Function} Returns the new bound function.
- */
- function createBound(func, thisArg, partialArgs, rightIndicator) {
- var isFunc = isFunction(func),
- isPartial = !partialArgs,
- key = thisArg;
-
- // juggle arguments
- if (isPartial) {
- partialArgs = thisArg;
- }
- if (!isFunc) {
- thisArg = func;
+ /**
+ * Used by `_.max` and `_.min` as the default `callback` when a given
+ * `collection` is a string value.
+ *
+ * @private
+ * @param {String} value The character to inspect.
+ * @returns {Number} Returns the code unit of given character.
+ */
+ function charAtCallback(value) {
+ return value.charCodeAt(0);
}
- function bound() {
- // `Function#bind` spec
- // http://es5.github.com/#x15.3.4.5
- var args = arguments,
- thisBinding = isPartial ? this : thisArg;
+ /**
+ * Used by `sortBy` to compare transformed `collection` values, stable sorting
+ * them in ascending order.
+ *
+ * @private
+ * @param {Object} a The object to compare to `b`.
+ * @param {Object} b The object to compare to `a`.
+ * @returns {Number} Returns the sort order indicator of `1` or `-1`.
+ */
+ function compareAscending(a, b) {
+ var ai = a.index,
+ bi = b.index;
+ a = a.criteria;
+ b = b.criteria;
+
+ // ensure a stable sort in V8 and other engines
+ // http://code.google.com/p/v8/issues/detail?id=90
+ if (a !== b) {
+ if (a > b || typeof a == 'undefined') {
+ return 1;
+ }
+ if (a < b || typeof b == 'undefined') {
+ return -1;
+ }
+ }
+ return ai < bi ? -1 : 1;
+ }
+
+ /**
+ * Creates a function that, when called, invokes `func` with the `this` binding
+ * of `thisArg` and prepends any `partialArgs` to the arguments passed to the
+ * bound function.
+ *
+ * @private
+ * @param {Function|String} func The function to bind or the method name.
+ * @param {Mixed} [thisArg] The `this` binding of `func`.
+ * @param {Array} partialArgs An array of arguments to be partially applied.
+ * @param {Object} [rightIndicator] Used to indicate partially applying arguments from the right.
+ * @returns {Function} Returns the new bound function.
+ */
+ function createBound(func, thisArg, partialArgs, rightIndicator) {
+ var isFunc = isFunction(func),
+ isPartial = !partialArgs,
+ key = thisArg;
+
+ // juggle arguments
+ if (isPartial) {
+ partialArgs = thisArg;
+ }
if (!isFunc) {
- func = thisArg[key];
+ thisArg = func;
}
- if (partialArgs.length) {
- args = args.length
- ? (args = slice(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args))
- : partialArgs;
- }
- if (this instanceof bound) {
- // ensure `new bound` is an instance of `bound` and `func`
- noop.prototype = func.prototype;
- thisBinding = new noop;
- noop.prototype = null;
- // mimic the constructor's `return` behavior
- // http://es5.github.com/#x13.2.2
- var result = func.apply(thisBinding, args);
- return isObject(result) ? result : thisBinding;
- }
- return func.apply(thisBinding, args);
- }
- return bound;
- }
+ function bound() {
+ // `Function#bind` spec
+ // http://es5.github.com/#x15.3.4.5
+ var args = arguments,
+ thisBinding = isPartial ? this : thisArg;
- /**
- * Produces a callback bound to an optional `thisArg`. If `func` is a property
- * name, the created callback will return the property value for a given element.
- * If `func` is an object, the created callback will return `true` for elements
- * that contain the equivalent object properties, otherwise it will return `false`.
- *
- * @private
- * @param {Mixed} [func=identity] The value to convert to a callback.
- * @param {Mixed} [thisArg] The `this` binding of the created callback.
- * @param {Number} [argCount=3] The number of arguments the callback accepts.
- * @returns {Function} Returns a callback function.
- */
- function createCallback(func, thisArg, argCount) {
- if (func == null) {
- return identity;
+ if (!isFunc) {
+ func = thisArg[key];
+ }
+ if (partialArgs.length) {
+ args = args.length
+ ? (args = slice(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args))
+ : partialArgs;
+ }
+ if (this instanceof bound) {
+ // ensure `new bound` is an instance of `bound` and `func`
+ noop.prototype = func.prototype;
+ thisBinding = new noop;
+ noop.prototype = null;
+
+ // mimic the constructor's `return` behavior
+ // http://es5.github.com/#x13.2.2
+ var result = func.apply(thisBinding, args);
+ return isObject(result) ? result : thisBinding;
+ }
+ return func.apply(thisBinding, args);
+ }
+ return bound;
}
- var type = typeof func;
- if (type != 'function') {
- if (type != 'object') {
+
+ /**
+ * Produces a callback bound to an optional `thisArg`. If `func` is a property
+ * name, the created callback will return the property value for a given element.
+ * If `func` is an object, the created callback will return `true` for elements
+ * that contain the equivalent object properties, otherwise it will return `false`.
+ *
+ * @private
+ * @param {Mixed} [func=identity] The value to convert to a callback.
+ * @param {Mixed} [thisArg] The `this` binding of the created callback.
+ * @param {Number} [argCount=3] The number of arguments the callback accepts.
+ * @returns {Function} Returns a callback function.
+ */
+ function createCallback(func, thisArg, argCount) {
+ if (func == null) {
+ return identity;
+ }
+ var type = typeof func;
+ if (type != 'function') {
+ if (type != 'object') {
+ return function(object) {
+ return object[func];
+ };
+ }
+ var props = keys(func);
return function(object) {
- return object[func];
+ var length = props.length,
+ result = false;
+ while (length--) {
+ if (!(result = isEqual(object[props[length]], func[props[length]], indicatorObject))) {
+ break;
+ }
+ }
+ return result;
};
}
- var props = keys(func);
- return function(object) {
- var length = props.length,
- result = false;
- while (length--) {
- if (!(result = isEqual(object[props[length]], func[props[length]], indicatorObject))) {
+ if (typeof thisArg != 'undefined') {
+ if (argCount === 1) {
+ return function(value) {
+ return func.call(thisArg, value);
+ };
+ }
+ if (argCount === 2) {
+ return function(a, b) {
+ return func.call(thisArg, a, b);
+ };
+ }
+ if (argCount === 4) {
+ return function(accumulator, value, index, object) {
+ return func.call(thisArg, accumulator, value, index, object);
+ };
+ }
+ return function(value, index, object) {
+ return func.call(thisArg, value, index, object);
+ };
+ }
+ return func;
+ }
+
+ /**
+ * Creates compiled iteration functions.
+ *
+ * @private
+ * @param {Object} [options1, options2, ...] The compile options object(s).
+ * arrays - A string of code to determine if the iterable is an array or array-like.
+ * useHas - A boolean to specify using `hasOwnProperty` checks in the object loop.
+ * args - A string of comma separated arguments the iteration function will accept.
+ * top - A string of code to execute before the iteration branches.
+ * loop - A string of code to execute in the object loop.
+ * bottom - A string of code to execute after the iteration branches.
+ *
+ * @returns {Function} Returns the compiled function.
+ */
+ function createIterator() {
+ var data = {
+ // support properties
+ 'hasDontEnumBug': hasDontEnumBug,
+ 'hasEnumPrototype': hasEnumPrototype,
+ 'isKeysFast': isKeysFast,
+ 'nonEnumArgs': nonEnumArgs,
+ 'noCharByIndex': noCharByIndex,
+ 'shadowed': shadowed,
+
+ // iterator options
+ 'arrays': 'isArray(iterable)',
+ 'bottom': '',
+ 'loop': '',
+ 'top': '',
+ 'useHas': true
+ };
+
+ // merge options into a template data object
+ for (var object, index = 0; object = arguments[index]; index++) {
+ for (var key in object) {
+ data[key] = object[key];
+ }
+ }
+ var args = data.args;
+ data.firstArg = /^[^,]+/.exec(args)[0];
+
+ // create the function factory
+ var factory = Function(
+ 'createCallback, hasOwnProperty, isArguments, isArray, isString, ' +
+ 'objectTypes, nativeKeys',
+ 'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
+ );
+ // return the compiled function
+ return factory(
+ createCallback, hasOwnProperty, isArguments, isArray, isString,
+ objectTypes, nativeKeys
+ );
+ }
+
+ /**
+ * A function compiled to iterate `arguments` objects, arrays, objects, and
+ * strings consistenly across environments, executing the `callback` for each
+ * element in the `collection`. The `callback` is bound to `thisArg` and invoked
+ * with three arguments; (value, index|key, collection). Callbacks may exit
+ * iteration early by explicitly returning `false`.
+ *
+ * @private
+ * @type Function
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function} [callback=identity] The function called per iteration.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array|Object|String} Returns `collection`.
+ */
+ var each = createIterator(eachIteratorOptions);
+
+ /**
+ * Used by `template` to escape characters for inclusion in compiled
+ * string literals.
+ *
+ * @private
+ * @param {String} match The matched character to escape.
+ * @returns {String} Returns the escaped character.
+ */
+ function escapeStringChar(match) {
+ return '\\' + stringEscapes[match];
+ }
+
+ /**
+ * Used by `escape` to convert characters to HTML entities.
+ *
+ * @private
+ * @param {String} match The matched character to escape.
+ * @returns {String} Returns the escaped character.
+ */
+ function escapeHtmlChar(match) {
+ return htmlEscapes[match];
+ }
+
+ /**
+ * Checks if `value` is a DOM node in IE < 9.
+ *
+ * @private
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true` if the `value` is a DOM node, else `false`.
+ */
+ function isNode(value) {
+ // IE < 9 presents DOM nodes as `Object` objects except they have `toString`
+ // methods that are `typeof` "string" and still can coerce nodes to strings
+ return typeof value.toString != 'function' && typeof (value + '') == 'string';
+ }
+
+ /**
+ * A no-operation function.
+ *
+ * @private
+ */
+ function noop() {
+ // no operation performed
+ }
+
+ /**
+ * Slices the `collection` from the `start` index up to, but not including,
+ * the `end` index.
+ *
+ * Note: This function is used, instead of `Array#slice`, to support node lists
+ * in IE < 9 and to ensure dense arrays are returned.
+ *
+ * @private
+ * @param {Array|Object|String} collection The collection to slice.
+ * @param {Number} start The start index.
+ * @param {Number} end The end index.
+ * @returns {Array} Returns the new array.
+ */
+ function slice(array, start, end) {
+ start || (start = 0);
+ if (typeof end == 'undefined') {
+ end = array ? array.length : 0;
+ }
+ var index = -1,
+ length = end - start || 0,
+ result = Array(length < 0 ? 0 : length);
+
+ while (++index < length) {
+ result[index] = array[start + index];
+ }
+ return result;
+ }
+
+ /**
+ * Used by `unescape` to convert HTML entities to characters.
+ *
+ * @private
+ * @param {String} match The matched character to unescape.
+ * @returns {String} Returns the unescaped character.
+ */
+ function unescapeHtmlChar(match) {
+ return htmlUnescapes[match];
+ }
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Checks if `value` is an `arguments` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`.
+ * @example
+ *
+ * (function() { return _.isArguments(arguments); })(1, 2, 3);
+ * // => true
+ *
+ * _.isArguments([1, 2, 3]);
+ * // => false
+ */
+ function isArguments(value) {
+ return toString.call(value) == argsClass;
+ }
+ // fallback for browsers that can't detect `arguments` objects by [[Class]]
+ if (noArgsClass) {
+ isArguments = function(value) {
+ return value ? hasOwnProperty.call(value, 'callee') : false;
+ };
+ }
+
+ /**
+ * Iterates over `object`'s own and inherited enumerable properties, executing
+ * the `callback` for each property. The `callback` is bound to `thisArg` and
+ * invoked with three arguments; (value, key, object). Callbacks may exit iteration
+ * early by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Objects
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [callback=identity] The function called per iteration.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * function Dog(name) {
+ * this.name = name;
+ * }
+ *
+ * Dog.prototype.bark = function() {
+ * alert('Woof, woof!');
+ * };
+ *
+ * _.forIn(new Dog('Dagny'), function(value, key) {
+ * alert(key);
+ * });
+ * // => alerts 'name' and 'bark' (order is not guaranteed)
+ */
+ var forIn = createIterator(eachIteratorOptions, forOwnIteratorOptions, {
+ 'useHas': false
+ });
+
+ /**
+ * Iterates over an object's own enumerable properties, executing the `callback`
+ * for each property. The `callback` is bound to `thisArg` and invoked with three
+ * arguments; (value, key, object). Callbacks may exit iteration early by explicitly
+ * returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Objects
+ * @param {Object} object The object to iterate over.
+ * @param {Function} [callback=identity] The function called per iteration.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
+ * alert(key);
+ * });
+ * // => alerts '0', '1', and 'length' (order is not guaranteed)
+ */
+ var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions);
+
+ /**
+ * Checks if `value` is an array.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`.
+ * @example
+ *
+ * (function() { return _.isArray(arguments); })();
+ * // => false
+ *
+ * _.isArray([1, 2, 3]);
+ * // => true
+ */
+ var isArray = nativeIsArray || function(value) {
+ // `instanceof` may cause a memory leak in IE 7 if `value` is a host object
+ // http://ajaxian.com/archives/working-aroung-the-instanceof-memory-leak
+ return (argsAreObjects && value instanceof Array) || toString.call(value) == arrayClass;
+ };
+
+ /**
+ * Creates an array composed of the own enumerable property names of `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns a new array of property names.
+ * @example
+ *
+ * _.keys({ 'one': 1, 'two': 2, 'three': 3 });
+ * // => ['one', 'two', 'three'] (order is not guaranteed)
+ */
+ var keys = !nativeKeys ? shimKeys : function(object) {
+ if (!isObject(object)) {
+ return [];
+ }
+ if ((hasEnumPrototype && typeof object == 'function') ||
+ (nonEnumArgs && object.length && isArguments(object))) {
+ return shimKeys(object);
+ }
+ return nativeKeys(object);
+ };
+
+ /**
+ * A fallback implementation of `isPlainObject` that checks if a given `value`
+ * is an object created by the `Object` constructor, assuming objects created
+ * by the `Object` constructor have no inherited enumerable properties and that
+ * there are no `Object.prototype` extensions.
+ *
+ * @private
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.
+ */
+ function shimIsPlainObject(value) {
+ // avoid non-objects and false positives for `arguments` objects
+ var result = false;
+ if (!(value && typeof value == 'object') || isArguments(value)) {
+ return result;
+ }
+ // check that the constructor is `Object` (i.e. `Object instanceof Object`)
+ var ctor = value.constructor;
+ if ((!isFunction(ctor) && (!noNodeClass || !isNode(value))) || ctor instanceof ctor) {
+ // IE < 9 iterates inherited properties before own properties. If the first
+ // iterated property is an object's own property then there are no inherited
+ // enumerable properties.
+ if (iteratesOwnLast) {
+ forIn(value, function(value, key, object) {
+ result = !hasOwnProperty.call(object, key);
+ return false;
+ });
+ return result === false;
+ }
+ // In most environments an object's own properties are iterated before
+ // its inherited properties. If the last iterated property is an object's
+ // own property then there are no inherited enumerable properties.
+ forIn(value, function(value, key) {
+ result = key;
+ });
+ return result === false || hasOwnProperty.call(value, result);
+ }
+ return result;
+ }
+
+ /**
+ * A fallback implementation of `Object.keys` that produces an array of the
+ * given object's own enumerable property names.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns a new array of property names.
+ */
+ function shimKeys(object) {
+ var result = [];
+ forOwn(object, function(value, key) {
+ result.push(key);
+ });
+ return result;
+ }
+
+ /**
+ * Used to convert characters to HTML entities:
+ *
+ * Though the `>` character is escaped for symmetry, characters like `>` and `/`
+ * don't require escaping in HTML and have no special meaning unless they're part
+ * of a tag or an unquoted attribute value.
+ * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
+ */
+ var htmlEscapes = {
+ '&': '&',
+ '<': '<',
+ '>': '>',
+ '"': '"',
+ "'": '''
+ };
+
+ /** Used to convert HTML entities to characters */
+ var htmlUnescapes = invert(htmlEscapes);
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Assigns own enumerable properties of source object(s) to the destination
+ * object. Subsequent sources will overwrite propery assignments of previous
+ * sources. If a `callback` function is passed, it will be executed to produce
+ * the assigned values. The `callback` is bound to `thisArg` and invoked with
+ * two arguments; (objectValue, sourceValue).
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @alias extend
+ * @category Objects
+ * @param {Object} object The destination object.
+ * @param {Object} [source1, source2, ...] The source objects.
+ * @param {Function} [callback] The function to customize assigning values.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Object} Returns the destination object.
+ * @example
+ *
+ * _.assign({ 'name': 'moe' }, { 'age': 40 });
+ * // => { 'name': 'moe', 'age': 40 }
+ *
+ * var defaults = _.partialRight(_.assign, function(a, b) {
+ * return typeof a == 'undefined' ? b : a;
+ * });
+ *
+ * var food = { 'name': 'apple' };
+ * defaults(food, { 'name': 'banana', 'type': 'fruit' });
+ * // => { 'name': 'apple', 'type': 'fruit' }
+ */
+ var assign = createIterator(defaultsIteratorOptions, {
+ 'top':
+ defaultsIteratorOptions.top.replace(';',
+ ';\n' +
+ "if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n" +
+ ' var callback = createCallback(args[--argsLength - 1], args[argsLength--], 2);\n' +
+ "} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n" +
+ ' callback = args[--argsLength];\n' +
+ '}'
+ ),
+ 'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]'
+ });
+
+ /**
+ * Creates a clone of `value`. If `deep` is `true`, nested objects will also
+ * be cloned, otherwise they will be assigned by reference. If a `callback`
+ * function is passed, it will be executed to produce the cloned values. If
+ * `callback` returns `undefined`, cloning will be handled by the method instead.
+ * The `callback` is bound to `thisArg` and invoked with one argument; (value).
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to clone.
+ * @param {Boolean} [deep=false] A flag to indicate a deep clone.
+ * @param {Function} [callback] The function to customize cloning values.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @param- {Array} [stackA=[]] Internally used to track traversed source objects.
+ * @param- {Array} [stackB=[]] Internally used to associate clones with source counterparts.
+ * @returns {Mixed} Returns the cloned `value`.
+ * @example
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * var shallow = _.clone(stooges);
+ * shallow[0] === stooges[0];
+ * // => true
+ *
+ * var deep = _.clone(stooges, true);
+ * deep[0] === stooges[0];
+ * // => false
+ *
+ * _.mixin({
+ * 'clone': _.partialRight(_.clone, function(value) {
+ * return _.isElement(value) ? value.cloneNode(false) : undefined;
+ * })
+ * });
+ *
+ * var clone = _.clone(document.body);
+ * clone.childNodes.length;
+ * // => 0
+ */
+ function clone(value, deep, callback, thisArg, stackA, stackB) {
+ var result = value;
+
+ // allows working with "Collections" methods without using their `callback`
+ // argument, `index|key`, for this method's `callback`
+ if (typeof deep == 'function') {
+ thisArg = callback;
+ callback = deep;
+ deep = false;
+ }
+ if (typeof callback == 'function') {
+ callback = typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg, 1);
+ result = callback(result);
+
+ var done = typeof result != 'undefined';
+ if (!done) {
+ result = value;
+ }
+ }
+ // inspect [[Class]]
+ var isObj = isObject(result);
+ if (isObj) {
+ var className = toString.call(result);
+ if (!cloneableClasses[className] || (noNodeClass && isNode(result))) {
+ return result;
+ }
+ var isArr = isArray(result);
+ }
+ // shallow clone
+ if (!isObj || !deep) {
+ return isObj && !done
+ ? (isArr ? slice(result) : assign({}, result))
+ : result;
+ }
+ var ctor = ctorByClass[className];
+ switch (className) {
+ case boolClass:
+ case dateClass:
+ return done ? result : new ctor(+result);
+
+ case numberClass:
+ case stringClass:
+ return done ? result : new ctor(result);
+
+ case regexpClass:
+ return done ? result : ctor(result.source, reFlags.exec(result));
+ }
+ // check for circular references and return corresponding clone
+ stackA || (stackA = []);
+ stackB || (stackB = []);
+
+ var length = stackA.length;
+ while (length--) {
+ if (stackA[length] == value) {
+ return stackB[length];
+ }
+ }
+ // init cloned object
+ if (!done) {
+ result = isArr ? ctor(result.length) : {};
+
+ // add array properties assigned by `RegExp#exec`
+ if (isArr) {
+ if (hasOwnProperty.call(value, 'index')) {
+ result.index = value.index;
+ }
+ if (hasOwnProperty.call(value, 'input')) {
+ result.input = value.input;
+ }
+ }
+ }
+ // add the source value to the stack of traversed objects
+ // and associate it with its clone
+ stackA.push(value);
+ stackB.push(result);
+
+ // recursively populate clone (susceptible to call stack limits)
+ (isArr ? forEach : forOwn)(done ? result : value, function(objValue, key) {
+ result[key] = clone(objValue, deep, callback, undefined, stackA, stackB);
+ });
+
+ return result;
+ }
+
+ /**
+ * Creates a deep clone of `value`. If a `callback` function is passed, it will
+ * be executed to produce the cloned values. If `callback` returns the value it
+ * was passed, cloning will be handled by the method instead. The `callback` is
+ * bound to `thisArg` and invoked with one argument; (value).
+ *
+ * Note: This function is loosely based on the structured clone algorithm. Functions
+ * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
+ * objects created by constructors other than `Object` are cloned to plain `Object` objects.
+ * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to deep clone.
+ * @param {Function} [callback] The function to customize cloning values.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the deep cloned `value`.
+ * @example
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * var deep = _.cloneDeep(stooges);
+ * deep[0] === stooges[0];
+ * // => false
+ *
+ * var view = {
+ * 'label': 'docs',
+ * 'node': element
+ * };
+ *
+ * var clone = _.cloneDeep(view, function(value) {
+ * return _.isElement(value) ? value.cloneNode(true) : value;
+ * });
+ *
+ * clone.node == view.node;
+ * // => false
+ */
+ function cloneDeep(value, callback, thisArg) {
+ return clone(value, true, callback, thisArg);
+ }
+
+ /**
+ * Assigns own enumerable properties of source object(s) to the destination
+ * object for all destination properties that resolve to `undefined`. Once a
+ * property is set, additional defaults of the same property will be ignored.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Objects
+ * @param {Object} object The destination object.
+ * @param {Object} [source1, source2, ...] The source objects.
+ * @param- {Object} [guard] Internally used to allow working with `_.reduce`
+ * without using its callback's `key` and `object` arguments as sources.
+ * @returns {Object} Returns the destination object.
+ * @example
+ *
+ * var food = { 'name': 'apple' };
+ * _.defaults(food, { 'name': 'banana', 'type': 'fruit' });
+ * // => { 'name': 'apple', 'type': 'fruit' }
+ */
+ var defaults = createIterator(defaultsIteratorOptions);
+
+ /**
+ * Creates a sorted array of all enumerable properties, own and inherited,
+ * of `object` that have function values.
+ *
+ * @static
+ * @memberOf _
+ * @alias methods
+ * @category Objects
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns a new array of property names that have function values.
+ * @example
+ *
+ * _.functions(_);
+ * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
+ */
+ function functions(object) {
+ var result = [];
+ forIn(object, function(value, key) {
+ if (isFunction(value)) {
+ result.push(key);
+ }
+ });
+ return result.sort();
+ }
+
+ /**
+ * Checks if the specified object `property` exists and is a direct property,
+ * instead of an inherited property.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The object to check.
+ * @param {String} property The property to check for.
+ * @returns {Boolean} Returns `true` if key is a direct property, else `false`.
+ * @example
+ *
+ * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
+ * // => true
+ */
+ function has(object, property) {
+ return object ? hasOwnProperty.call(object, property) : false;
+ }
+
+ /**
+ * Creates an object composed of the inverted keys and values of the given `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The object to invert.
+ * @returns {Object} Returns the created inverted object.
+ * @example
+ *
+ * _.invert({ 'first': 'moe', 'second': 'larry' });
+ * // => { 'moe': 'first', 'larry': 'second' } (order is not guaranteed)
+ */
+ function invert(object) {
+ var index = -1,
+ props = keys(object),
+ length = props.length,
+ result = {};
+
+ while (++index < length) {
+ var key = props[index];
+ result[object[key]] = key;
+ }
+ return result;
+ }
+
+ /**
+ * Checks if `value` is a boolean value.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is a boolean value, else `false`.
+ * @example
+ *
+ * _.isBoolean(null);
+ * // => false
+ */
+ function isBoolean(value) {
+ return value === true || value === false || toString.call(value) == boolClass;
+ }
+
+ /**
+ * Checks if `value` is a date.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is a date, else `false`.
+ * @example
+ *
+ * _.isDate(new Date);
+ * // => true
+ */
+ function isDate(value) {
+ return value instanceof Date || toString.call(value) == dateClass;
+ }
+
+ /**
+ * Checks if `value` is a DOM element.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is a DOM element, else `false`.
+ * @example
+ *
+ * _.isElement(document.body);
+ * // => true
+ */
+ function isElement(value) {
+ return value ? value.nodeType === 1 : false;
+ }
+
+ /**
+ * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a
+ * length of `0` and objects with no own enumerable properties are considered
+ * "empty".
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Array|Object|String} value The value to inspect.
+ * @returns {Boolean} Returns `true`, if the `value` is empty, else `false`.
+ * @example
+ *
+ * _.isEmpty([1, 2, 3]);
+ * // => false
+ *
+ * _.isEmpty({});
+ * // => true
+ *
+ * _.isEmpty('');
+ * // => true
+ */
+ function isEmpty(value) {
+ var result = true;
+ if (!value) {
+ return result;
+ }
+ var className = toString.call(value),
+ length = value.length;
+
+ if ((className == arrayClass || className == stringClass ||
+ className == argsClass || (noArgsClass && isArguments(value))) ||
+ (className == objectClass && typeof length == 'number' && isFunction(value.splice))) {
+ return !length;
+ }
+ forOwn(value, function() {
+ return (result = false);
+ });
+ return result;
+ }
+
+ /**
+ * Performs a deep comparison between two values to determine if they are
+ * equivalent to each other. If `callback` is passed, it will be executed to
+ * compare values. If `callback` returns `undefined`, comparisons will be handled
+ * by the method instead. The `callback` is bound to `thisArg` and invoked with
+ * two arguments; (a, b).
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} a The value to compare.
+ * @param {Mixed} b The other value to compare.
+ * @param {Function} [callback] The function to customize comparing values.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @param- {Object} [stackA=[]] Internally used track traversed `a` objects.
+ * @param- {Object} [stackB=[]] Internally used track traversed `b` objects.
+ * @returns {Boolean} Returns `true`, if the values are equvalent, else `false`.
+ * @example
+ *
+ * var moe = { 'name': 'moe', 'age': 40 };
+ * var copy = { 'name': 'moe', 'age': 40 };
+ *
+ * moe == copy;
+ * // => false
+ *
+ * _.isEqual(moe, copy);
+ * // => true
+ *
+ * var words = ['hello', 'goodbye'];
+ * var otherWords = ['hi', 'goodbye'];
+ *
+ * _.isEqual(words, otherWords, function(a, b) {
+ * var reGreet = /^(?:hello|hi)$/i,
+ * aGreet = _.isString(a) && reGreet.test(a),
+ * bGreet = _.isString(b) && reGreet.test(b);
+ *
+ * return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
+ * });
+ * // => true
+ */
+ function isEqual(a, b, callback, thisArg, stackA, stackB) {
+ // used to indicate that when comparing objects, `a` has at least the properties of `b`
+ var whereIndicator = callback === indicatorObject;
+ if (callback && !whereIndicator) {
+ callback = typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg, 2);
+ var result = callback(a, b);
+ if (typeof result != 'undefined') {
+ return !!result;
+ }
+ }
+ // exit early for identical values
+ if (a === b) {
+ // treat `+0` vs. `-0` as not equal
+ return a !== 0 || (1 / a == 1 / b);
+ }
+ var type = typeof a,
+ otherType = typeof b;
+
+ // exit early for unlike primitive values
+ if (a === a &&
+ (!a || (type != 'function' && type != 'object')) &&
+ (!b || (otherType != 'function' && otherType != 'object'))) {
+ return false;
+ }
+ // exit early for `null` and `undefined`, avoiding ES3's Function#call behavior
+ // http://es5.github.com/#x15.3.4.4
+ if (a == null || b == null) {
+ return a === b;
+ }
+ // compare [[Class]] names
+ var className = toString.call(a),
+ otherClass = toString.call(b);
+
+ if (className == argsClass) {
+ className = objectClass;
+ }
+ if (otherClass == argsClass) {
+ otherClass = objectClass;
+ }
+ if (className != otherClass) {
+ return false;
+ }
+ switch (className) {
+ case boolClass:
+ case dateClass:
+ // coerce dates and booleans to numbers, dates to milliseconds and booleans
+ // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal
+ return +a == +b;
+
+ case numberClass:
+ // treat `NaN` vs. `NaN` as equal
+ return a != +a
+ ? b != +b
+ // but treat `+0` vs. `-0` as not equal
+ : (a == 0 ? (1 / a == 1 / b) : a == +b);
+
+ case regexpClass:
+ case stringClass:
+ // coerce regexes to strings (http://es5.github.com/#x15.10.6.4)
+ // treat string primitives and their corresponding object instances as equal
+ return a == b + '';
+ }
+ var isArr = className == arrayClass;
+ if (!isArr) {
+ // unwrap any `lodash` wrapped values
+ if (a.__wrapped__ || b.__wrapped__) {
+ return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, callback, thisArg, stackA, stackB);
+ }
+ // exit for functions and DOM nodes
+ if (className != objectClass || (noNodeClass && (isNode(a) || isNode(b)))) {
+ return false;
+ }
+ // in older versions of Opera, `arguments` objects have `Array` constructors
+ var ctorA = !argsAreObjects && isArguments(a) ? Object : a.constructor,
+ ctorB = !argsAreObjects && isArguments(b) ? Object : b.constructor;
+
+ // non `Object` object instances with different constructors are not equal
+ if (ctorA != ctorB && !(
+ isFunction(ctorA) && ctorA instanceof ctorA &&
+ isFunction(ctorB) && ctorB instanceof ctorB
+ )) {
+ return false;
+ }
+ }
+ // assume cyclic structures are equal
+ // the algorithm for detecting cyclic structures is adapted from ES 5.1
+ // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3)
+ stackA || (stackA = []);
+ stackB || (stackB = []);
+
+ var length = stackA.length;
+ while (length--) {
+ if (stackA[length] == a) {
+ return stackB[length] == b;
+ }
+ }
+ var size = 0;
+ result = true;
+
+ // add `a` and `b` to the stack of traversed objects
+ stackA.push(a);
+ stackB.push(b);
+
+ // recursively compare objects and arrays (susceptible to call stack limits)
+ if (isArr) {
+ length = a.length;
+ size = b.length;
+
+ // compare lengths to determine if a deep comparison is necessary
+ result = size == a.length;
+ if (!result && !whereIndicator) {
+ return result;
+ }
+ // deep compare the contents, ignoring non-numeric properties
+ while (size--) {
+ var index = length,
+ value = b[size];
+
+ if (whereIndicator) {
+ while (index--) {
+ if ((result = isEqual(a[index], value, callback, thisArg, stackA, stackB))) {
+ break;
+ }
+ }
+ } else if (!(result = isEqual(a[size], value, callback, thisArg, stackA, stackB))) {
break;
}
}
return result;
- };
- }
- if (typeof thisArg != 'undefined') {
- if (argCount === 1) {
- return function(value) {
- return func.call(thisArg, value);
- };
}
- if (argCount === 2) {
- return function(a, b) {
- return func.call(thisArg, a, b);
- };
- }
- if (argCount === 4) {
- return function(accumulator, value, index, object) {
- return func.call(thisArg, accumulator, value, index, object);
- };
- }
- return function(value, index, object) {
- return func.call(thisArg, value, index, object);
- };
- }
- return func;
- }
+ // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys`
+ // which, in this case, is more costly
+ forIn(b, function(value, key, b) {
+ if (hasOwnProperty.call(b, key)) {
+ // count the number of properties.
+ size++;
+ // deep compare each property value.
+ return (result = hasOwnProperty.call(a, key) && isEqual(a[key], value, callback, thisArg, stackA, stackB));
+ }
+ });
- /**
- * Creates compiled iteration functions.
- *
- * @private
- * @param {Object} [options1, options2, ...] The compile options object(s).
- * arrays - A string of code to determine if the iterable is an array or array-like.
- * useHas - A boolean to specify using `hasOwnProperty` checks in the object loop.
- * args - A string of comma separated arguments the iteration function will accept.
- * top - A string of code to execute before the iteration branches.
- * loop - A string of code to execute in the object loop.
- * bottom - A string of code to execute after the iteration branches.
- *
- * @returns {Function} Returns the compiled function.
- */
- function createIterator() {
- var data = {
- // support properties
- 'hasDontEnumBug': hasDontEnumBug,
- 'hasEnumPrototype': hasEnumPrototype,
- 'isKeysFast': isKeysFast,
- 'nonEnumArgs': nonEnumArgs,
- 'noCharByIndex': noCharByIndex,
- 'shadowed': shadowed,
-
- // iterator options
- 'arrays': 'isArray(iterable)',
- 'bottom': '',
- 'loop': '',
- 'top': '',
- 'useHas': true
- };
-
- // merge options into a template data object
- for (var object, index = 0; object = arguments[index]; index++) {
- for (var key in object) {
- data[key] = object[key];
- }
- }
- var args = data.args;
- data.firstArg = /^[^,]+/.exec(args)[0];
-
- // create the function factory
- var factory = Function(
- 'createCallback, hasOwnProperty, isArguments, isArray, isString, ' +
- 'objectTypes, nativeKeys',
- 'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
- );
- // return the compiled function
- return factory(
- createCallback, hasOwnProperty, isArguments, isArray, isString,
- objectTypes, nativeKeys
- );
- }
-
- /**
- * A function compiled to iterate `arguments` objects, arrays, objects, and
- * strings consistenly across environments, executing the `callback` for each
- * element in the `collection`. The `callback` is bound to `thisArg` and invoked
- * with three arguments; (value, index|key, collection). Callbacks may exit
- * iteration early by explicitly returning `false`.
- *
- * @private
- * @type Function
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array|Object|String} Returns `collection`.
- */
- var each = createIterator(eachIteratorOptions);
-
- /**
- * Used by `template` to escape characters for inclusion in compiled
- * string literals.
- *
- * @private
- * @param {String} match The matched character to escape.
- * @returns {String} Returns the escaped character.
- */
- function escapeStringChar(match) {
- return '\\' + stringEscapes[match];
- }
-
- /**
- * Used by `escape` to convert characters to HTML entities.
- *
- * @private
- * @param {String} match The matched character to escape.
- * @returns {String} Returns the escaped character.
- */
- function escapeHtmlChar(match) {
- return htmlEscapes[match];
- }
-
- /**
- * Checks if `value` is a DOM node in IE < 9.
- *
- * @private
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true` if the `value` is a DOM node, else `false`.
- */
- function isNode(value) {
- // IE < 9 presents DOM nodes as `Object` objects except they have `toString`
- // methods that are `typeof` "string" and still can coerce nodes to strings
- return typeof value.toString != 'function' && typeof (value + '') == 'string';
- }
-
- /**
- * A no-operation function.
- *
- * @private
- */
- function noop() {
- // no operation performed
- }
-
- /**
- * Slices the `collection` from the `start` index up to, but not including,
- * the `end` index.
- *
- * Note: This function is used, instead of `Array#slice`, to support node lists
- * in IE < 9 and to ensure dense arrays are returned.
- *
- * @private
- * @param {Array|Object|String} collection The collection to slice.
- * @param {Number} start The start index.
- * @param {Number} end The end index.
- * @returns {Array} Returns the new array.
- */
- function slice(array, start, end) {
- start || (start = 0);
- if (typeof end == 'undefined') {
- end = array ? array.length : 0;
- }
- var index = -1,
- length = end - start || 0,
- result = Array(length < 0 ? 0 : length);
-
- while (++index < length) {
- result[index] = array[start + index];
- }
- return result;
- }
-
- /**
- * Used by `unescape` to convert HTML entities to characters.
- *
- * @private
- * @param {String} match The matched character to unescape.
- * @returns {String} Returns the unescaped character.
- */
- function unescapeHtmlChar(match) {
- return htmlUnescapes[match];
- }
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Checks if `value` is an `arguments` object.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`.
- * @example
- *
- * (function() { return _.isArguments(arguments); })(1, 2, 3);
- * // => true
- *
- * _.isArguments([1, 2, 3]);
- * // => false
- */
- function isArguments(value) {
- return toString.call(value) == argsClass;
- }
- // fallback for browsers that can't detect `arguments` objects by [[Class]]
- if (noArgsClass) {
- isArguments = function(value) {
- return value ? hasOwnProperty.call(value, 'callee') : false;
- };
- }
-
- /**
- * Iterates over `object`'s own and inherited enumerable properties, executing
- * the `callback` for each property. The `callback` is bound to `thisArg` and
- * invoked with three arguments; (value, key, object). Callbacks may exit iteration
- * early by explicitly returning `false`.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Objects
- * @param {Object} object The object to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns `object`.
- * @example
- *
- * function Dog(name) {
- * this.name = name;
- * }
- *
- * Dog.prototype.bark = function() {
- * alert('Woof, woof!');
- * };
- *
- * _.forIn(new Dog('Dagny'), function(value, key) {
- * alert(key);
- * });
- * // => alerts 'name' and 'bark' (order is not guaranteed)
- */
- var forIn = createIterator(eachIteratorOptions, forOwnIteratorOptions, {
- 'useHas': false
- });
-
- /**
- * Iterates over an object's own enumerable properties, executing the `callback`
- * for each property. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, key, object). Callbacks may exit iteration early by explicitly
- * returning `false`.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Objects
- * @param {Object} object The object to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns `object`.
- * @example
- *
- * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
- * alert(key);
- * });
- * // => alerts '0', '1', and 'length' (order is not guaranteed)
- */
- var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions);
-
- /**
- * Checks if `value` is an array.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`.
- * @example
- *
- * (function() { return _.isArray(arguments); })();
- * // => false
- *
- * _.isArray([1, 2, 3]);
- * // => true
- */
- var isArray = nativeIsArray || function(value) {
- // `instanceof` may cause a memory leak in IE 7 if `value` is a host object
- // http://ajaxian.com/archives/working-aroung-the-instanceof-memory-leak
- return (argsAreObjects && value instanceof Array) || toString.call(value) == arrayClass;
- };
-
- /**
- * Creates an array composed of the own enumerable property names of `object`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property names.
- * @example
- *
- * _.keys({ 'one': 1, 'two': 2, 'three': 3 });
- * // => ['one', 'two', 'three'] (order is not guaranteed)
- */
- var keys = !nativeKeys ? shimKeys : function(object) {
- if (!isObject(object)) {
- return [];
- }
- if ((hasEnumPrototype && typeof object == 'function') ||
- (nonEnumArgs && object.length && isArguments(object))) {
- return shimKeys(object);
- }
- return nativeKeys(object);
- };
-
- /**
- * A fallback implementation of `isPlainObject` that checks if a given `value`
- * is an object created by the `Object` constructor, assuming objects created
- * by the `Object` constructor have no inherited enumerable properties and that
- * there are no `Object.prototype` extensions.
- *
- * @private
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.
- */
- function shimIsPlainObject(value) {
- // avoid non-objects and false positives for `arguments` objects
- var result = false;
- if (!(value && typeof value == 'object') || isArguments(value)) {
- return result;
- }
- // check that the constructor is `Object` (i.e. `Object instanceof Object`)
- var ctor = value.constructor;
- if ((!isFunction(ctor) && (!noNodeClass || !isNode(value))) || ctor instanceof ctor) {
- // IE < 9 iterates inherited properties before own properties. If the first
- // iterated property is an object's own property then there are no inherited
- // enumerable properties.
- if (iteratesOwnLast) {
- forIn(value, function(value, key, object) {
- result = !hasOwnProperty.call(object, key);
- return false;
+ if (result && !whereIndicator) {
+ // ensure both objects have the same number of properties
+ forIn(a, function(value, key, a) {
+ if (hasOwnProperty.call(a, key)) {
+ // `size` will be `-1` if `a` has more properties than `b`
+ return (result = --size > -1);
+ }
});
- return result === false;
- }
- // In most environments an object's own properties are iterated before
- // its inherited properties. If the last iterated property is an object's
- // own property then there are no inherited enumerable properties.
- forIn(value, function(value, key) {
- result = key;
- });
- return result === false || hasOwnProperty.call(value, result);
- }
- return result;
- }
-
- /**
- * A fallback implementation of `Object.keys` that produces an array of the
- * given object's own enumerable property names.
- *
- * @private
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property names.
- */
- function shimKeys(object) {
- var result = [];
- forOwn(object, function(value, key) {
- result.push(key);
- });
- return result;
- }
-
- /**
- * Used to convert characters to HTML entities:
- *
- * Though the `>` character is escaped for symmetry, characters like `>` and `/`
- * don't require escaping in HTML and have no special meaning unless they're part
- * of a tag or an unquoted attribute value.
- * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
- */
- var htmlEscapes = {
- '&': '&',
- '<': '<',
- '>': '>',
- '"': '"',
- "'": '''
- };
-
- /** Used to convert HTML entities to characters */
- var htmlUnescapes = invert(htmlEscapes);
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Assigns own enumerable properties of source object(s) to the destination
- * object. Subsequent sources will overwrite propery assignments of previous
- * sources. If a `callback` function is passed, it will be executed to produce
- * the assigned values. The `callback` is bound to `thisArg` and invoked with
- * two arguments; (objectValue, sourceValue).
- *
- * @static
- * @memberOf _
- * @type Function
- * @alias extend
- * @category Objects
- * @param {Object} object The destination object.
- * @param {Object} [source1, source2, ...] The source objects.
- * @param {Function} [callback] The function to customize assigning values.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns the destination object.
- * @example
- *
- * _.assign({ 'name': 'moe' }, { 'age': 40 });
- * // => { 'name': 'moe', 'age': 40 }
- *
- * var defaults = _.partialRight(_.assign, function(a, b) {
- * return typeof a == 'undefined' ? b : a;
- * });
- *
- * var food = { 'name': 'apple' };
- * defaults(food, { 'name': 'banana', 'type': 'fruit' });
- * // => { 'name': 'apple', 'type': 'fruit' }
- */
- var assign = createIterator(defaultsIteratorOptions, {
- 'top':
- defaultsIteratorOptions.top.replace(';',
- ';\n' +
- "if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n" +
- ' var callback = createCallback(args[--argsLength - 1], args[argsLength--], 2);\n' +
- "} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n" +
- ' callback = args[--argsLength];\n' +
- '}'
- ),
- 'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]'
- });
-
- /**
- * Creates a clone of `value`. If `deep` is `true`, nested objects will also
- * be cloned, otherwise they will be assigned by reference. If a `callback`
- * function is passed, it will be executed to produce the cloned values. If
- * `callback` returns `undefined`, cloning will be handled by the method instead.
- * The `callback` is bound to `thisArg` and invoked with one argument; (value).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to clone.
- * @param {Boolean} [deep=false] A flag to indicate a deep clone.
- * @param {Function} [callback] The function to customize cloning values.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @param- {Array} [stackA=[]] Internally used to track traversed source objects.
- * @param- {Array} [stackB=[]] Internally used to associate clones with source counterparts.
- * @returns {Mixed} Returns the cloned `value`.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * var shallow = _.clone(stooges);
- * shallow[0] === stooges[0];
- * // => true
- *
- * var deep = _.clone(stooges, true);
- * deep[0] === stooges[0];
- * // => false
- *
- * _.mixin({
- * 'clone': _.partialRight(_.clone, function(value) {
- * return _.isElement(value) ? value.cloneNode(false) : undefined;
- * })
- * });
- *
- * var clone = _.clone(document.body);
- * clone.childNodes.length;
- * // => 0
- */
- function clone(value, deep, callback, thisArg, stackA, stackB) {
- var result = value;
-
- // allows working with "Collections" methods without using their `callback`
- // argument, `index|key`, for this method's `callback`
- if (typeof deep == 'function') {
- thisArg = callback;
- callback = deep;
- deep = false;
- }
- if (typeof callback == 'function') {
- callback = typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg, 1);
- result = callback(result);
-
- var done = typeof result != 'undefined';
- if (!done) {
- result = value;
- }
- }
- // inspect [[Class]]
- var isObj = isObject(result);
- if (isObj) {
- var className = toString.call(result);
- if (!cloneableClasses[className] || (noNodeClass && isNode(result))) {
- return result;
- }
- var isArr = isArray(result);
- }
- // shallow clone
- if (!isObj || !deep) {
- return isObj && !done
- ? (isArr ? slice(result) : assign({}, result))
- : result;
- }
- var ctor = ctorByClass[className];
- switch (className) {
- case boolClass:
- case dateClass:
- return done ? result : new ctor(+result);
-
- case numberClass:
- case stringClass:
- return done ? result : new ctor(result);
-
- case regexpClass:
- return done ? result : ctor(result.source, reFlags.exec(result));
- }
- // check for circular references and return corresponding clone
- stackA || (stackA = []);
- stackB || (stackB = []);
-
- var length = stackA.length;
- while (length--) {
- if (stackA[length] == value) {
- return stackB[length];
- }
- }
- // init cloned object
- if (!done) {
- result = isArr ? ctor(result.length) : {};
-
- // add array properties assigned by `RegExp#exec`
- if (isArr) {
- if (hasOwnProperty.call(value, 'index')) {
- result.index = value.index;
- }
- if (hasOwnProperty.call(value, 'input')) {
- result.input = value.input;
- }
- }
- }
- // add the source value to the stack of traversed objects
- // and associate it with its clone
- stackA.push(value);
- stackB.push(result);
-
- // recursively populate clone (susceptible to call stack limits)
- (isArr ? forEach : forOwn)(done ? result : value, function(objValue, key) {
- result[key] = clone(objValue, deep, callback, undefined, stackA, stackB);
- });
-
- return result;
- }
-
- /**
- * Creates a deep clone of `value`. If a `callback` function is passed, it will
- * be executed to produce the cloned values. If `callback` returns the value it
- * was passed, cloning will be handled by the method instead. The `callback` is
- * bound to `thisArg` and invoked with one argument; (value).
- *
- * Note: This function is loosely based on the structured clone algorithm. Functions
- * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
- * objects created by constructors other than `Object` are cloned to plain `Object` objects.
- * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to deep clone.
- * @param {Function} [callback] The function to customize cloning values.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the deep cloned `value`.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * var deep = _.cloneDeep(stooges);
- * deep[0] === stooges[0];
- * // => false
- *
- * var view = {
- * 'label': 'docs',
- * 'node': element
- * };
- *
- * var clone = _.cloneDeep(view, function(value) {
- * return _.isElement(value) ? value.cloneNode(true) : value;
- * });
- *
- * clone.node == view.node;
- * // => false
- */
- function cloneDeep(value, callback, thisArg) {
- return clone(value, true, callback, thisArg);
- }
-
- /**
- * Assigns own enumerable properties of source object(s) to the destination
- * object for all destination properties that resolve to `undefined`. Once a
- * property is set, additional defaults of the same property will be ignored.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Objects
- * @param {Object} object The destination object.
- * @param {Object} [source1, source2, ...] The source objects.
- * @param- {Object} [guard] Internally used to allow working with `_.reduce`
- * without using its callback's `key` and `object` arguments as sources.
- * @returns {Object} Returns the destination object.
- * @example
- *
- * var food = { 'name': 'apple' };
- * _.defaults(food, { 'name': 'banana', 'type': 'fruit' });
- * // => { 'name': 'apple', 'type': 'fruit' }
- */
- var defaults = createIterator(defaultsIteratorOptions);
-
- /**
- * Creates a sorted array of all enumerable properties, own and inherited,
- * of `object` that have function values.
- *
- * @static
- * @memberOf _
- * @alias methods
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property names that have function values.
- * @example
- *
- * _.functions(_);
- * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
- */
- function functions(object) {
- var result = [];
- forIn(object, function(value, key) {
- if (isFunction(value)) {
- result.push(key);
- }
- });
- return result.sort();
- }
-
- /**
- * Checks if the specified object `property` exists and is a direct property,
- * instead of an inherited property.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to check.
- * @param {String} property The property to check for.
- * @returns {Boolean} Returns `true` if key is a direct property, else `false`.
- * @example
- *
- * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
- * // => true
- */
- function has(object, property) {
- return object ? hasOwnProperty.call(object, property) : false;
- }
-
- /**
- * Creates an object composed of the inverted keys and values of the given `object`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to invert.
- * @returns {Object} Returns the created inverted object.
- * @example
- *
- * _.invert({ 'first': 'moe', 'second': 'larry' });
- * // => { 'moe': 'first', 'larry': 'second' } (order is not guaranteed)
- */
- function invert(object) {
- var index = -1,
- props = keys(object),
- length = props.length,
- result = {};
-
- while (++index < length) {
- var key = props[index];
- result[object[key]] = key;
- }
- return result;
- }
-
- /**
- * Checks if `value` is a boolean value.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is a boolean value, else `false`.
- * @example
- *
- * _.isBoolean(null);
- * // => false
- */
- function isBoolean(value) {
- return value === true || value === false || toString.call(value) == boolClass;
- }
-
- /**
- * Checks if `value` is a date.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is a date, else `false`.
- * @example
- *
- * _.isDate(new Date);
- * // => true
- */
- function isDate(value) {
- return value instanceof Date || toString.call(value) == dateClass;
- }
-
- /**
- * Checks if `value` is a DOM element.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is a DOM element, else `false`.
- * @example
- *
- * _.isElement(document.body);
- * // => true
- */
- function isElement(value) {
- return value ? value.nodeType === 1 : false;
- }
-
- /**
- * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a
- * length of `0` and objects with no own enumerable properties are considered
- * "empty".
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Array|Object|String} value The value to inspect.
- * @returns {Boolean} Returns `true`, if the `value` is empty, else `false`.
- * @example
- *
- * _.isEmpty([1, 2, 3]);
- * // => false
- *
- * _.isEmpty({});
- * // => true
- *
- * _.isEmpty('');
- * // => true
- */
- function isEmpty(value) {
- var result = true;
- if (!value) {
- return result;
- }
- var className = toString.call(value),
- length = value.length;
-
- if ((className == arrayClass || className == stringClass ||
- className == argsClass || (noArgsClass && isArguments(value))) ||
- (className == objectClass && typeof length == 'number' && isFunction(value.splice))) {
- return !length;
- }
- forOwn(value, function() {
- return (result = false);
- });
- return result;
- }
-
- /**
- * Performs a deep comparison between two values to determine if they are
- * equivalent to each other. If `callback` is passed, it will be executed to
- * compare values. If `callback` returns `undefined`, comparisons will be handled
- * by the method instead. The `callback` is bound to `thisArg` and invoked with
- * two arguments; (a, b).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} a The value to compare.
- * @param {Mixed} b The other value to compare.
- * @param {Function} [callback] The function to customize comparing values.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @param- {Object} [stackA=[]] Internally used track traversed `a` objects.
- * @param- {Object} [stackB=[]] Internally used track traversed `b` objects.
- * @returns {Boolean} Returns `true`, if the values are equvalent, else `false`.
- * @example
- *
- * var moe = { 'name': 'moe', 'age': 40 };
- * var copy = { 'name': 'moe', 'age': 40 };
- *
- * moe == copy;
- * // => false
- *
- * _.isEqual(moe, copy);
- * // => true
- *
- * var words = ['hello', 'goodbye'];
- * var otherWords = ['hi', 'goodbye'];
- *
- * _.isEqual(words, otherWords, function(a, b) {
- * var reGreet = /^(?:hello|hi)$/i,
- * aGreet = _.isString(a) && reGreet.test(a),
- * bGreet = _.isString(b) && reGreet.test(b);
- *
- * return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
- * });
- * // => true
- */
- function isEqual(a, b, callback, thisArg, stackA, stackB) {
- // used to indicate that when comparing objects, `a` has at least the properties of `b`
- var whereIndicator = callback === indicatorObject;
- if (callback && !whereIndicator) {
- callback = typeof thisArg == 'undefined' ? callback : createCallback(callback, thisArg, 2);
- var result = callback(a, b);
- if (typeof result != 'undefined') {
- return !!result;
- }
- }
- // exit early for identical values
- if (a === b) {
- // treat `+0` vs. `-0` as not equal
- return a !== 0 || (1 / a == 1 / b);
- }
- var type = typeof a,
- otherType = typeof b;
-
- // exit early for unlike primitive values
- if (a === a &&
- (!a || (type != 'function' && type != 'object')) &&
- (!b || (otherType != 'function' && otherType != 'object'))) {
- return false;
- }
- // exit early for `null` and `undefined`, avoiding ES3's Function#call behavior
- // http://es5.github.com/#x15.3.4.4
- if (a == null || b == null) {
- return a === b;
- }
- // compare [[Class]] names
- var className = toString.call(a),
- otherClass = toString.call(b);
-
- if (className == argsClass) {
- className = objectClass;
- }
- if (otherClass == argsClass) {
- otherClass = objectClass;
- }
- if (className != otherClass) {
- return false;
- }
- switch (className) {
- case boolClass:
- case dateClass:
- // coerce dates and booleans to numbers, dates to milliseconds and booleans
- // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal
- return +a == +b;
-
- case numberClass:
- // treat `NaN` vs. `NaN` as equal
- return a != +a
- ? b != +b
- // but treat `+0` vs. `-0` as not equal
- : (a == 0 ? (1 / a == 1 / b) : a == +b);
-
- case regexpClass:
- case stringClass:
- // coerce regexes to strings (http://es5.github.com/#x15.10.6.4)
- // treat string primitives and their corresponding object instances as equal
- return a == b + '';
- }
- var isArr = className == arrayClass;
- if (!isArr) {
- // unwrap any `lodash` wrapped values
- if (a.__wrapped__ || b.__wrapped__) {
- return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, callback, thisArg, stackA, stackB);
- }
- // exit for functions and DOM nodes
- if (className != objectClass || (noNodeClass && (isNode(a) || isNode(b)))) {
- return false;
- }
- // in older versions of Opera, `arguments` objects have `Array` constructors
- var ctorA = !argsAreObjects && isArguments(a) ? Object : a.constructor,
- ctorB = !argsAreObjects && isArguments(b) ? Object : b.constructor;
-
- // non `Object` object instances with different constructors are not equal
- if (ctorA != ctorB && !(
- isFunction(ctorA) && ctorA instanceof ctorA &&
- isFunction(ctorB) && ctorB instanceof ctorB
- )) {
- return false;
- }
- }
- // assume cyclic structures are equal
- // the algorithm for detecting cyclic structures is adapted from ES 5.1
- // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3)
- stackA || (stackA = []);
- stackB || (stackB = []);
-
- var length = stackA.length;
- while (length--) {
- if (stackA[length] == a) {
- return stackB[length] == b;
- }
- }
- var size = 0;
- result = true;
-
- // add `a` and `b` to the stack of traversed objects
- stackA.push(a);
- stackB.push(b);
-
- // recursively compare objects and arrays (susceptible to call stack limits)
- if (isArr) {
- length = a.length;
- size = b.length;
-
- // compare lengths to determine if a deep comparison is necessary
- result = size == a.length;
- if (!result && !whereIndicator) {
- return result;
- }
- // deep compare the contents, ignoring non-numeric properties
- while (size--) {
- var index = length,
- value = b[size];
-
- if (whereIndicator) {
- while (index--) {
- if ((result = isEqual(a[index], value, callback, thisArg, stackA, stackB))) {
- break;
- }
- }
- } else if (!(result = isEqual(a[size], value, callback, thisArg, stackA, stackB))) {
- break;
- }
}
return result;
}
- // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys`
- // which, in this case, is more costly
- forIn(b, function(value, key, b) {
- if (hasOwnProperty.call(b, key)) {
- // count the number of properties.
- size++;
- // deep compare each property value.
- return (result = hasOwnProperty.call(a, key) && isEqual(a[key], value, callback, thisArg, stackA, stackB));
- }
- });
- if (result && !whereIndicator) {
- // ensure both objects have the same number of properties
- forIn(a, function(value, key, a) {
- if (hasOwnProperty.call(a, key)) {
- // `size` will be `-1` if `a` has more properties than `b`
- return (result = --size > -1);
- }
- });
+ /**
+ * Checks if `value` is, or can be coerced to, a finite number.
+ *
+ * Note: This is not the same as native `isFinite`, which will return true for
+ * booleans and empty strings. See http://es5.github.com/#x15.1.2.5.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is finite, else `false`.
+ * @example
+ *
+ * _.isFinite(-101);
+ * // => true
+ *
+ * _.isFinite('10');
+ * // => true
+ *
+ * _.isFinite(true);
+ * // => false
+ *
+ * _.isFinite('');
+ * // => false
+ *
+ * _.isFinite(Infinity);
+ * // => false
+ */
+ function isFinite(value) {
+ return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value));
}
- return result;
- }
- /**
- * Checks if `value` is, or can be coerced to, a finite number.
- *
- * Note: This is not the same as native `isFinite`, which will return true for
- * booleans and empty strings. See http://es5.github.com/#x15.1.2.5.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is finite, else `false`.
- * @example
- *
- * _.isFinite(-101);
- * // => true
- *
- * _.isFinite('10');
- * // => true
- *
- * _.isFinite(true);
- * // => false
- *
- * _.isFinite('');
- * // => false
- *
- * _.isFinite(Infinity);
- * // => false
- */
- function isFinite(value) {
- return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value));
- }
+ /**
+ * Checks if `value` is a function.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is a function, else `false`.
+ * @example
+ *
+ * _.isFunction(_);
+ * // => true
+ */
+ function isFunction(value) {
+ return typeof value == 'function';
+ }
+ // fallback for older versions of Chrome and Safari
+ if (isFunction(/x/)) {
+ isFunction = function(value) {
+ return value instanceof Function || toString.call(value) == funcClass;
+ };
+ }
- /**
- * Checks if `value` is a function.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is a function, else `false`.
- * @example
- *
- * _.isFunction(_);
- * // => true
- */
- function isFunction(value) {
- return typeof value == 'function';
- }
- // fallback for older versions of Chrome and Safari
- if (isFunction(/x/)) {
- isFunction = function(value) {
- return value instanceof Function || toString.call(value) == funcClass;
+ /**
+ * Checks if `value` is the language type of Object.
+ * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is an object, else `false`.
+ * @example
+ *
+ * _.isObject({});
+ * // => true
+ *
+ * _.isObject([1, 2, 3]);
+ * // => true
+ *
+ * _.isObject(1);
+ * // => false
+ */
+ function isObject(value) {
+ // check if the value is the ECMAScript language type of Object
+ // http://es5.github.com/#x8
+ // and avoid a V8 bug
+ // http://code.google.com/p/v8/issues/detail?id=2291
+ return value ? objectTypes[typeof value] : false;
+ }
+
+ /**
+ * Checks if `value` is `NaN`.
+ *
+ * Note: This is not the same as native `isNaN`, which will return `true` for
+ * `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is `NaN`, else `false`.
+ * @example
+ *
+ * _.isNaN(NaN);
+ * // => true
+ *
+ * _.isNaN(new Number(NaN));
+ * // => true
+ *
+ * isNaN(undefined);
+ * // => true
+ *
+ * _.isNaN(undefined);
+ * // => false
+ */
+ function isNaN(value) {
+ // `NaN` as a primitive is the only value that is not equal to itself
+ // (perform the [[Class]] check first to avoid errors with some host objects in IE)
+ return isNumber(value) && value != +value
+ }
+
+ /**
+ * Checks if `value` is `null`.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is `null`, else `false`.
+ * @example
+ *
+ * _.isNull(null);
+ * // => true
+ *
+ * _.isNull(undefined);
+ * // => false
+ */
+ function isNull(value) {
+ return value === null;
+ }
+
+ /**
+ * Checks if `value` is a number.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is a number, else `false`.
+ * @example
+ *
+ * _.isNumber(8.4 * 5);
+ * // => true
+ */
+ function isNumber(value) {
+ return typeof value == 'number' || toString.call(value) == numberClass;
+ }
+
+ /**
+ * Checks if a given `value` is an object created by the `Object` constructor.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.
+ * @example
+ *
+ * function Stooge(name, age) {
+ * this.name = name;
+ * this.age = age;
+ * }
+ *
+ * _.isPlainObject(new Stooge('moe', 40));
+ * // => false
+ *
+ * _.isPlainObject([1, 2, 3]);
+ * // => false
+ *
+ * _.isPlainObject({ 'name': 'moe', 'age': 40 });
+ * // => true
+ */
+ var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) {
+ if (!(value && typeof value == 'object')) {
+ return false;
+ }
+ var valueOf = value.valueOf,
+ objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto);
+
+ return objProto
+ ? value == objProto || (getPrototypeOf(value) == objProto && !isArguments(value))
+ : shimIsPlainObject(value);
};
- }
- /**
- * Checks if `value` is the language type of Object.
- * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is an object, else `false`.
- * @example
- *
- * _.isObject({});
- * // => true
- *
- * _.isObject([1, 2, 3]);
- * // => true
- *
- * _.isObject(1);
- * // => false
- */
- function isObject(value) {
- // check if the value is the ECMAScript language type of Object
- // http://es5.github.com/#x8
- // and avoid a V8 bug
- // http://code.google.com/p/v8/issues/detail?id=2291
- return value ? objectTypes[typeof value] : false;
- }
-
- /**
- * Checks if `value` is `NaN`.
- *
- * Note: This is not the same as native `isNaN`, which will return `true` for
- * `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is `NaN`, else `false`.
- * @example
- *
- * _.isNaN(NaN);
- * // => true
- *
- * _.isNaN(new Number(NaN));
- * // => true
- *
- * isNaN(undefined);
- * // => true
- *
- * _.isNaN(undefined);
- * // => false
- */
- function isNaN(value) {
- // `NaN` as a primitive is the only value that is not equal to itself
- // (perform the [[Class]] check first to avoid errors with some host objects in IE)
- return isNumber(value) && value != +value
- }
-
- /**
- * Checks if `value` is `null`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is `null`, else `false`.
- * @example
- *
- * _.isNull(null);
- * // => true
- *
- * _.isNull(undefined);
- * // => false
- */
- function isNull(value) {
- return value === null;
- }
-
- /**
- * Checks if `value` is a number.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is a number, else `false`.
- * @example
- *
- * _.isNumber(8.4 * 5);
- * // => true
- */
- function isNumber(value) {
- return typeof value == 'number' || toString.call(value) == numberClass;
- }
-
- /**
- * Checks if a given `value` is an object created by the `Object` constructor.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.
- * @example
- *
- * function Stooge(name, age) {
- * this.name = name;
- * this.age = age;
- * }
- *
- * _.isPlainObject(new Stooge('moe', 40));
- * // => false
- *
- * _.isPlainObject([1, 2, 3]);
- * // => false
- *
- * _.isPlainObject({ 'name': 'moe', 'age': 40 });
- * // => true
- */
- var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) {
- if (!(value && typeof value == 'object')) {
- return false;
+ /**
+ * Checks if `value` is a regular expression.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is a regular expression, else `false`.
+ * @example
+ *
+ * _.isRegExp(/moe/);
+ * // => true
+ */
+ function isRegExp(value) {
+ return value instanceof RegExp || toString.call(value) == regexpClass;
}
- var valueOf = value.valueOf,
- objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto);
- return objProto
- ? value == objProto || (getPrototypeOf(value) == objProto && !isArguments(value))
- : shimIsPlainObject(value);
- };
-
- /**
- * Checks if `value` is a regular expression.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is a regular expression, else `false`.
- * @example
- *
- * _.isRegExp(/moe/);
- * // => true
- */
- function isRegExp(value) {
- return value instanceof RegExp || toString.call(value) == regexpClass;
- }
-
- /**
- * Checks if `value` is a string.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is a string, else `false`.
- * @example
- *
- * _.isString('moe');
- * // => true
- */
- function isString(value) {
- return typeof value == 'string' || toString.call(value) == stringClass;
- }
-
- /**
- * Checks if `value` is `undefined`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Mixed} value The value to check.
- * @returns {Boolean} Returns `true`, if the `value` is `undefined`, else `false`.
- * @example
- *
- * _.isUndefined(void 0);
- * // => true
- */
- function isUndefined(value) {
- return typeof value == 'undefined';
- }
-
- /**
- * Recursively merges own enumerable properties of the source object(s), that
- * don't resolve to `undefined`, into the destination object. Subsequent sources
- * will overwrite propery assignments of previous sources. If a `callback` function
- * is passed, it will be executed to produce the merged values of the destination
- * and source properties. If `callback` returns `undefined`, merging will be
- * handled by the method instead. The `callback` is bound to `thisArg` and
- * invoked with two arguments; (objectValue, sourceValue).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The destination object.
- * @param {Object} [source1, source2, ...] The source objects.
- * @param {Function} [callback] The function to customize merging properties.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @param- {Object} [deepIndicator] Internally used to indicate that `stackA`
- * and `stackB` are arrays of traversed objects instead of source objects.
- * @param- {Array} [stackA=[]] Internally used to track traversed source objects.
- * @param- {Array} [stackB=[]] Internally used to associate values with their
- * source counterparts.
- * @returns {Object} Returns the destination object.
- * @example
- *
- * var names = {
- * 'stooges': [
- * { 'name': 'moe' },
- * { 'name': 'larry' }
- * ]
- * };
- *
- * var ages = {
- * 'stooges': [
- * { 'age': 40 },
- * { 'age': 50 }
- * ]
- * };
- *
- * _.merge(names, ages);
- * // => { 'stooges': [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] }
- *
- * var food = {
- * 'fruits': ['apple'],
- * 'vegetables': ['beet']
- * };
- *
- * var otherFood = {
- * 'fruits': ['banana'],
- * 'vegetables': ['carrot']
- * };
- *
- * _.merge(food, otherFood, function(a, b) {
- * return _.isArray(a) ? a.concat(b) : undefined;
- * });
- * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] }
- */
- function merge(object, source, deepIndicator) {
- var args = arguments,
- index = 0,
- length = 2;
-
- if (!isObject(object)) {
- return object;
+ /**
+ * Checks if `value` is a string.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is a string, else `false`.
+ * @example
+ *
+ * _.isString('moe');
+ * // => true
+ */
+ function isString(value) {
+ return typeof value == 'string' || toString.call(value) == stringClass;
}
- if (deepIndicator === indicatorObject) {
- var callback = args[3],
- stackA = args[4],
- stackB = args[5];
- } else {
- stackA = [];
- stackB = [];
- // allows working with `_.reduce` and `_.reduceRight` without
- // using their `callback` arguments, `index|key` and `collection`
- if (typeof deepIndicator != 'number') {
- length = args.length;
+ /**
+ * Checks if `value` is `undefined`.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Mixed} value The value to check.
+ * @returns {Boolean} Returns `true`, if the `value` is `undefined`, else `false`.
+ * @example
+ *
+ * _.isUndefined(void 0);
+ * // => true
+ */
+ function isUndefined(value) {
+ return typeof value == 'undefined';
+ }
+
+ /**
+ * Recursively merges own enumerable properties of the source object(s), that
+ * don't resolve to `undefined`, into the destination object. Subsequent sources
+ * will overwrite propery assignments of previous sources. If a `callback` function
+ * is passed, it will be executed to produce the merged values of the destination
+ * and source properties. If `callback` returns `undefined`, merging will be
+ * handled by the method instead. The `callback` is bound to `thisArg` and
+ * invoked with two arguments; (objectValue, sourceValue).
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The destination object.
+ * @param {Object} [source1, source2, ...] The source objects.
+ * @param {Function} [callback] The function to customize merging properties.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @param- {Object} [deepIndicator] Internally used to indicate that `stackA`
+ * and `stackB` are arrays of traversed objects instead of source objects.
+ * @param- {Array} [stackA=[]] Internally used to track traversed source objects.
+ * @param- {Array} [stackB=[]] Internally used to associate values with their
+ * source counterparts.
+ * @returns {Object} Returns the destination object.
+ * @example
+ *
+ * var names = {
+ * 'stooges': [
+ * { 'name': 'moe' },
+ * { 'name': 'larry' }
+ * ]
+ * };
+ *
+ * var ages = {
+ * 'stooges': [
+ * { 'age': 40 },
+ * { 'age': 50 }
+ * ]
+ * };
+ *
+ * _.merge(names, ages);
+ * // => { 'stooges': [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] }
+ *
+ * var food = {
+ * 'fruits': ['apple'],
+ * 'vegetables': ['beet']
+ * };
+ *
+ * var otherFood = {
+ * 'fruits': ['banana'],
+ * 'vegetables': ['carrot']
+ * };
+ *
+ * _.merge(food, otherFood, function(a, b) {
+ * return _.isArray(a) ? a.concat(b) : undefined;
+ * });
+ * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] }
+ */
+ function merge(object, source, deepIndicator) {
+ var args = arguments,
+ index = 0,
+ length = 2;
+
+ if (!isObject(object)) {
+ return object;
}
- if (length > 3 && typeof args[length - 2] == 'function') {
- callback = createCallback(args[--length - 1], args[length--], 2);
- } else if (length > 2 && typeof args[length - 1] == 'function') {
- callback = args[--length];
+ if (deepIndicator === indicatorObject) {
+ var callback = args[3],
+ stackA = args[4],
+ stackB = args[5];
+ } else {
+ stackA = [];
+ stackB = [];
+
+ // allows working with `_.reduce` and `_.reduceRight` without
+ // using their `callback` arguments, `index|key` and `collection`
+ if (typeof deepIndicator != 'number') {
+ length = args.length;
+ }
+ if (length > 3 && typeof args[length - 2] == 'function') {
+ callback = createCallback(args[--length - 1], args[length--], 2);
+ } else if (length > 2 && typeof args[length - 1] == 'function') {
+ callback = args[--length];
+ }
}
- }
- while (++index < length) {
- (isArray(args[index]) ? forEach : forOwn)(args[index], function(source, key) {
- var found,
- isArr,
- result = source,
- value = object[key];
+ while (++index < length) {
+ (isArray(args[index]) ? forEach : forOwn)(args[index], function(source, key) {
+ var found,
+ isArr,
+ result = source,
+ value = object[key];
- if (source && ((isArr = isArray(source)) || isPlainObject(source))) {
- // avoid merging previously merged cyclic sources
- var stackLength = stackA.length;
- while (stackLength--) {
- if ((found = stackA[stackLength] == source)) {
- value = stackB[stackLength];
- break;
- }
- }
- if (!found) {
- value = isArr
- ? (isArray(value) ? value : [])
- : (isPlainObject(value) ? value : {});
-
- if (callback) {
- result = callback(value, source);
- if (typeof result != 'undefined') {
- value = result;
+ if (source && ((isArr = isArray(source)) || isPlainObject(source))) {
+ // avoid merging previously merged cyclic sources
+ var stackLength = stackA.length;
+ while (stackLength--) {
+ if ((found = stackA[stackLength] == source)) {
+ value = stackB[stackLength];
+ break;
}
}
- // add `source` and associated `value` to the stack of traversed objects
- stackA.push(source);
- stackB.push(value);
+ if (!found) {
+ value = isArr
+ ? (isArray(value) ? value : [])
+ : (isPlainObject(value) ? value : {});
- // recursively merge objects and arrays (susceptible to call stack limits)
- if (!callback) {
- value = merge(value, source, indicatorObject, callback, stackA, stackB);
+ if (callback) {
+ result = callback(value, source);
+ if (typeof result != 'undefined') {
+ value = result;
+ }
+ }
+ // add `source` and associated `value` to the stack of traversed objects
+ stackA.push(source);
+ stackB.push(value);
+
+ // recursively merge objects and arrays (susceptible to call stack limits)
+ if (!callback) {
+ value = merge(value, source, indicatorObject, callback, stackA, stackB);
+ }
}
}
- }
- else {
- if (callback) {
- result = callback(value, source);
- if (typeof result == 'undefined') {
- result = source;
+ else {
+ if (callback) {
+ result = callback(value, source);
+ if (typeof result == 'undefined') {
+ result = source;
+ }
+ }
+ if (typeof result != 'undefined') {
+ value = result;
}
}
- if (typeof result != 'undefined') {
- value = result;
- }
- }
- object[key] = value;
- });
- }
- return object;
- }
-
- /**
- * Creates a shallow clone of `object` excluding the specified properties.
- * Property names may be specified as individual arguments or as arrays of
- * property names. If a `callback` function is passed, it will be executed
- * for each property in the `object`, omitting the properties `callback`
- * returns truthy for. The `callback` is bound to `thisArg` and invoked
- * with three arguments; (value, key, object).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The source object.
- * @param {Function|String} callback|[prop1, prop2, ...] The properties to omit
- * or the function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns an object without the omitted properties.
- * @example
- *
- * _.omit({ 'name': 'moe', 'age': 40 }, 'age');
- * // => { 'name': 'moe' }
- *
- * _.omit({ 'name': 'moe', 'age': 40 }, function(value) {
- * return typeof value == 'number';
- * });
- * // => { 'name': 'moe' }
- */
- function omit(object, callback, thisArg) {
- var isFunc = typeof callback == 'function',
- result = {};
-
- if (isFunc) {
- callback = createCallback(callback, thisArg);
- } else {
- var props = concat.apply(arrayRef, arguments);
- }
- forIn(object, function(value, key, object) {
- if (isFunc
- ? !callback(value, key, object)
- : indexOf(props, key, 1) < 0
- ) {
- result[key] = value;
+ object[key] = value;
+ });
}
- });
- return result;
- }
-
- /**
- * Creates a two dimensional array of the given object's key-value pairs,
- * i.e. `[[key1, value1], [key2, value2]]`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns new array of key-value pairs.
- * @example
- *
- * _.pairs({ 'moe': 30, 'larry': 40 });
- * // => [['moe', 30], ['larry', 40]] (order is not guaranteed)
- */
- function pairs(object) {
- var index = -1,
- props = keys(object),
- length = props.length,
- result = Array(length);
-
- while (++index < length) {
- var key = props[index];
- result[index] = [key, object[key]];
+ return object;
}
- return result;
- }
- /**
- * Creates a shallow clone of `object` composed of the specified properties.
- * Property names may be specified as individual arguments or as arrays of property
- * names. If `callback` is passed, it will be executed for each property in the
- * `object`, picking the properties `callback` returns truthy for. The `callback`
- * is bound to `thisArg` and invoked with three arguments; (value, key, object).
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The source object.
- * @param {Array|Function|String} callback|[prop1, prop2, ...] The function called
- * per iteration or properties to pick, either as individual arguments or arrays.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns an object composed of the picked properties.
- * @example
- *
- * _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name');
- * // => { 'name': 'moe' }
- *
- * _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) {
- * return key.charAt(0) != '_';
- * });
- * // => { 'name': 'moe' }
- */
- function pick(object, callback, thisArg) {
- var result = {};
- if (typeof callback != 'function') {
- var index = 0,
- props = concat.apply(arrayRef, arguments),
- length = isObject(object) ? props.length : 0;
+ /**
+ * Creates a shallow clone of `object` excluding the specified properties.
+ * Property names may be specified as individual arguments or as arrays of
+ * property names. If a `callback` function is passed, it will be executed
+ * for each property in the `object`, omitting the properties `callback`
+ * returns truthy for. The `callback` is bound to `thisArg` and invoked
+ * with three arguments; (value, key, object).
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The source object.
+ * @param {Function|String} callback|[prop1, prop2, ...] The properties to omit
+ * or the function called per iteration.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Object} Returns an object without the omitted properties.
+ * @example
+ *
+ * _.omit({ 'name': 'moe', 'age': 40 }, 'age');
+ * // => { 'name': 'moe' }
+ *
+ * _.omit({ 'name': 'moe', 'age': 40 }, function(value) {
+ * return typeof value == 'number';
+ * });
+ * // => { 'name': 'moe' }
+ */
+ function omit(object, callback, thisArg) {
+ var isFunc = typeof callback == 'function',
+ result = {};
- while (++index < length) {
- var key = props[index];
- if (key in object) {
- result[key] = object[key];
- }
+ if (isFunc) {
+ callback = createCallback(callback, thisArg);
+ } else {
+ var props = concat.apply(arrayRef, arguments);
}
- } else {
- callback = createCallback(callback, thisArg);
forIn(object, function(value, key, object) {
- if (callback(value, key, object)) {
+ if (isFunc
+ ? !callback(value, key, object)
+ : indexOf(props, key, 1) < 0
+ ) {
result[key] = value;
}
});
+ return result;
}
- return result;
- }
- /**
- * Creates an array composed of the own enumerable property values of `object`.
- *
- * @static
- * @memberOf _
- * @category Objects
- * @param {Object} object The object to inspect.
- * @returns {Array} Returns a new array of property values.
- * @example
- *
- * _.values({ 'one': 1, 'two': 2, 'three': 3 });
- * // => [1, 2, 3]
- */
- function values(object) {
- var index = -1,
- props = keys(object),
- length = props.length,
- result = Array(length);
-
- while (++index < length) {
- result[index] = object[props[index]];
- }
- return result;
- }
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Creates an array of elements from the specified indexes, or keys, of the
- * `collection`. Indexes may be specified as individual arguments or as arrays
- * of indexes.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Array|Number|String} [index1, index2, ...] The indexes of
- * `collection` to retrieve, either as individual arguments or arrays.
- * @returns {Array} Returns a new array of elements corresponding to the
- * provided indexes.
- * @example
- *
- * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]);
- * // => ['a', 'c', 'e']
- *
- * _.at(['moe', 'larry', 'curly'], 0, 2);
- * // => ['moe', 'curly']
- */
- function at(collection) {
- var index = -1,
- props = concat.apply(arrayRef, slice(arguments, 1)),
- length = props.length,
- result = Array(length);
-
- if (noCharByIndex && isString(collection)) {
- collection = collection.split('');
- }
- while(++index < length) {
- result[index] = collection[props[index]];
- }
- return result;
- }
-
- /**
- * Checks if a given `target` element is present in a `collection` using strict
- * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
- * as the offset from the end of the collection.
- *
- * @static
- * @memberOf _
- * @alias include
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Mixed} target The value to check for.
- * @param {Number} [fromIndex=0] The index to search from.
- * @returns {Boolean} Returns `true` if the `target` element is found, else `false`.
- * @example
- *
- * _.contains([1, 2, 3], 1);
- * // => true
- *
- * _.contains([1, 2, 3], 1, 2);
- * // => false
- *
- * _.contains({ 'name': 'moe', 'age': 40 }, 'moe');
- * // => true
- *
- * _.contains('curly', 'ur');
- * // => true
- */
- function contains(collection, target, fromIndex) {
- var index = -1,
- length = collection ? collection.length : 0,
- result = false;
-
- fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0;
- if (typeof length == 'number') {
- result = (isString(collection)
- ? collection.indexOf(target, fromIndex)
- : indexOf(collection, target, fromIndex)
- ) > -1;
- } else {
- each(collection, function(value) {
- if (++index >= fromIndex) {
- return !(result = value === target);
- }
- });
- }
- return result;
- }
-
- /**
- * Creates an object composed of keys returned from running each element of the
- * `collection` through the given `callback`. The corresponding value of each key
- * is the number of times the key was returned by the `callback`. The `callback`
- * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns the composed aggregate object.
- * @example
- *
- * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); });
- * // => { '4': 1, '6': 2 }
- *
- * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
- * // => { '4': 1, '6': 2 }
- *
- * _.countBy(['one', 'two', 'three'], 'length');
- * // => { '3': 2, '5': 1 }
- */
- function countBy(collection, callback, thisArg) {
- var result = {};
- callback = createCallback(callback, thisArg);
-
- forEach(collection, function(value, key, collection) {
- key = callback(value, key, collection) + '';
- (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1);
- });
- return result;
- }
-
- /**
- * Checks if the `callback` returns a truthy value for **all** elements of a
- * `collection`. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias all
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Boolean} Returns `true` if all elements pass the callback check,
- * else `false`.
- * @example
- *
- * _.every([true, 1, null, 'yes'], Boolean);
- * // => false
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.every(stooges, 'age');
- * // => true
- *
- * // using "_.where" callback shorthand
- * _.every(stooges, { 'age': 50 });
- * // => false
- */
- function every(collection, callback, thisArg) {
- var result = true;
- callback = createCallback(callback, thisArg);
-
- if (isArray(collection)) {
+ /**
+ * Creates a two dimensional array of the given object's key-value pairs,
+ * i.e. `[[key1, value1], [key2, value2]]`.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns new array of key-value pairs.
+ * @example
+ *
+ * _.pairs({ 'moe': 30, 'larry': 40 });
+ * // => [['moe', 30], ['larry', 40]] (order is not guaranteed)
+ */
+ function pairs(object) {
var index = -1,
- length = collection.length;
+ props = keys(object),
+ length = props.length,
+ result = Array(length);
while (++index < length) {
- if (!(result = !!callback(collection[index], index, collection))) {
- break;
- }
+ var key = props[index];
+ result[index] = [key, object[key]];
}
- } else {
- each(collection, function(value, index, collection) {
- return (result = !!callback(value, index, collection));
- });
+ return result;
}
- return result;
- }
- /**
- * Examines each element in a `collection`, returning an array of all elements
- * the `callback` returns truthy for. The `callback` is bound to `thisArg` and
- * invoked with three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias select
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of elements that passed the callback check.
- * @example
- *
- * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
- * // => [2, 4, 6]
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.filter(food, 'organic');
- * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
- *
- * // using "_.where" callback shorthand
- * _.filter(food, { 'type': 'fruit' });
- * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
- */
- function filter(collection, callback, thisArg) {
- var result = [];
- callback = createCallback(callback, thisArg);
+ /**
+ * Creates a shallow clone of `object` composed of the specified properties.
+ * Property names may be specified as individual arguments or as arrays of property
+ * names. If `callback` is passed, it will be executed for each property in the
+ * `object`, picking the properties `callback` returns truthy for. The `callback`
+ * is bound to `thisArg` and invoked with three arguments; (value, key, object).
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The source object.
+ * @param {Array|Function|String} callback|[prop1, prop2, ...] The function called
+ * per iteration or properties to pick, either as individual arguments or arrays.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Object} Returns an object composed of the picked properties.
+ * @example
+ *
+ * _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name');
+ * // => { 'name': 'moe' }
+ *
+ * _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) {
+ * return key.charAt(0) != '_';
+ * });
+ * // => { 'name': 'moe' }
+ */
+ function pick(object, callback, thisArg) {
+ var result = {};
+ if (typeof callback != 'function') {
+ var index = 0,
+ props = concat.apply(arrayRef, arguments),
+ length = isObject(object) ? props.length : 0;
- if (isArray(collection)) {
- var index = -1,
- length = collection.length;
-
- while (++index < length) {
- var value = collection[index];
- if (callback(value, index, collection)) {
- result.push(value);
- }
- }
- } else {
- each(collection, function(value, index, collection) {
- if (callback(value, index, collection)) {
- result.push(value);
- }
- });
- }
- return result;
- }
-
- /**
- * Examines each element in a `collection`, returning the first that the `callback`
- * returns truthy for. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias detect
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the element that passed the callback check,
- * else `undefined`.
- * @example
- *
- * var even = _.find([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
- * // => 2
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'banana', 'organic': true, 'type': 'fruit' },
- * { 'name': 'beet', 'organic': false, 'type': 'vegetable' },
- * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * var veggie = _.find(food, { 'type': 'vegetable' });
- * // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
- *
- * // using "_.pluck" callback shorthand
- * var healthy = _.find(food, 'organic');
- * // => { 'name': 'banana', 'organic': true, 'type': 'fruit' }
- */
- function find(collection, callback, thisArg) {
- var result;
- callback = createCallback(callback, thisArg);
-
- forEach(collection, function(value, index, collection) {
- if (callback(value, index, collection)) {
- result = value;
- return false;
- }
- });
- return result;
- }
-
- /**
- * Iterates over a `collection`, executing the `callback` for each element in
- * the `collection`. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection). Callbacks may exit iteration early
- * by explicitly returning `false`.
- *
- * @static
- * @memberOf _
- * @alias each
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array|Object|String} Returns `collection`.
- * @example
- *
- * _([1, 2, 3]).forEach(alert).join(',');
- * // => alerts each number and returns '1,2,3'
- *
- * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert);
- * // => alerts each number value (order is not guaranteed)
- */
- function forEach(collection, callback, thisArg) {
- if (callback && typeof thisArg == 'undefined' && isArray(collection)) {
- var index = -1,
- length = collection.length;
-
- while (++index < length) {
- if (callback(collection[index], index, collection) === false) {
- break;
- }
- }
- } else {
- each(collection, callback, thisArg);
- }
- return collection;
- }
-
- /**
- * Creates an object composed of keys returned from running each element of the
- * `collection` through the `callback`. The corresponding value of each key is
- * an array of elements passed to `callback` that returned the key. The `callback`
- * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Object} Returns the composed aggregate object.
- * @example
- *
- * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); });
- * // => { '4': [4.2], '6': [6.1, 6.4] }
- *
- * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
- * // => { '4': [4.2], '6': [6.1, 6.4] }
- *
- * // using "_.pluck" callback shorthand
- * _.groupBy(['one', 'two', 'three'], 'length');
- * // => { '3': ['one', 'two'], '5': ['three'] }
- */
- function groupBy(collection, callback, thisArg) {
- var result = {};
- callback = createCallback(callback, thisArg);
-
- forEach(collection, function(value, key, collection) {
- key = callback(value, key, collection) + '';
- (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);
- });
- return result;
- }
-
- /**
- * Invokes the method named by `methodName` on each element in the `collection`,
- * returning an array of the results of each invoked method. Additional arguments
- * will be passed to each invoked method. If `methodName` is a function, it will
- * be invoked for, and `this` bound to, each element in the `collection`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|String} methodName The name of the method to invoke or
- * the function invoked per iteration.
- * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
- * @returns {Array} Returns a new array of the results of each invoked method.
- * @example
- *
- * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
- * // => [[1, 5, 7], [1, 2, 3]]
- *
- * _.invoke([123, 456], String.prototype.split, '');
- * // => [['1', '2', '3'], ['4', '5', '6']]
- */
- function invoke(collection, methodName) {
- var args = slice(arguments, 2),
- index = -1,
- isFunc = typeof methodName == 'function',
- length = collection ? collection.length : 0,
- result = Array(typeof length == 'number' ? length : 0);
-
- forEach(collection, function(value) {
- result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args);
- });
- return result;
- }
-
- /**
- * Creates an array of values by running each element in the `collection`
- * through the `callback`. The `callback` is bound to `thisArg` and invoked with
- * three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias collect
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of the results of each `callback` execution.
- * @example
- *
- * _.map([1, 2, 3], function(num) { return num * 3; });
- * // => [3, 6, 9]
- *
- * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
- * // => [3, 6, 9] (order is not guaranteed)
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.map(stooges, 'name');
- * // => ['moe', 'larry']
- */
- function map(collection, callback, thisArg) {
- var index = -1,
- length = collection ? collection.length : 0,
- result = Array(typeof length == 'number' ? length : 0);
-
- callback = createCallback(callback, thisArg);
- if (isArray(collection)) {
- while (++index < length) {
- result[index] = callback(collection[index], index, collection);
- }
- } else {
- each(collection, function(value, key, collection) {
- result[++index] = callback(value, key, collection);
- });
- }
- return result;
- }
-
- /**
- * Retrieves the maximum value of an `array`. If `callback` is passed,
- * it will be executed for each value in the `array` to generate the
- * criterion by which the value is ranked. The `callback` is bound to
- * `thisArg` and invoked with three arguments; (value, index, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the maximum value.
- * @example
- *
- * _.max([4, 2, 8, 6]);
- * // => 8
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.max(stooges, function(stooge) { return stooge.age; });
- * // => { 'name': 'larry', 'age': 50 };
- *
- * // using "_.pluck" callback shorthand
- * _.max(stooges, 'age');
- * // => { 'name': 'larry', 'age': 50 };
- */
- function max(collection, callback, thisArg) {
- var computed = -Infinity,
- result = computed;
-
- if (!callback && isArray(collection)) {
- var index = -1,
- length = collection.length;
-
- while (++index < length) {
- var value = collection[index];
- if (value > result) {
- result = value;
- }
- }
- } else {
- callback = !callback && isString(collection)
- ? charAtCallback
- : createCallback(callback, thisArg);
-
- each(collection, function(value, index, collection) {
- var current = callback(value, index, collection);
- if (current > computed) {
- computed = current;
- result = value;
- }
- });
- }
- return result;
- }
-
- /**
- * Retrieves the minimum value of an `array`. If `callback` is passed,
- * it will be executed for each value in the `array` to generate the
- * criterion by which the value is ranked. The `callback` is bound to `thisArg`
- * and invoked with three arguments; (value, index, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the minimum value.
- * @example
- *
- * _.min([4, 2, 8, 6]);
- * // => 2
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.min(stooges, function(stooge) { return stooge.age; });
- * // => { 'name': 'moe', 'age': 40 };
- *
- * // using "_.pluck" callback shorthand
- * _.min(stooges, 'age');
- * // => { 'name': 'moe', 'age': 40 };
- */
- function min(collection, callback, thisArg) {
- var computed = Infinity,
- result = computed;
-
- if (!callback && isArray(collection)) {
- var index = -1,
- length = collection.length;
-
- while (++index < length) {
- var value = collection[index];
- if (value < result) {
- result = value;
- }
- }
- } else {
- callback = !callback && isString(collection)
- ? charAtCallback
- : createCallback(callback, thisArg);
-
- each(collection, function(value, index, collection) {
- var current = callback(value, index, collection);
- if (current < computed) {
- computed = current;
- result = value;
- }
- });
- }
- return result;
- }
-
- /**
- * Retrieves the value of a specified property from all elements in the `collection`.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {String} property The property to pluck.
- * @returns {Array} Returns a new array of property values.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.pluck(stooges, 'name');
- * // => ['moe', 'larry']
- */
- var pluck = map;
-
- /**
- * Reduces a `collection` to a value that is the accumulated result of running
- * each element in the `collection` through the `callback`, where each successive
- * `callback` execution consumes the return value of the previous execution.
- * If `accumulator` is not passed, the first element of the `collection` will be
- * used as the initial `accumulator` value. The `callback` is bound to `thisArg`
- * and invoked with four arguments; (accumulator, value, index|key, collection).
- *
- * @static
- * @memberOf _
- * @alias foldl, inject
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [accumulator] Initial value of the accumulator.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the accumulated value.
- * @example
- *
- * var sum = _.reduce([1, 2, 3], function(sum, num) {
- * return sum + num;
- * });
- * // => 6
- *
- * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
- * result[key] = num * 3;
- * return result;
- * }, {});
- * // => { 'a': 3, 'b': 6, 'c': 9 }
- */
- function reduce(collection, callback, accumulator, thisArg) {
- var noaccum = arguments.length < 3;
- callback = createCallback(callback, thisArg, 4);
-
- if (isArray(collection)) {
- var index = -1,
- length = collection.length;
-
- if (noaccum) {
- accumulator = collection[++index];
- }
- while (++index < length) {
- accumulator = callback(accumulator, collection[index], index, collection);
- }
- } else {
- each(collection, function(value, index, collection) {
- accumulator = noaccum
- ? (noaccum = false, value)
- : callback(accumulator, value, index, collection)
- });
- }
- return accumulator;
- }
-
- /**
- * This method is similar to `_.reduce`, except that it iterates over a
- * `collection` from right to left.
- *
- * @static
- * @memberOf _
- * @alias foldr
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function} [callback=identity] The function called per iteration.
- * @param {Mixed} [accumulator] Initial value of the accumulator.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the accumulated value.
- * @example
- *
- * var list = [[0, 1], [2, 3], [4, 5]];
- * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
- * // => [4, 5, 2, 3, 0, 1]
- */
- function reduceRight(collection, callback, accumulator, thisArg) {
- var iterable = collection,
- length = collection ? collection.length : 0,
- noaccum = arguments.length < 3;
-
- if (typeof length != 'number') {
- var props = keys(collection);
- length = props.length;
- } else if (noCharByIndex && isString(collection)) {
- iterable = collection.split('');
- }
- callback = createCallback(callback, thisArg, 4);
- forEach(collection, function(value, index, collection) {
- index = props ? props[--length] : --length;
- accumulator = noaccum
- ? (noaccum = false, iterable[index])
- : callback(accumulator, iterable[index], index, collection);
- });
- return accumulator;
- }
-
- /**
- * The opposite of `_.filter`, this method returns the elements of a
- * `collection` that `callback` does **not** return truthy for.
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of elements that did **not** pass the
- * callback check.
- * @example
- *
- * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
- * // => [1, 3, 5]
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.reject(food, 'organic');
- * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
- *
- * // using "_.where" callback shorthand
- * _.reject(food, { 'type': 'fruit' });
- * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
- */
- function reject(collection, callback, thisArg) {
- callback = createCallback(callback, thisArg);
- return filter(collection, function(value, index, collection) {
- return !callback(value, index, collection);
- });
- }
-
- /**
- * Creates an array of shuffled `array` values, using a version of the
- * Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to shuffle.
- * @returns {Array} Returns a new shuffled collection.
- * @example
- *
- * _.shuffle([1, 2, 3, 4, 5, 6]);
- * // => [4, 1, 6, 3, 5, 2]
- */
- function shuffle(collection) {
- var index = -1,
- length = collection ? collection.length : 0,
- result = Array(typeof length == 'number' ? length : 0);
-
- forEach(collection, function(value) {
- var rand = floor(nativeRandom() * (++index + 1));
- result[index] = result[rand];
- result[rand] = value;
- });
- return result;
- }
-
- /**
- * Gets the size of the `collection` by returning `collection.length` for arrays
- * and array-like objects or the number of own enumerable properties for objects.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to inspect.
- * @returns {Number} Returns `collection.length` or number of own enumerable properties.
- * @example
- *
- * _.size([1, 2]);
- * // => 2
- *
- * _.size({ 'one': 1, 'two': 2, 'three': 3 });
- * // => 3
- *
- * _.size('curly');
- * // => 5
- */
- function size(collection) {
- var length = collection ? collection.length : 0;
- return typeof length == 'number' ? length : keys(collection).length;
- }
-
- /**
- * Checks if the `callback` returns a truthy value for **any** element of a
- * `collection`. The function returns as soon as it finds passing value, and
- * does not iterate over the entire `collection`. The `callback` is bound to
- * `thisArg` and invoked with three arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias any
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Boolean} Returns `true` if any element passes the callback check,
- * else `false`.
- * @example
- *
- * _.some([null, 0, 'yes', false], Boolean);
- * // => true
- *
- * var food = [
- * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
- * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.some(food, 'organic');
- * // => true
- *
- * // using "_.where" callback shorthand
- * _.some(food, { 'type': 'meat' });
- * // => false
- */
- function some(collection, callback, thisArg) {
- var result;
- callback = createCallback(callback, thisArg);
-
- if (isArray(collection)) {
- var index = -1,
- length = collection.length;
-
- while (++index < length) {
- if ((result = callback(collection[index], index, collection))) {
- break;
- }
- }
- } else {
- each(collection, function(value, index, collection) {
- return !(result = callback(value, index, collection));
- });
- }
- return !!result;
- }
-
- /**
- * Creates an array of elements, sorted in ascending order by the results of
- * running each element in the `collection` through the `callback`. This method
- * performs a stable sort, that is, it will preserve the original sort order of
- * equal elements. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index|key, collection).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a new array of sorted elements.
- * @example
- *
- * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); });
- * // => [3, 1, 2]
- *
- * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
- * // => [3, 1, 2]
- *
- * // using "_.pluck" callback shorthand
- * _.sortBy(['banana', 'strawberry', 'apple'], 'length');
- * // => ['apple', 'banana', 'strawberry']
- */
- function sortBy(collection, callback, thisArg) {
- var index = -1,
- length = collection ? collection.length : 0,
- result = Array(typeof length == 'number' ? length : 0);
-
- callback = createCallback(callback, thisArg);
- forEach(collection, function(value, key, collection) {
- result[++index] = {
- 'criteria': callback(value, key, collection),
- 'index': index,
- 'value': value
- };
- });
-
- length = result.length;
- result.sort(compareAscending);
- while (length--) {
- result[length] = result[length].value;
- }
- return result;
- }
-
- /**
- * Converts the `collection` to an array.
- *
- * @static
- * @memberOf _
- * @category Collections
- * @param {Array|Object|String} collection The collection to convert.
- * @returns {Array} Returns the new converted array.
- * @example
- *
- * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
- * // => [2, 3, 4]
- */
- function toArray(collection) {
- if (collection && typeof collection.length == 'number') {
- return noCharByIndex && isString(collection)
- ? collection.split('')
- : slice(collection);
- }
- return values(collection);
- }
-
- /**
- * Examines each element in a `collection`, returning an array of all elements
- * that have the given `properties`. When checking `properties`, this method
- * performs a deep comparison between values to determine if they are equivalent
- * to each other.
- *
- * @static
- * @memberOf _
- * @type Function
- * @category Collections
- * @param {Array|Object|String} collection The collection to iterate over.
- * @param {Object} properties The object of property values to filter by.
- * @returns {Array} Returns a new array of elements that have the given `properties`.
- * @example
- *
- * var stooges = [
- * { 'name': 'moe', 'age': 40 },
- * { 'name': 'larry', 'age': 50 }
- * ];
- *
- * _.where(stooges, { 'age': 40 });
- * // => [{ 'name': 'moe', 'age': 40 }]
- */
- var where = filter;
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Creates an array with all falsey values of `array` removed. The values
- * `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to compact.
- * @returns {Array} Returns a new filtered array.
- * @example
- *
- * _.compact([0, 1, false, 2, '', 3]);
- * // => [1, 2, 3]
- */
- function compact(array) {
- var index = -1,
- length = array ? array.length : 0,
- result = [];
-
- while (++index < length) {
- var value = array[index];
- if (value) {
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Creates an array of `array` elements not present in the other arrays
- * using strict equality for comparisons, i.e. `===`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to process.
- * @param {Array} [array1, array2, ...] Arrays to check.
- * @returns {Array} Returns a new array of `array` elements not present in the
- * other arrays.
- * @example
- *
- * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
- * // => [1, 3, 4]
- */
- function difference(array) {
- var index = -1,
- length = array ? array.length : 0,
- flattened = concat.apply(arrayRef, arguments),
- contains = cachedContains(flattened, length),
- result = [];
-
- while (++index < length) {
- var value = array[index];
- if (!contains(value)) {
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Gets the first element of the `array`. If a number `n` is passed, the first
- * `n` elements of the `array` are returned. If a `callback` function is passed,
- * the first elements the `callback` returns truthy for are returned. The `callback`
- * is bound to `thisArg` and invoked with three arguments; (value, index, array).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias head, take
- * @category Arrays
- * @param {Array} array The array to query.
- * @param {Function|Object|Number|String} [callback|n] The function called
- * per element or the number of elements to return. If a property name or
- * object is passed, it will be used to create a "_.pluck" or "_.where"
- * style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the first element(s) of `array`.
- * @example
- *
- * _.first([1, 2, 3]);
- * // => 1
- *
- * _.first([1, 2, 3], 2);
- * // => [1, 2]
- *
- * _.first([1, 2, 3], function(num) {
- * return num < 3;
- * });
- * // => [1, 2]
- *
- * var food = [
- * { 'name': 'banana', 'organic': true },
- * { 'name': 'beet', 'organic': false },
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.first(food, 'organic');
- * // => [{ 'name': 'banana', 'organic': true }]
- *
- * var food = [
- * { 'name': 'apple', 'type': 'fruit' },
- * { 'name': 'banana', 'type': 'fruit' },
- * { 'name': 'beet', 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * _.first(food, { 'type': 'fruit' });
- * // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }]
- */
- function first(array, callback, thisArg) {
- if (array) {
- var n = 0,
- length = array.length;
-
- if (typeof callback != 'number' && callback != null) {
- var index = -1;
- callback = createCallback(callback, thisArg);
- while (++index < length && callback(array[index], index, array)) {
- n++;
- }
- } else {
- n = callback;
- if (n == null || thisArg) {
- return array[0];
- }
- }
- return slice(array, 0, nativeMin(nativeMax(0, n), length));
- }
- }
-
- /**
- * Flattens a nested array (the nesting can be to any depth). If `shallow` is
- * truthy, `array` will only be flattened a single level.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to compact.
- * @param {Boolean} shallow A flag to indicate only flattening a single level.
- * @returns {Array} Returns a new flattened array.
- * @example
- *
- * _.flatten([1, [2], [3, [[4]]]]);
- * // => [1, 2, 3, 4];
- *
- * _.flatten([1, [2], [3, [[4]]]], true);
- * // => [1, 2, 3, [[4]]];
- */
- function flatten(array, shallow) {
- var index = -1,
- length = array ? array.length : 0,
- result = [];
-
- while (++index < length) {
- var value = array[index];
-
- // recursively flatten arrays (susceptible to call stack limits)
- if (isArray(value)) {
- push.apply(result, shallow ? value : flatten(value));
- } else {
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Gets the index at which the first occurrence of `value` is found using
- * strict equality for comparisons, i.e. `===`. If the `array` is already
- * sorted, passing `true` for `fromIndex` will run a faster binary search.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to search.
- * @param {Mixed} value The value to search for.
- * @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to
- * perform a binary search on a sorted `array`.
- * @returns {Number} Returns the index of the matched value or `-1`.
- * @example
- *
- * _.indexOf([1, 2, 3, 1, 2, 3], 2);
- * // => 1
- *
- * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
- * // => 4
- *
- * _.indexOf([1, 1, 2, 2, 3, 3], 2, true);
- * // => 2
- */
- function indexOf(array, value, fromIndex) {
- var index = -1,
- length = array ? array.length : 0;
-
- if (typeof fromIndex == 'number') {
- index = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0) - 1;
- } else if (fromIndex) {
- index = sortedIndex(array, value);
- return array[index] === value ? index : -1;
- }
- while (++index < length) {
- if (array[index] === value) {
- return index;
- }
- }
- return -1;
- }
-
- /**
- * Gets all but the last element of `array`. If a number `n` is passed, the
- * last `n` elements are excluded from the result. If a `callback` function
- * is passed, the last elements the `callback` returns truthy for are excluded
- * from the result. The `callback` is bound to `thisArg` and invoked with three
- * arguments; (value, index, array).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to query.
- * @param {Function|Object|Number|String} [callback|n=1] The function called
- * per element or the number of elements to exclude. If a property name or
- * object is passed, it will be used to create a "_.pluck" or "_.where"
- * style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a slice of `array`.
- * @example
- *
- * _.initial([1, 2, 3]);
- * // => [1, 2]
- *
- * _.initial([1, 2, 3], 2);
- * // => [1]
- *
- * _.initial([1, 2, 3], function(num) {
- * return num > 1;
- * });
- * // => [1]
- *
- * var food = [
- * { 'name': 'beet', 'organic': false },
- * { 'name': 'carrot', 'organic': true }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.initial(food, 'organic');
- * // => [{ 'name': 'beet', 'organic': false }]
- *
- * var food = [
- * { 'name': 'banana', 'type': 'fruit' },
- * { 'name': 'beet', 'type': 'vegetable' },
- * { 'name': 'carrot', 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * _.initial(food, { 'type': 'vegetable' });
- * // => [{ 'name': 'banana', 'type': 'fruit' }]
- */
- function initial(array, callback, thisArg) {
- if (!array) {
- return [];
- }
- var n = 0,
- length = array.length;
-
- if (typeof callback != 'number' && callback != null) {
- var index = length;
- callback = createCallback(callback, thisArg);
- while (index-- && callback(array[index], index, array)) {
- n++;
- }
- } else {
- n = (callback == null || thisArg) ? 1 : callback || n;
- }
- return slice(array, 0, nativeMin(nativeMax(0, length - n), length));
- }
-
- /**
- * Computes the intersection of all the passed-in arrays using strict equality
- * for comparisons, i.e. `===`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} [array1, array2, ...] Arrays to process.
- * @returns {Array} Returns a new array of unique elements that are present
- * in **all** of the arrays.
- * @example
- *
- * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
- * // => [1, 2]
- */
- function intersection(array) {
- var args = arguments,
- argsLength = args.length,
- cache = { '0': {} },
- index = -1,
- length = array ? array.length : 0,
- isLarge = length >= 100,
- result = [],
- seen = result;
-
- outer:
- while (++index < length) {
- var value = array[index];
- if (isLarge) {
- var key = value + '';
- var inited = hasOwnProperty.call(cache[0], key)
- ? !(seen = cache[0][key])
- : (seen = cache[0][key] = []);
- }
- if (inited || indexOf(seen, value) < 0) {
- if (isLarge) {
- seen.push(value);
- }
- var argsIndex = argsLength;
- while (--argsIndex) {
- if (!(cache[argsIndex] || (cache[argsIndex] = cachedContains(args[argsIndex], 0, 100)))(value)) {
- continue outer;
+ while (++index < length) {
+ var key = props[index];
+ if (key in object) {
+ result[key] = object[key];
}
}
- result.push(value);
+ } else {
+ callback = createCallback(callback, thisArg);
+ forIn(object, function(value, key, object) {
+ if (callback(value, key, object)) {
+ result[key] = value;
+ }
+ });
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array composed of the own enumerable property values of `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Objects
+ * @param {Object} object The object to inspect.
+ * @returns {Array} Returns a new array of property values.
+ * @example
+ *
+ * _.values({ 'one': 1, 'two': 2, 'three': 3 });
+ * // => [1, 2, 3]
+ */
+ function values(object) {
+ var index = -1,
+ props = keys(object),
+ length = props.length,
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = object[props[index]];
+ }
+ return result;
+ }
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array of elements from the specified indexes, or keys, of the
+ * `collection`. Indexes may be specified as individual arguments or as arrays
+ * of indexes.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Array|Number|String} [index1, index2, ...] The indexes of
+ * `collection` to retrieve, either as individual arguments or arrays.
+ * @returns {Array} Returns a new array of elements corresponding to the
+ * provided indexes.
+ * @example
+ *
+ * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]);
+ * // => ['a', 'c', 'e']
+ *
+ * _.at(['moe', 'larry', 'curly'], 0, 2);
+ * // => ['moe', 'curly']
+ */
+ function at(collection) {
+ var index = -1,
+ props = concat.apply(arrayRef, slice(arguments, 1)),
+ length = props.length,
+ result = Array(length);
+
+ if (noCharByIndex && isString(collection)) {
+ collection = collection.split('');
+ }
+ while(++index < length) {
+ result[index] = collection[props[index]];
+ }
+ return result;
+ }
+
+ /**
+ * Checks if a given `target` element is present in a `collection` using strict
+ * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
+ * as the offset from the end of the collection.
+ *
+ * @static
+ * @memberOf _
+ * @alias include
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Mixed} target The value to check for.
+ * @param {Number} [fromIndex=0] The index to search from.
+ * @returns {Boolean} Returns `true` if the `target` element is found, else `false`.
+ * @example
+ *
+ * _.contains([1, 2, 3], 1);
+ * // => true
+ *
+ * _.contains([1, 2, 3], 1, 2);
+ * // => false
+ *
+ * _.contains({ 'name': 'moe', 'age': 40 }, 'moe');
+ * // => true
+ *
+ * _.contains('curly', 'ur');
+ * // => true
+ */
+ function contains(collection, target, fromIndex) {
+ var index = -1,
+ length = collection ? collection.length : 0,
+ result = false;
+
+ fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0;
+ if (typeof length == 'number') {
+ result = (isString(collection)
+ ? collection.indexOf(target, fromIndex)
+ : indexOf(collection, target, fromIndex)
+ ) > -1;
+ } else {
+ each(collection, function(value) {
+ if (++index >= fromIndex) {
+ return !(result = value === target);
+ }
+ });
+ }
+ return result;
+ }
+
+ /**
+ * Creates an object composed of keys returned from running each element of the
+ * `collection` through the given `callback`. The corresponding value of each key
+ * is the number of times the key was returned by the `callback`. The `callback`
+ * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); });
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+ function countBy(collection, callback, thisArg) {
+ var result = {};
+ callback = createCallback(callback, thisArg);
+
+ forEach(collection, function(value, key, collection) {
+ key = callback(value, key, collection) + '';
+ (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1);
+ });
+ return result;
+ }
+
+ /**
+ * Checks if the `callback` returns a truthy value for **all** elements of a
+ * `collection`. The `callback` is bound to `thisArg` and invoked with three
+ * arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias all
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Boolean} Returns `true` if all elements pass the callback check,
+ * else `false`.
+ * @example
+ *
+ * _.every([true, 1, null, 'yes'], Boolean);
+ * // => false
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.every(stooges, 'age');
+ * // => true
+ *
+ * // using "_.where" callback shorthand
+ * _.every(stooges, { 'age': 50 });
+ * // => false
+ */
+ function every(collection, callback, thisArg) {
+ var result = true;
+ callback = createCallback(callback, thisArg);
+
+ if (isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ while (++index < length) {
+ if (!(result = !!callback(collection[index], index, collection))) {
+ break;
+ }
+ }
+ } else {
+ each(collection, function(value, index, collection) {
+ return (result = !!callback(value, index, collection));
+ });
+ }
+ return result;
+ }
+
+ /**
+ * Examines each element in a `collection`, returning an array of all elements
+ * the `callback` returns truthy for. The `callback` is bound to `thisArg` and
+ * invoked with three arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias select
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array} Returns a new array of elements that passed the callback check.
+ * @example
+ *
+ * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
+ * // => [2, 4, 6]
+ *
+ * var food = [
+ * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
+ * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.filter(food, 'organic');
+ * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
+ *
+ * // using "_.where" callback shorthand
+ * _.filter(food, { 'type': 'fruit' });
+ * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
+ */
+ function filter(collection, callback, thisArg) {
+ var result = [];
+ callback = createCallback(callback, thisArg);
+
+ if (isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ while (++index < length) {
+ var value = collection[index];
+ if (callback(value, index, collection)) {
+ result.push(value);
+ }
+ }
+ } else {
+ each(collection, function(value, index, collection) {
+ if (callback(value, index, collection)) {
+ result.push(value);
+ }
+ });
+ }
+ return result;
+ }
+
+ /**
+ * Examines each element in a `collection`, returning the first that the `callback`
+ * returns truthy for. The `callback` is bound to `thisArg` and invoked with three
+ * arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias detect
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the element that passed the callback check,
+ * else `undefined`.
+ * @example
+ *
+ * var even = _.find([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
+ * // => 2
+ *
+ * var food = [
+ * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
+ * { 'name': 'banana', 'organic': true, 'type': 'fruit' },
+ * { 'name': 'beet', 'organic': false, 'type': 'vegetable' },
+ * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.where" callback shorthand
+ * var veggie = _.find(food, { 'type': 'vegetable' });
+ * // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
+ *
+ * // using "_.pluck" callback shorthand
+ * var healthy = _.find(food, 'organic');
+ * // => { 'name': 'banana', 'organic': true, 'type': 'fruit' }
+ */
+ function find(collection, callback, thisArg) {
+ var result;
+ callback = createCallback(callback, thisArg);
+
+ forEach(collection, function(value, index, collection) {
+ if (callback(value, index, collection)) {
+ result = value;
+ return false;
+ }
+ });
+ return result;
+ }
+
+ /**
+ * Iterates over a `collection`, executing the `callback` for each element in
+ * the `collection`. The `callback` is bound to `thisArg` and invoked with three
+ * arguments; (value, index|key, collection). Callbacks may exit iteration early
+ * by explicitly returning `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias each
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function} [callback=identity] The function called per iteration.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array|Object|String} Returns `collection`.
+ * @example
+ *
+ * _([1, 2, 3]).forEach(alert).join(',');
+ * // => alerts each number and returns '1,2,3'
+ *
+ * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert);
+ * // => alerts each number value (order is not guaranteed)
+ */
+ function forEach(collection, callback, thisArg) {
+ if (callback && typeof thisArg == 'undefined' && isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ while (++index < length) {
+ if (callback(collection[index], index, collection) === false) {
+ break;
+ }
+ }
+ } else {
+ each(collection, callback, thisArg);
+ }
+ return collection;
+ }
+
+ /**
+ * Creates an object composed of keys returned from running each element of the
+ * `collection` through the `callback`. The corresponding value of each key is
+ * an array of elements passed to `callback` that returned the key. The `callback`
+ * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); });
+ * // => { '4': [4.2], '6': [6.1, 6.4] }
+ *
+ * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
+ * // => { '4': [4.2], '6': [6.1, 6.4] }
+ *
+ * // using "_.pluck" callback shorthand
+ * _.groupBy(['one', 'two', 'three'], 'length');
+ * // => { '3': ['one', 'two'], '5': ['three'] }
+ */
+ function groupBy(collection, callback, thisArg) {
+ var result = {};
+ callback = createCallback(callback, thisArg);
+
+ forEach(collection, function(value, key, collection) {
+ key = callback(value, key, collection) + '';
+ (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);
+ });
+ return result;
+ }
+
+ /**
+ * Invokes the method named by `methodName` on each element in the `collection`,
+ * returning an array of the results of each invoked method. Additional arguments
+ * will be passed to each invoked method. If `methodName` is a function, it will
+ * be invoked for, and `this` bound to, each element in the `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|String} methodName The name of the method to invoke or
+ * the function invoked per iteration.
+ * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
+ * @returns {Array} Returns a new array of the results of each invoked method.
+ * @example
+ *
+ * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
+ * // => [[1, 5, 7], [1, 2, 3]]
+ *
+ * _.invoke([123, 456], String.prototype.split, '');
+ * // => [['1', '2', '3'], ['4', '5', '6']]
+ */
+ function invoke(collection, methodName) {
+ var args = slice(arguments, 2),
+ index = -1,
+ isFunc = typeof methodName == 'function',
+ length = collection ? collection.length : 0,
+ result = Array(typeof length == 'number' ? length : 0);
+
+ forEach(collection, function(value) {
+ result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args);
+ });
+ return result;
+ }
+
+ /**
+ * Creates an array of values by running each element in the `collection`
+ * through the `callback`. The `callback` is bound to `thisArg` and invoked with
+ * three arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias collect
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array} Returns a new array of the results of each `callback` execution.
+ * @example
+ *
+ * _.map([1, 2, 3], function(num) { return num * 3; });
+ * // => [3, 6, 9]
+ *
+ * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
+ * // => [3, 6, 9] (order is not guaranteed)
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.map(stooges, 'name');
+ * // => ['moe', 'larry']
+ */
+ function map(collection, callback, thisArg) {
+ var index = -1,
+ length = collection ? collection.length : 0,
+ result = Array(typeof length == 'number' ? length : 0);
+
+ callback = createCallback(callback, thisArg);
+ if (isArray(collection)) {
+ while (++index < length) {
+ result[index] = callback(collection[index], index, collection);
+ }
+ } else {
+ each(collection, function(value, key, collection) {
+ result[++index] = callback(value, key, collection);
+ });
+ }
+ return result;
+ }
+
+ /**
+ * Retrieves the maximum value of an `array`. If `callback` is passed,
+ * it will be executed for each value in the `array` to generate the
+ * criterion by which the value is ranked. The `callback` is bound to
+ * `thisArg` and invoked with three arguments; (value, index, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the maximum value.
+ * @example
+ *
+ * _.max([4, 2, 8, 6]);
+ * // => 8
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * _.max(stooges, function(stooge) { return stooge.age; });
+ * // => { 'name': 'larry', 'age': 50 };
+ *
+ * // using "_.pluck" callback shorthand
+ * _.max(stooges, 'age');
+ * // => { 'name': 'larry', 'age': 50 };
+ */
+ function max(collection, callback, thisArg) {
+ var computed = -Infinity,
+ result = computed;
+
+ if (!callback && isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ while (++index < length) {
+ var value = collection[index];
+ if (value > result) {
+ result = value;
+ }
+ }
+ } else {
+ callback = !callback && isString(collection)
+ ? charAtCallback
+ : createCallback(callback, thisArg);
+
+ each(collection, function(value, index, collection) {
+ var current = callback(value, index, collection);
+ if (current > computed) {
+ computed = current;
+ result = value;
+ }
+ });
+ }
+ return result;
+ }
+
+ /**
+ * Retrieves the minimum value of an `array`. If `callback` is passed,
+ * it will be executed for each value in the `array` to generate the
+ * criterion by which the value is ranked. The `callback` is bound to `thisArg`
+ * and invoked with three arguments; (value, index, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the minimum value.
+ * @example
+ *
+ * _.min([4, 2, 8, 6]);
+ * // => 2
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * _.min(stooges, function(stooge) { return stooge.age; });
+ * // => { 'name': 'moe', 'age': 40 };
+ *
+ * // using "_.pluck" callback shorthand
+ * _.min(stooges, 'age');
+ * // => { 'name': 'moe', 'age': 40 };
+ */
+ function min(collection, callback, thisArg) {
+ var computed = Infinity,
+ result = computed;
+
+ if (!callback && isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ while (++index < length) {
+ var value = collection[index];
+ if (value < result) {
+ result = value;
+ }
+ }
+ } else {
+ callback = !callback && isString(collection)
+ ? charAtCallback
+ : createCallback(callback, thisArg);
+
+ each(collection, function(value, index, collection) {
+ var current = callback(value, index, collection);
+ if (current < computed) {
+ computed = current;
+ result = value;
+ }
+ });
+ }
+ return result;
+ }
+
+ /**
+ * Retrieves the value of a specified property from all elements in the `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {String} property The property to pluck.
+ * @returns {Array} Returns a new array of property values.
+ * @example
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * _.pluck(stooges, 'name');
+ * // => ['moe', 'larry']
+ */
+ var pluck = map;
+
+ /**
+ * Reduces a `collection` to a value that is the accumulated result of running
+ * each element in the `collection` through the `callback`, where each successive
+ * `callback` execution consumes the return value of the previous execution.
+ * If `accumulator` is not passed, the first element of the `collection` will be
+ * used as the initial `accumulator` value. The `callback` is bound to `thisArg`
+ * and invoked with four arguments; (accumulator, value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @alias foldl, inject
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function} [callback=identity] The function called per iteration.
+ * @param {Mixed} [accumulator] Initial value of the accumulator.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the accumulated value.
+ * @example
+ *
+ * var sum = _.reduce([1, 2, 3], function(sum, num) {
+ * return sum + num;
+ * });
+ * // => 6
+ *
+ * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
+ * result[key] = num * 3;
+ * return result;
+ * }, {});
+ * // => { 'a': 3, 'b': 6, 'c': 9 }
+ */
+ function reduce(collection, callback, accumulator, thisArg) {
+ var noaccum = arguments.length < 3;
+ callback = createCallback(callback, thisArg, 4);
+
+ if (isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ if (noaccum) {
+ accumulator = collection[++index];
+ }
+ while (++index < length) {
+ accumulator = callback(accumulator, collection[index], index, collection);
+ }
+ } else {
+ each(collection, function(value, index, collection) {
+ accumulator = noaccum
+ ? (noaccum = false, value)
+ : callback(accumulator, value, index, collection)
+ });
+ }
+ return accumulator;
+ }
+
+ /**
+ * This method is similar to `_.reduce`, except that it iterates over a
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @alias foldr
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function} [callback=identity] The function called per iteration.
+ * @param {Mixed} [accumulator] Initial value of the accumulator.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the accumulated value.
+ * @example
+ *
+ * var list = [[0, 1], [2, 3], [4, 5]];
+ * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
+ * // => [4, 5, 2, 3, 0, 1]
+ */
+ function reduceRight(collection, callback, accumulator, thisArg) {
+ var iterable = collection,
+ length = collection ? collection.length : 0,
+ noaccum = arguments.length < 3;
+
+ if (typeof length != 'number') {
+ var props = keys(collection);
+ length = props.length;
+ } else if (noCharByIndex && isString(collection)) {
+ iterable = collection.split('');
+ }
+ callback = createCallback(callback, thisArg, 4);
+ forEach(collection, function(value, index, collection) {
+ index = props ? props[--length] : --length;
+ accumulator = noaccum
+ ? (noaccum = false, iterable[index])
+ : callback(accumulator, iterable[index], index, collection);
+ });
+ return accumulator;
+ }
+
+ /**
+ * The opposite of `_.filter`, this method returns the elements of a
+ * `collection` that `callback` does **not** return truthy for.
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array} Returns a new array of elements that did **not** pass the
+ * callback check.
+ * @example
+ *
+ * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
+ * // => [1, 3, 5]
+ *
+ * var food = [
+ * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
+ * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.reject(food, 'organic');
+ * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
+ *
+ * // using "_.where" callback shorthand
+ * _.reject(food, { 'type': 'fruit' });
+ * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
+ */
+ function reject(collection, callback, thisArg) {
+ callback = createCallback(callback, thisArg);
+ return filter(collection, function(value, index, collection) {
+ return !callback(value, index, collection);
+ });
+ }
+
+ /**
+ * Creates an array of shuffled `array` values, using a version of the
+ * Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to shuffle.
+ * @returns {Array} Returns a new shuffled collection.
+ * @example
+ *
+ * _.shuffle([1, 2, 3, 4, 5, 6]);
+ * // => [4, 1, 6, 3, 5, 2]
+ */
+ function shuffle(collection) {
+ var index = -1,
+ length = collection ? collection.length : 0,
+ result = Array(typeof length == 'number' ? length : 0);
+
+ forEach(collection, function(value) {
+ var rand = floor(nativeRandom() * (++index + 1));
+ result[index] = result[rand];
+ result[rand] = value;
+ });
+ return result;
+ }
+
+ /**
+ * Gets the size of the `collection` by returning `collection.length` for arrays
+ * and array-like objects or the number of own enumerable properties for objects.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to inspect.
+ * @returns {Number} Returns `collection.length` or number of own enumerable properties.
+ * @example
+ *
+ * _.size([1, 2]);
+ * // => 2
+ *
+ * _.size({ 'one': 1, 'two': 2, 'three': 3 });
+ * // => 3
+ *
+ * _.size('curly');
+ * // => 5
+ */
+ function size(collection) {
+ var length = collection ? collection.length : 0;
+ return typeof length == 'number' ? length : keys(collection).length;
+ }
+
+ /**
+ * Checks if the `callback` returns a truthy value for **any** element of a
+ * `collection`. The function returns as soon as it finds passing value, and
+ * does not iterate over the entire `collection`. The `callback` is bound to
+ * `thisArg` and invoked with three arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias any
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Boolean} Returns `true` if any element passes the callback check,
+ * else `false`.
+ * @example
+ *
+ * _.some([null, 0, 'yes', false], Boolean);
+ * // => true
+ *
+ * var food = [
+ * { 'name': 'apple', 'organic': false, 'type': 'fruit' },
+ * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.some(food, 'organic');
+ * // => true
+ *
+ * // using "_.where" callback shorthand
+ * _.some(food, { 'type': 'meat' });
+ * // => false
+ */
+ function some(collection, callback, thisArg) {
+ var result;
+ callback = createCallback(callback, thisArg);
+
+ if (isArray(collection)) {
+ var index = -1,
+ length = collection.length;
+
+ while (++index < length) {
+ if ((result = callback(collection[index], index, collection))) {
+ break;
+ }
+ }
+ } else {
+ each(collection, function(value, index, collection) {
+ return !(result = callback(value, index, collection));
+ });
+ }
+ return !!result;
+ }
+
+ /**
+ * Creates an array of elements, sorted in ascending order by the results of
+ * running each element in the `collection` through the `callback`. This method
+ * performs a stable sort, that is, it will preserve the original sort order of
+ * equal elements. The `callback` is bound to `thisArg` and invoked with three
+ * arguments; (value, index|key, collection).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array} Returns a new array of sorted elements.
+ * @example
+ *
+ * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); });
+ * // => [3, 1, 2]
+ *
+ * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
+ * // => [3, 1, 2]
+ *
+ * // using "_.pluck" callback shorthand
+ * _.sortBy(['banana', 'strawberry', 'apple'], 'length');
+ * // => ['apple', 'banana', 'strawberry']
+ */
+ function sortBy(collection, callback, thisArg) {
+ var index = -1,
+ length = collection ? collection.length : 0,
+ result = Array(typeof length == 'number' ? length : 0);
+
+ callback = createCallback(callback, thisArg);
+ forEach(collection, function(value, key, collection) {
+ result[++index] = {
+ 'criteria': callback(value, key, collection),
+ 'index': index,
+ 'value': value
+ };
+ });
+
+ length = result.length;
+ result.sort(compareAscending);
+ while (length--) {
+ result[length] = result[length].value;
+ }
+ return result;
+ }
+
+ /**
+ * Converts the `collection` to an array.
+ *
+ * @static
+ * @memberOf _
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to convert.
+ * @returns {Array} Returns the new converted array.
+ * @example
+ *
+ * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
+ * // => [2, 3, 4]
+ */
+ function toArray(collection) {
+ if (collection && typeof collection.length == 'number') {
+ return noCharByIndex && isString(collection)
+ ? collection.split('')
+ : slice(collection);
+ }
+ return values(collection);
+ }
+
+ /**
+ * Examines each element in a `collection`, returning an array of all elements
+ * that have the given `properties`. When checking `properties`, this method
+ * performs a deep comparison between values to determine if they are equivalent
+ * to each other.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Collections
+ * @param {Array|Object|String} collection The collection to iterate over.
+ * @param {Object} properties The object of property values to filter by.
+ * @returns {Array} Returns a new array of elements that have the given `properties`.
+ * @example
+ *
+ * var stooges = [
+ * { 'name': 'moe', 'age': 40 },
+ * { 'name': 'larry', 'age': 50 }
+ * ];
+ *
+ * _.where(stooges, { 'age': 40 });
+ * // => [{ 'name': 'moe', 'age': 40 }]
+ */
+ var where = filter;
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Creates an array with all falsey values of `array` removed. The values
+ * `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to compact.
+ * @returns {Array} Returns a new filtered array.
+ * @example
+ *
+ * _.compact([0, 1, false, 2, '', 3]);
+ * // => [1, 2, 3]
+ */
+ function compact(array) {
+ var index = -1,
+ length = array ? array.length : 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (value) {
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array of `array` elements not present in the other arrays
+ * using strict equality for comparisons, i.e. `===`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to process.
+ * @param {Array} [array1, array2, ...] Arrays to check.
+ * @returns {Array} Returns a new array of `array` elements not present in the
+ * other arrays.
+ * @example
+ *
+ * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
+ * // => [1, 3, 4]
+ */
+ function difference(array) {
+ var index = -1,
+ length = array ? array.length : 0,
+ flattened = concat.apply(arrayRef, arguments),
+ contains = cachedContains(flattened, length),
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (!contains(value)) {
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Gets the first element of the `array`. If a number `n` is passed, the first
+ * `n` elements of the `array` are returned. If a `callback` function is passed,
+ * the first elements the `callback` returns truthy for are returned. The `callback`
+ * is bound to `thisArg` and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias head, take
+ * @category Arrays
+ * @param {Array} array The array to query.
+ * @param {Function|Object|Number|String} [callback|n] The function called
+ * per element or the number of elements to return. If a property name or
+ * object is passed, it will be used to create a "_.pluck" or "_.where"
+ * style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the first element(s) of `array`.
+ * @example
+ *
+ * _.first([1, 2, 3]);
+ * // => 1
+ *
+ * _.first([1, 2, 3], 2);
+ * // => [1, 2]
+ *
+ * _.first([1, 2, 3], function(num) {
+ * return num < 3;
+ * });
+ * // => [1, 2]
+ *
+ * var food = [
+ * { 'name': 'banana', 'organic': true },
+ * { 'name': 'beet', 'organic': false },
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.first(food, 'organic');
+ * // => [{ 'name': 'banana', 'organic': true }]
+ *
+ * var food = [
+ * { 'name': 'apple', 'type': 'fruit' },
+ * { 'name': 'banana', 'type': 'fruit' },
+ * { 'name': 'beet', 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.where" callback shorthand
+ * _.first(food, { 'type': 'fruit' });
+ * // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }]
+ */
+ function first(array, callback, thisArg) {
+ if (array) {
+ var n = 0,
+ length = array.length;
+
+ if (typeof callback != 'number' && callback != null) {
+ var index = -1;
+ callback = createCallback(callback, thisArg);
+ while (++index < length && callback(array[index], index, array)) {
+ n++;
+ }
+ } else {
+ n = callback;
+ if (n == null || thisArg) {
+ return array[0];
+ }
+ }
+ return slice(array, 0, nativeMin(nativeMax(0, n), length));
}
}
- return result;
- }
- /**
- * Gets the last element of the `array`. If a number `n` is passed, the last
- * `n` elements of the `array` are returned. If a `callback` function is passed,
- * the last elements the `callback` returns truthy for are returned. The `callback`
- * is bound to `thisArg` and invoked with three arguments; (value, index, array).
- *
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to query.
- * @param {Function|Object|Number|String} [callback|n] The function called
- * per element or the number of elements to return. If a property name or
- * object is passed, it will be used to create a "_.pluck" or "_.where"
- * style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Mixed} Returns the last element(s) of `array`.
- * @example
- *
- * _.last([1, 2, 3]);
- * // => 3
- *
- * _.last([1, 2, 3], 2);
- * // => [2, 3]
- *
- * _.last([1, 2, 3], function(num) {
- * return num > 1;
- * });
- * // => [2, 3]
- *
- * var food = [
- * { 'name': 'beet', 'organic': false },
- * { 'name': 'carrot', 'organic': true }
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.last(food, 'organic');
- * // => [{ 'name': 'carrot', 'organic': true }]
- *
- * var food = [
- * { 'name': 'banana', 'type': 'fruit' },
- * { 'name': 'beet', 'type': 'vegetable' },
- * { 'name': 'carrot', 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * _.last(food, { 'type': 'vegetable' });
- * // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }]
- */
- function last(array, callback, thisArg) {
- if (array) {
+ /**
+ * Flattens a nested array (the nesting can be to any depth). If `shallow` is
+ * truthy, `array` will only be flattened a single level.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to compact.
+ * @param {Boolean} shallow A flag to indicate only flattening a single level.
+ * @returns {Array} Returns a new flattened array.
+ * @example
+ *
+ * _.flatten([1, [2], [3, [[4]]]]);
+ * // => [1, 2, 3, 4];
+ *
+ * _.flatten([1, [2], [3, [[4]]]], true);
+ * // => [1, 2, 3, [[4]]];
+ */
+ function flatten(array, shallow) {
+ var index = -1,
+ length = array ? array.length : 0,
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+
+ // recursively flatten arrays (susceptible to call stack limits)
+ if (isArray(value)) {
+ push.apply(result, shallow ? value : flatten(value));
+ } else {
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Gets the index at which the first occurrence of `value` is found using
+ * strict equality for comparisons, i.e. `===`. If the `array` is already
+ * sorted, passing `true` for `fromIndex` will run a faster binary search.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to search.
+ * @param {Mixed} value The value to search for.
+ * @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to
+ * perform a binary search on a sorted `array`.
+ * @returns {Number} Returns the index of the matched value or `-1`.
+ * @example
+ *
+ * _.indexOf([1, 2, 3, 1, 2, 3], 2);
+ * // => 1
+ *
+ * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
+ * // => 4
+ *
+ * _.indexOf([1, 1, 2, 2, 3, 3], 2, true);
+ * // => 2
+ */
+ function indexOf(array, value, fromIndex) {
+ var index = -1,
+ length = array ? array.length : 0;
+
+ if (typeof fromIndex == 'number') {
+ index = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0) - 1;
+ } else if (fromIndex) {
+ index = sortedIndex(array, value);
+ return array[index] === value ? index : -1;
+ }
+ while (++index < length) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * Gets all but the last element of `array`. If a number `n` is passed, the
+ * last `n` elements are excluded from the result. If a `callback` function
+ * is passed, the last elements the `callback` returns truthy for are excluded
+ * from the result. The `callback` is bound to `thisArg` and invoked with three
+ * arguments; (value, index, array).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to query.
+ * @param {Function|Object|Number|String} [callback|n=1] The function called
+ * per element or the number of elements to exclude. If a property name or
+ * object is passed, it will be used to create a "_.pluck" or "_.where"
+ * style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array} Returns a slice of `array`.
+ * @example
+ *
+ * _.initial([1, 2, 3]);
+ * // => [1, 2]
+ *
+ * _.initial([1, 2, 3], 2);
+ * // => [1]
+ *
+ * _.initial([1, 2, 3], function(num) {
+ * return num > 1;
+ * });
+ * // => [1]
+ *
+ * var food = [
+ * { 'name': 'beet', 'organic': false },
+ * { 'name': 'carrot', 'organic': true }
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.initial(food, 'organic');
+ * // => [{ 'name': 'beet', 'organic': false }]
+ *
+ * var food = [
+ * { 'name': 'banana', 'type': 'fruit' },
+ * { 'name': 'beet', 'type': 'vegetable' },
+ * { 'name': 'carrot', 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.where" callback shorthand
+ * _.initial(food, { 'type': 'vegetable' });
+ * // => [{ 'name': 'banana', 'type': 'fruit' }]
+ */
+ function initial(array, callback, thisArg) {
+ if (!array) {
+ return [];
+ }
var n = 0,
length = array.length;
@@ -3550,1574 +3455,1703 @@
n++;
}
} else {
- n = callback;
- if (n == null || thisArg) {
- return array[length - 1];
- }
+ n = (callback == null || thisArg) ? 1 : callback || n;
}
- return slice(array, nativeMax(0, length - n));
+ return slice(array, 0, nativeMin(nativeMax(0, length - n), length));
}
- }
- /**
- * Gets the index at which the last occurrence of `value` is found using strict
- * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
- * as the offset from the end of the collection.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to search.
- * @param {Mixed} value The value to search for.
- * @param {Number} [fromIndex=array.length-1] The index to search from.
- * @returns {Number} Returns the index of the matched value or `-1`.
- * @example
- *
- * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
- * // => 4
- *
- * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
- * // => 1
- */
- function lastIndexOf(array, value, fromIndex) {
- var index = array ? array.length : 0;
- if (typeof fromIndex == 'number') {
- index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1;
- }
- while (index--) {
- if (array[index] === value) {
- return index;
- }
- }
- return -1;
- }
-
- /**
- * Creates an object composed from arrays of `keys` and `values`. Pass either
- * a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`, or
- * two arrays, one of `keys` and one of corresponding `values`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} keys The array of keys.
- * @param {Array} [values=[]] The array of values.
- * @returns {Object} Returns an object composed of the given keys and
- * corresponding values.
- * @example
- *
- * _.object(['moe', 'larry'], [30, 40]);
- * // => { 'moe': 30, 'larry': 40 }
- */
- function object(keys, values) {
- var index = -1,
- length = keys ? keys.length : 0,
- result = {};
-
- while (++index < length) {
- var key = keys[index];
- if (values) {
- result[key] = values[index];
- } else {
- result[key[0]] = key[1];
- }
- }
- return result;
- }
-
- /**
- * Creates an array of numbers (positive and/or negative) progressing from
- * `start` up to but not including `end`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Number} [start=0] The start of the range.
- * @param {Number} end The end of the range.
- * @param {Number} [step=1] The value to increment or descrement by.
- * @returns {Array} Returns a new range array.
- * @example
- *
- * _.range(10);
- * // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
- *
- * _.range(1, 11);
- * // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
- *
- * _.range(0, 30, 5);
- * // => [0, 5, 10, 15, 20, 25]
- *
- * _.range(0, -10, -1);
- * // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
- *
- * _.range(0);
- * // => []
- */
- function range(start, end, step) {
- start = +start || 0;
- step = +step || 1;
-
- if (end == null) {
- end = start;
- start = 0;
- }
- // use `Array(length)` so V8 will avoid the slower "dictionary" mode
- // http://youtu.be/XAqIpGU8ZZk#t=17m25s
- var index = -1,
- length = nativeMax(0, ceil((end - start) / step)),
- result = Array(length);
-
- while (++index < length) {
- result[index] = start;
- start += step;
- }
- return result;
- }
-
- /**
- * The opposite of `_.initial`, this method gets all but the first value of `array`.
- * If a number `n` is passed, the first `n` values are excluded from the result.
- * If a `callback` function is passed, the first elements the `callback` returns
- * truthy for are excluded from the result. The `callback` is bound to `thisArg`
- * and invoked with three arguments; (value, index, array).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias drop, tail
- * @category Arrays
- * @param {Array} array The array to query.
- * @param {Function|Object|Number|String} [callback|n=1] The function called
- * per element or the number of elements to exclude. If a property name or
- * object is passed, it will be used to create a "_.pluck" or "_.where"
- * style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a slice of `array`.
- * @example
- *
- * _.rest([1, 2, 3]);
- * // => [2, 3]
- *
- * _.rest([1, 2, 3], 2);
- * // => [3]
- *
- * _.rest([1, 2, 3], function(num) {
- * return num < 3;
- * });
- * // => [3]
- *
- * var food = [
- * { 'name': 'banana', 'organic': true },
- * { 'name': 'beet', 'organic': false },
- * ];
- *
- * // using "_.pluck" callback shorthand
- * _.rest(food, 'organic');
- * // => [{ 'name': 'beet', 'organic': false }]
- *
- * var food = [
- * { 'name': 'apple', 'type': 'fruit' },
- * { 'name': 'banana', 'type': 'fruit' },
- * { 'name': 'beet', 'type': 'vegetable' }
- * ];
- *
- * // using "_.where" callback shorthand
- * _.rest(food, { 'type': 'fruit' });
- * // => [{ 'name': 'beet', 'type': 'vegetable' }]
- */
- function rest(array, callback, thisArg) {
- if (typeof callback != 'number' && callback != null) {
- var n = 0,
- index = -1,
- length = array ? array.length : 0;
-
- callback = createCallback(callback, thisArg);
- while (++index < length && callback(array[index], index, array)) {
- n++;
- }
- } else {
- n = (callback == null || thisArg) ? 1 : nativeMax(0, callback);
- }
- return slice(array, n);
- }
-
- /**
- * Uses a binary search to determine the smallest index at which the `value`
- * should be inserted into `array` in order to maintain the sort order of the
- * sorted `array`. If `callback` is passed, it will be executed for `value` and
- * each element in `array` to compute their sort ranking. The `callback` is
- * bound to `thisArg` and invoked with one argument; (value).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to iterate over.
- * @param {Mixed} value The value to evaluate.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Number} Returns the index at which the value should be inserted
- * into `array`.
- * @example
- *
- * _.sortedIndex([20, 30, 50], 40);
- * // => 2
- *
- * // using "_.pluck" callback shorthand
- * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
- * // => 2
- *
- * var dict = {
- * 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 }
- * };
- *
- * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
- * return dict.wordToNumber[word];
- * });
- * // => 2
- *
- * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
- * return this.wordToNumber[word];
- * }, dict);
- * // => 2
- */
- function sortedIndex(array, value, callback, thisArg) {
- var low = 0,
- high = array ? array.length : low;
-
- // explicitly reference `identity` for better inlining in Firefox
- callback = callback ? createCallback(callback, thisArg, 1) : identity;
- value = callback(value);
-
- while (low < high) {
- var mid = (low + high) >>> 1;
- callback(array[mid]) < value
- ? low = mid + 1
- : high = mid;
- }
- return low;
- }
-
- /**
- * Computes the union of the passed-in arrays using strict equality for
- * comparisons, i.e. `===`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} [array1, array2, ...] Arrays to process.
- * @returns {Array} Returns a new array of unique values, in order, that are
- * present in one or more of the arrays.
- * @example
- *
- * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
- * // => [1, 2, 3, 101, 10]
- */
- function union() {
- return uniq(concat.apply(arrayRef, arguments));
- }
-
- /**
- * Creates a duplicate-value-free version of the `array` using strict equality
- * for comparisons, i.e. `===`. If the `array` is already sorted, passing `true`
- * for `isSorted` will run a faster algorithm. If `callback` is passed, each
- * element of `array` is passed through a callback` before uniqueness is computed.
- * The `callback` is bound to `thisArg` and invoked with three arguments; (value, index, array).
- *
- * If a property name is passed for `callback`, the created "_.pluck" style
- * callback will return the property value of the given element.
- *
- * If an object is passed for `callback`, the created "_.where" style callback
- * will return `true` for elements that have the propeties of the given object,
- * else `false`.
- *
- * @static
- * @memberOf _
- * @alias unique
- * @category Arrays
- * @param {Array} array The array to process.
- * @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted.
- * @param {Function|Object|String} [callback=identity] The function called per
- * iteration. If a property name or object is passed, it will be used to create
- * a "_.pluck" or "_.where" style callback, respectively.
- * @param {Mixed} [thisArg] The `this` binding of `callback`.
- * @returns {Array} Returns a duplicate-value-free array.
- * @example
- *
- * _.uniq([1, 2, 1, 3, 1]);
- * // => [1, 2, 3]
- *
- * _.uniq([1, 1, 2, 2, 3], true);
- * // => [1, 2, 3]
- *
- * _.uniq([1, 2, 1.5, 3, 2.5], function(num) { return Math.floor(num); });
- * // => [1, 2, 3]
- *
- * _.uniq([1, 2, 1.5, 3, 2.5], function(num) { return this.floor(num); }, Math);
- * // => [1, 2, 3]
- *
- * // using "_.pluck" callback shorthand
- * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
- * // => [{ 'x': 1 }, { 'x': 2 }]
- */
- function uniq(array, isSorted, callback, thisArg) {
- var index = -1,
- length = array ? array.length : 0,
- result = [],
- seen = result;
-
- // juggle arguments
- if (typeof isSorted == 'function') {
- thisArg = callback;
- callback = isSorted;
- isSorted = false;
- }
- // init value cache for large arrays
- var isLarge = !isSorted && length >= 75;
- if (isLarge) {
- var cache = {};
- }
- if (callback) {
- seen = [];
- callback = createCallback(callback, thisArg);
- }
- while (++index < length) {
- var value = array[index],
- computed = callback ? callback(value, index, array) : value;
-
- if (isLarge) {
- var key = computed + '';
- var inited = hasOwnProperty.call(cache, key)
- ? !(seen = cache[key])
- : (seen = cache[key] = []);
- }
- if (isSorted
- ? !index || seen[seen.length - 1] !== computed
- : inited || indexOf(seen, computed) < 0
- ) {
- if (callback || isLarge) {
- seen.push(computed);
- }
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Creates an array with all occurrences of the passed values removed using
- * strict equality for comparisons, i.e. `===`.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} array The array to filter.
- * @param {Mixed} [value1, value2, ...] Values to remove.
- * @returns {Array} Returns a new filtered array.
- * @example
- *
- * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
- * // => [2, 3, 4]
- */
- function without(array) {
- var index = -1,
- length = array ? array.length : 0,
- contains = cachedContains(arguments, 1),
- result = [];
-
- while (++index < length) {
- var value = array[index];
- if (!contains(value)) {
- result.push(value);
- }
- }
- return result;
- }
-
- /**
- * Groups the elements of each array at their corresponding indexes. Useful for
- * separate data sources that are coordinated through matching array indexes.
- * For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix
- * in a similar fashion.
- *
- * @static
- * @memberOf _
- * @category Arrays
- * @param {Array} [array1, array2, ...] Arrays to process.
- * @returns {Array} Returns a new array of grouped elements.
- * @example
- *
- * _.zip(['moe', 'larry'], [30, 40], [true, false]);
- * // => [['moe', 30, true], ['larry', 40, false]]
- */
- function zip(array) {
- var index = -1,
- length = array ? max(pluck(arguments, 'length')) : 0,
- result = Array(length);
-
- while (++index < length) {
- result[index] = pluck(arguments, index);
- }
- return result;
- }
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Creates a function that is restricted to executing `func` only after it is
- * called `n` times. The `func` is executed with the `this` binding of the
- * created function.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Number} n The number of times the function must be called before
- * it is executed.
- * @param {Function} func The function to restrict.
- * @returns {Function} Returns the new restricted function.
- * @example
- *
- * var renderNotes = _.after(notes.length, render);
- * _.forEach(notes, function(note) {
- * note.asyncSave({ 'success': renderNotes });
- * });
- * // `renderNotes` is run once, after all notes have saved
- */
- function after(n, func) {
- if (n < 1) {
- return func();
- }
- return function() {
- if (--n < 1) {
- return func.apply(this, arguments);
- }
- };
- }
-
- /**
- * Creates a function that, when called, invokes `func` with the `this`
- * binding of `thisArg` and prepends any additional `bind` arguments to those
- * passed to the bound function.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to bind.
- * @param {Mixed} [thisArg] The `this` binding of `func`.
- * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
- * @returns {Function} Returns the new bound function.
- * @example
- *
- * var func = function(greeting) {
- * return greeting + ' ' + this.name;
- * };
- *
- * func = _.bind(func, { 'name': 'moe' }, 'hi');
- * func();
- * // => 'hi moe'
- */
- function bind(func, thisArg) {
- // use `Function#bind` if it exists and is fast
- // (in V8 `Function#bind` is slower except when partially applied)
- return isBindFast || (nativeBind && arguments.length > 2)
- ? nativeBind.call.apply(nativeBind, arguments)
- : createBound(func, thisArg, slice(arguments, 2));
- }
-
- /**
- * Binds methods on `object` to `object`, overwriting the existing method.
- * Method names may be specified as individual arguments or as arrays of method
- * names. If no method names are provided, all the function properties of `object`
- * will be bound.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Object} object The object to bind and assign the bound methods to.
- * @param {String} [methodName1, methodName2, ...] Method names on the object to bind.
- * @returns {Object} Returns `object`.
- * @example
- *
- * var view = {
- * 'label': 'docs',
- * 'onClick': function() { alert('clicked ' + this.label); }
- * };
- *
- * _.bindAll(view);
- * jQuery('#docs').on('click', view.onClick);
- * // => alerts 'clicked docs', when the button is clicked
- */
- function bindAll(object) {
- var funcs = concat.apply(arrayRef, arguments),
- index = funcs.length > 1 ? 0 : (funcs = functions(object), -1),
- length = funcs.length;
-
- while (++index < length) {
- var key = funcs[index];
- object[key] = bind(object[key], object);
- }
- return object;
- }
-
- /**
- * Creates a function that, when called, invokes the method at `object[key]`
- * and prepends any additional `bindKey` arguments to those passed to the bound
- * function. This method differs from `_.bind` by allowing bound functions to
- * reference methods that will be redefined or don't yet exist.
- * See http://michaux.ca/articles/lazy-function-definition-pattern.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Object} object The object the method belongs to.
- * @param {String} key The key of the method.
- * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
- * @returns {Function} Returns the new bound function.
- * @example
- *
- * var object = {
- * 'name': 'moe',
- * 'greet': function(greeting) {
- * return greeting + ' ' + this.name;
- * }
- * };
- *
- * var func = _.bindKey(object, 'greet', 'hi');
- * func();
- * // => 'hi moe'
- *
- * object.greet = function(greeting) {
- * return greeting + ', ' + this.name + '!';
- * };
- *
- * func();
- * // => 'hi, moe!'
- */
- function bindKey(object, key) {
- return createBound(object, key, slice(arguments, 2));
- }
-
- /**
- * Creates a function that is the composition of the passed functions,
- * where each function consumes the return value of the function that follows.
- * For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`.
- * Each function is executed with the `this` binding of the composed function.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} [func1, func2, ...] Functions to compose.
- * @returns {Function} Returns the new composed function.
- * @example
- *
- * var greet = function(name) { return 'hi ' + name; };
- * var exclaim = function(statement) { return statement + '!'; };
- * var welcome = _.compose(exclaim, greet);
- * welcome('moe');
- * // => 'hi moe!'
- */
- function compose() {
- var funcs = arguments;
- return function() {
+ /**
+ * Computes the intersection of all the passed-in arrays using strict equality
+ * for comparisons, i.e. `===`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} [array1, array2, ...] Arrays to process.
+ * @returns {Array} Returns a new array of unique elements that are present
+ * in **all** of the arrays.
+ * @example
+ *
+ * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
+ * // => [1, 2]
+ */
+ function intersection(array) {
var args = arguments,
+ argsLength = args.length,
+ cache = { '0': {} },
+ index = -1,
+ length = array ? array.length : 0,
+ isLarge = length >= 100,
+ result = [],
+ seen = result;
+
+ outer:
+ while (++index < length) {
+ var value = array[index];
+ if (isLarge) {
+ var key = value + '';
+ var inited = hasOwnProperty.call(cache[0], key)
+ ? !(seen = cache[0][key])
+ : (seen = cache[0][key] = []);
+ }
+ if (inited || indexOf(seen, value) < 0) {
+ if (isLarge) {
+ seen.push(value);
+ }
+ var argsIndex = argsLength;
+ while (--argsIndex) {
+ if (!(cache[argsIndex] || (cache[argsIndex] = cachedContains(args[argsIndex], 0, 100)))(value)) {
+ continue outer;
+ }
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Gets the last element of the `array`. If a number `n` is passed, the last
+ * `n` elements of the `array` are returned. If a `callback` function is passed,
+ * the last elements the `callback` returns truthy for are returned. The `callback`
+ * is bound to `thisArg` and invoked with three arguments; (value, index, array).
+ *
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to query.
+ * @param {Function|Object|Number|String} [callback|n] The function called
+ * per element or the number of elements to return. If a property name or
+ * object is passed, it will be used to create a "_.pluck" or "_.where"
+ * style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Mixed} Returns the last element(s) of `array`.
+ * @example
+ *
+ * _.last([1, 2, 3]);
+ * // => 3
+ *
+ * _.last([1, 2, 3], 2);
+ * // => [2, 3]
+ *
+ * _.last([1, 2, 3], function(num) {
+ * return num > 1;
+ * });
+ * // => [2, 3]
+ *
+ * var food = [
+ * { 'name': 'beet', 'organic': false },
+ * { 'name': 'carrot', 'organic': true }
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.last(food, 'organic');
+ * // => [{ 'name': 'carrot', 'organic': true }]
+ *
+ * var food = [
+ * { 'name': 'banana', 'type': 'fruit' },
+ * { 'name': 'beet', 'type': 'vegetable' },
+ * { 'name': 'carrot', 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.where" callback shorthand
+ * _.last(food, { 'type': 'vegetable' });
+ * // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }]
+ */
+ function last(array, callback, thisArg) {
+ if (array) {
+ var n = 0,
+ length = array.length;
+
+ if (typeof callback != 'number' && callback != null) {
+ var index = length;
+ callback = createCallback(callback, thisArg);
+ while (index-- && callback(array[index], index, array)) {
+ n++;
+ }
+ } else {
+ n = callback;
+ if (n == null || thisArg) {
+ return array[length - 1];
+ }
+ }
+ return slice(array, nativeMax(0, length - n));
+ }
+ }
+
+ /**
+ * Gets the index at which the last occurrence of `value` is found using strict
+ * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
+ * as the offset from the end of the collection.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to search.
+ * @param {Mixed} value The value to search for.
+ * @param {Number} [fromIndex=array.length-1] The index to search from.
+ * @returns {Number} Returns the index of the matched value or `-1`.
+ * @example
+ *
+ * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
+ * // => 4
+ *
+ * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
+ * // => 1
+ */
+ function lastIndexOf(array, value, fromIndex) {
+ var index = array ? array.length : 0;
+ if (typeof fromIndex == 'number') {
+ index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1;
+ }
+ while (index--) {
+ if (array[index] === value) {
+ return index;
+ }
+ }
+ return -1;
+ }
+
+ /**
+ * Creates an object composed from arrays of `keys` and `values`. Pass either
+ * a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`, or
+ * two arrays, one of `keys` and one of corresponding `values`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} keys The array of keys.
+ * @param {Array} [values=[]] The array of values.
+ * @returns {Object} Returns an object composed of the given keys and
+ * corresponding values.
+ * @example
+ *
+ * _.object(['moe', 'larry'], [30, 40]);
+ * // => { 'moe': 30, 'larry': 40 }
+ */
+ function object(keys, values) {
+ var index = -1,
+ length = keys ? keys.length : 0,
+ result = {};
+
+ while (++index < length) {
+ var key = keys[index];
+ if (values) {
+ result[key] = values[index];
+ } else {
+ result[key[0]] = key[1];
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array of numbers (positive and/or negative) progressing from
+ * `start` up to but not including `end`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Number} [start=0] The start of the range.
+ * @param {Number} end The end of the range.
+ * @param {Number} [step=1] The value to increment or descrement by.
+ * @returns {Array} Returns a new range array.
+ * @example
+ *
+ * _.range(10);
+ * // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+ *
+ * _.range(1, 11);
+ * // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+ *
+ * _.range(0, 30, 5);
+ * // => [0, 5, 10, 15, 20, 25]
+ *
+ * _.range(0, -10, -1);
+ * // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
+ *
+ * _.range(0);
+ * // => []
+ */
+ function range(start, end, step) {
+ start = +start || 0;
+ step = +step || 1;
+
+ if (end == null) {
+ end = start;
+ start = 0;
+ }
+ // use `Array(length)` so V8 will avoid the slower "dictionary" mode
+ // http://youtu.be/XAqIpGU8ZZk#t=17m25s
+ var index = -1,
+ length = nativeMax(0, ceil((end - start) / step)),
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = start;
+ start += step;
+ }
+ return result;
+ }
+
+ /**
+ * The opposite of `_.initial`, this method gets all but the first value of `array`.
+ * If a number `n` is passed, the first `n` values are excluded from the result.
+ * If a `callback` function is passed, the first elements the `callback` returns
+ * truthy for are excluded from the result. The `callback` is bound to `thisArg`
+ * and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias drop, tail
+ * @category Arrays
+ * @param {Array} array The array to query.
+ * @param {Function|Object|Number|String} [callback|n=1] The function called
+ * per element or the number of elements to exclude. If a property name or
+ * object is passed, it will be used to create a "_.pluck" or "_.where"
+ * style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array} Returns a slice of `array`.
+ * @example
+ *
+ * _.rest([1, 2, 3]);
+ * // => [2, 3]
+ *
+ * _.rest([1, 2, 3], 2);
+ * // => [3]
+ *
+ * _.rest([1, 2, 3], function(num) {
+ * return num < 3;
+ * });
+ * // => [3]
+ *
+ * var food = [
+ * { 'name': 'banana', 'organic': true },
+ * { 'name': 'beet', 'organic': false },
+ * ];
+ *
+ * // using "_.pluck" callback shorthand
+ * _.rest(food, 'organic');
+ * // => [{ 'name': 'beet', 'organic': false }]
+ *
+ * var food = [
+ * { 'name': 'apple', 'type': 'fruit' },
+ * { 'name': 'banana', 'type': 'fruit' },
+ * { 'name': 'beet', 'type': 'vegetable' }
+ * ];
+ *
+ * // using "_.where" callback shorthand
+ * _.rest(food, { 'type': 'fruit' });
+ * // => [{ 'name': 'beet', 'type': 'vegetable' }]
+ */
+ function rest(array, callback, thisArg) {
+ if (typeof callback != 'number' && callback != null) {
+ var n = 0,
+ index = -1,
+ length = array ? array.length : 0;
+
+ callback = createCallback(callback, thisArg);
+ while (++index < length && callback(array[index], index, array)) {
+ n++;
+ }
+ } else {
+ n = (callback == null || thisArg) ? 1 : nativeMax(0, callback);
+ }
+ return slice(array, n);
+ }
+
+ /**
+ * Uses a binary search to determine the smallest index at which the `value`
+ * should be inserted into `array` in order to maintain the sort order of the
+ * sorted `array`. If `callback` is passed, it will be executed for `value` and
+ * each element in `array` to compute their sort ranking. The `callback` is
+ * bound to `thisArg` and invoked with one argument; (value).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to iterate over.
+ * @param {Mixed} value The value to evaluate.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Number} Returns the index at which the value should be inserted
+ * into `array`.
+ * @example
+ *
+ * _.sortedIndex([20, 30, 50], 40);
+ * // => 2
+ *
+ * // using "_.pluck" callback shorthand
+ * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
+ * // => 2
+ *
+ * var dict = {
+ * 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 }
+ * };
+ *
+ * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
+ * return dict.wordToNumber[word];
+ * });
+ * // => 2
+ *
+ * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
+ * return this.wordToNumber[word];
+ * }, dict);
+ * // => 2
+ */
+ function sortedIndex(array, value, callback, thisArg) {
+ var low = 0,
+ high = array ? array.length : low;
+
+ // explicitly reference `identity` for better inlining in Firefox
+ callback = callback ? createCallback(callback, thisArg, 1) : identity;
+ value = callback(value);
+
+ while (low < high) {
+ var mid = (low + high) >>> 1;
+ callback(array[mid]) < value
+ ? low = mid + 1
+ : high = mid;
+ }
+ return low;
+ }
+
+ /**
+ * Computes the union of the passed-in arrays using strict equality for
+ * comparisons, i.e. `===`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} [array1, array2, ...] Arrays to process.
+ * @returns {Array} Returns a new array of unique values, in order, that are
+ * present in one or more of the arrays.
+ * @example
+ *
+ * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
+ * // => [1, 2, 3, 101, 10]
+ */
+ function union() {
+ return uniq(concat.apply(arrayRef, arguments));
+ }
+
+ /**
+ * Creates a duplicate-value-free version of the `array` using strict equality
+ * for comparisons, i.e. `===`. If the `array` is already sorted, passing `true`
+ * for `isSorted` will run a faster algorithm. If `callback` is passed, each
+ * element of `array` is passed through a callback` before uniqueness is computed.
+ * The `callback` is bound to `thisArg` and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is passed for `callback`, the created "_.pluck" style
+ * callback will return the property value of the given element.
+ *
+ * If an object is passed for `callback`, the created "_.where" style callback
+ * will return `true` for elements that have the propeties of the given object,
+ * else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias unique
+ * @category Arrays
+ * @param {Array} array The array to process.
+ * @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted.
+ * @param {Function|Object|String} [callback=identity] The function called per
+ * iteration. If a property name or object is passed, it will be used to create
+ * a "_.pluck" or "_.where" style callback, respectively.
+ * @param {Mixed} [thisArg] The `this` binding of `callback`.
+ * @returns {Array} Returns a duplicate-value-free array.
+ * @example
+ *
+ * _.uniq([1, 2, 1, 3, 1]);
+ * // => [1, 2, 3]
+ *
+ * _.uniq([1, 1, 2, 2, 3], true);
+ * // => [1, 2, 3]
+ *
+ * _.uniq([1, 2, 1.5, 3, 2.5], function(num) { return Math.floor(num); });
+ * // => [1, 2, 3]
+ *
+ * _.uniq([1, 2, 1.5, 3, 2.5], function(num) { return this.floor(num); }, Math);
+ * // => [1, 2, 3]
+ *
+ * // using "_.pluck" callback shorthand
+ * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }, { 'x': 2 }]
+ */
+ function uniq(array, isSorted, callback, thisArg) {
+ var index = -1,
+ length = array ? array.length : 0,
+ result = [],
+ seen = result;
+
+ // juggle arguments
+ if (typeof isSorted == 'function') {
+ thisArg = callback;
+ callback = isSorted;
+ isSorted = false;
+ }
+ // init value cache for large arrays
+ var isLarge = !isSorted && length >= 75;
+ if (isLarge) {
+ var cache = {};
+ }
+ if (callback) {
+ seen = [];
+ callback = createCallback(callback, thisArg);
+ }
+ while (++index < length) {
+ var value = array[index],
+ computed = callback ? callback(value, index, array) : value;
+
+ if (isLarge) {
+ var key = computed + '';
+ var inited = hasOwnProperty.call(cache, key)
+ ? !(seen = cache[key])
+ : (seen = cache[key] = []);
+ }
+ if (isSorted
+ ? !index || seen[seen.length - 1] !== computed
+ : inited || indexOf(seen, computed) < 0
+ ) {
+ if (callback || isLarge) {
+ seen.push(computed);
+ }
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Creates an array with all occurrences of the passed values removed using
+ * strict equality for comparisons, i.e. `===`.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} array The array to filter.
+ * @param {Mixed} [value1, value2, ...] Values to remove.
+ * @returns {Array} Returns a new filtered array.
+ * @example
+ *
+ * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
+ * // => [2, 3, 4]
+ */
+ function without(array) {
+ var index = -1,
+ length = array ? array.length : 0,
+ contains = cachedContains(arguments, 1),
+ result = [];
+
+ while (++index < length) {
+ var value = array[index];
+ if (!contains(value)) {
+ result.push(value);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Groups the elements of each array at their corresponding indexes. Useful for
+ * separate data sources that are coordinated through matching array indexes.
+ * For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix
+ * in a similar fashion.
+ *
+ * @static
+ * @memberOf _
+ * @category Arrays
+ * @param {Array} [array1, array2, ...] Arrays to process.
+ * @returns {Array} Returns a new array of grouped elements.
+ * @example
+ *
+ * _.zip(['moe', 'larry'], [30, 40], [true, false]);
+ * // => [['moe', 30, true], ['larry', 40, false]]
+ */
+ function zip(array) {
+ var index = -1,
+ length = array ? max(pluck(arguments, 'length')) : 0,
+ result = Array(length);
+
+ while (++index < length) {
+ result[index] = pluck(arguments, index);
+ }
+ return result;
+ }
+
+ /*--------------------------------------------------------------------------*/
+
+ /**
+ * Creates a function that is restricted to executing `func` only after it is
+ * called `n` times. The `func` is executed with the `this` binding of the
+ * created function.
+ *
+ * @static
+ * @memberOf _
+ * @category Functions
+ * @param {Number} n The number of times the function must be called before
+ * it is executed.
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new restricted function.
+ * @example
+ *
+ * var renderNotes = _.after(notes.length, render);
+ * _.forEach(notes, function(note) {
+ * note.asyncSave({ 'success': renderNotes });
+ * });
+ * // `renderNotes` is run once, after all notes have saved
+ */
+ function after(n, func) {
+ if (n < 1) {
+ return func();
+ }
+ return function() {
+ if (--n < 1) {
+ return func.apply(this, arguments);
+ }
+ };
+ }
+
+ /**
+ * Creates a function that, when called, invokes `func` with the `this`
+ * binding of `thisArg` and prepends any additional `bind` arguments to those
+ * passed to the bound function.
+ *
+ * @static
+ * @memberOf _
+ * @category Functions
+ * @param {Function} func The function to bind.
+ * @param {Mixed} [thisArg] The `this` binding of `func`.
+ * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * var func = function(greeting) {
+ * return greeting + ' ' + this.name;
+ * };
+ *
+ * func = _.bind(func, { 'name': 'moe' }, 'hi');
+ * func();
+ * // => 'hi moe'
+ */
+ function bind(func, thisArg) {
+ // use `Function#bind` if it exists and is fast
+ // (in V8 `Function#bind` is slower except when partially applied)
+ return isBindFast || (nativeBind && arguments.length > 2)
+ ? nativeBind.call.apply(nativeBind, arguments)
+ : createBound(func, thisArg, slice(arguments, 2));
+ }
+
+ /**
+ * Binds methods on `object` to `object`, overwriting the existing method.
+ * Method names may be specified as individual arguments or as arrays of method
+ * names. If no method names are provided, all the function properties of `object`
+ * will be bound.
+ *
+ * @static
+ * @memberOf _
+ * @category Functions
+ * @param {Object} object The object to bind and assign the bound methods to.
+ * @param {String} [methodName1, methodName2, ...] Method names on the object to bind.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * var view = {
+ * 'label': 'docs',
+ * 'onClick': function() { alert('clicked ' + this.label); }
+ * };
+ *
+ * _.bindAll(view);
+ * jQuery('#docs').on('click', view.onClick);
+ * // => alerts 'clicked docs', when the button is clicked
+ */
+ function bindAll(object) {
+ var funcs = concat.apply(arrayRef, arguments),
+ index = funcs.length > 1 ? 0 : (funcs = functions(object), -1),
length = funcs.length;
- while (length--) {
- args = [funcs[length].apply(this, args)];
- }
- return args[0];
- };
- }
-
- /**
- * Creates a function that will delay the execution of `func` until after
- * `wait` milliseconds have elapsed since the last time it was invoked. Pass
- * `true` for `immediate` to cause debounce to invoke `func` on the leading,
- * instead of the trailing, edge of the `wait` timeout. Subsequent calls to
- * the debounced function will return the result of the last `func` call.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to debounce.
- * @param {Number} wait The number of milliseconds to delay.
- * @param {Boolean} immediate A flag to indicate execution is on the leading
- * edge of the timeout.
- * @returns {Function} Returns the new debounced function.
- * @example
- *
- * var lazyLayout = _.debounce(calculateLayout, 300);
- * jQuery(window).on('resize', lazyLayout);
- */
- function debounce(func, wait, immediate) {
- var args,
- result,
- thisArg,
- timeoutId;
-
- function delayed() {
- timeoutId = null;
- if (!immediate) {
- result = func.apply(thisArg, args);
+ while (++index < length) {
+ var key = funcs[index];
+ object[key] = bind(object[key], object);
}
+ return object;
}
- return function() {
- var isImmediate = immediate && !timeoutId;
- args = arguments;
- thisArg = this;
- clearTimeout(timeoutId);
- timeoutId = setTimeout(delayed, wait);
-
- if (isImmediate) {
- result = func.apply(thisArg, args);
- }
- return result;
- };
- }
-
- /**
- * Executes the `func` function after `wait` milliseconds. Additional arguments
- * will be passed to `func` when it is invoked.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to delay.
- * @param {Number} wait The number of milliseconds to delay execution.
- * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
- * @returns {Number} Returns the timer id.
- * @example
- *
- * var log = _.bind(console.log, console);
- * _.delay(log, 1000, 'logged later');
- * // => 'logged later' (Appears after one second.)
- */
- function delay(func, wait) {
- var args = slice(arguments, 2);
- return setTimeout(function() { func.apply(undefined, args); }, wait);
- }
-
- /**
- * Defers executing the `func` function until the current call stack has cleared.
- * Additional arguments will be passed to `func` when it is invoked.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to defer.
- * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
- * @returns {Number} Returns the timer id.
- * @example
- *
- * _.defer(function() { alert('deferred'); });
- * // returns from the function before `alert` is called
- */
- function defer(func) {
- var args = slice(arguments, 1);
- return setTimeout(function() { func.apply(undefined, args); }, 1);
- }
- // use `setImmediate` if it's available in Node.js
- if (isV8 && freeModule && typeof setImmediate == 'function') {
- defer = bind(setImmediate, window);
- }
-
- /**
- * Creates a function that memoizes the result of `func`. If `resolver` is
- * passed, it will be used to determine the cache key for storing the result
- * based on the arguments passed to the memoized function. By default, the first
- * argument passed to the memoized function is used as the cache key. The `func`
- * is executed with the `this` binding of the memoized function.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to have its output memoized.
- * @param {Function} [resolver] A function used to resolve the cache key.
- * @returns {Function} Returns the new memoizing function.
- * @example
- *
- * var fibonacci = _.memoize(function(n) {
- * return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);
- * });
- */
- function memoize(func, resolver) {
- var cache = {};
- return function() {
- var key = (resolver ? resolver.apply(this, arguments) : arguments[0]) + '';
- return hasOwnProperty.call(cache, key)
- ? cache[key]
- : (cache[key] = func.apply(this, arguments));
- };
- }
-
- /**
- * Creates a function that is restricted to execute `func` once. Repeat calls to
- * the function will return the value of the first call. The `func` is executed
- * with the `this` binding of the created function.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to restrict.
- * @returns {Function} Returns the new restricted function.
- * @example
- *
- * var initialize = _.once(createApplication);
- * initialize();
- * initialize();
- * // `initialize` executes `createApplication` once
- */
- function once(func) {
- var ran,
- result;
-
- return function() {
- if (ran) {
- return result;
- }
- ran = true;
- result = func.apply(this, arguments);
-
- // clear the `func` variable so the function may be garbage collected
- func = null;
- return result;
- };
- }
-
- /**
- * Creates a function that, when called, invokes `func` with any additional
- * `partial` arguments prepended to those passed to the new function. This
- * method is similar to `_.bind`, except it does **not** alter the `this` binding.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to partially apply arguments to.
- * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
- * @returns {Function} Returns the new partially applied function.
- * @example
- *
- * var greet = function(greeting, name) { return greeting + ' ' + name; };
- * var hi = _.partial(greet, 'hi');
- * hi('moe');
- * // => 'hi moe'
- */
- function partial(func) {
- return createBound(func, slice(arguments, 1));
- }
-
- /**
- * This method is similar to `_.partial`, except that `partial` arguments are
- * appended to those passed to the new function.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to partially apply arguments to.
- * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
- * @returns {Function} Returns the new partially applied function.
- * @example
- *
- * var defaultsDeep = _.partialRight(_.merge, _.defaults);
- *
- * var options = {
- * 'variable': 'data',
- * 'imports': { 'jq': $ }
- * };
- *
- * defaultsDeep(options, _.templateSettings);
- *
- * options.variable
- * // => 'data'
- *
- * options.imports
- * // => { '_': _, 'jq': $ }
- */
- function partialRight(func) {
- return createBound(func, slice(arguments, 1), null, indicatorObject);
- }
-
- /**
- * Creates a function that, when executed, will only call the `func`
- * function at most once per every `wait` milliseconds. If the throttled
- * function is invoked more than once during the `wait` timeout, `func` will
- * also be called on the trailing edge of the timeout. Subsequent calls to the
- * throttled function will return the result of the last `func` call.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Function} func The function to throttle.
- * @param {Number} wait The number of milliseconds to throttle executions to.
- * @returns {Function} Returns the new throttled function.
- * @example
- *
- * var throttled = _.throttle(updatePosition, 100);
- * jQuery(window).on('scroll', throttled);
- */
- function throttle(func, wait) {
- var args,
- result,
- thisArg,
- timeoutId,
- lastCalled = 0;
-
- function trailingCall() {
- lastCalled = new Date;
- timeoutId = null;
- result = func.apply(thisArg, args);
+ /**
+ * Creates a function that, when called, invokes the method at `object[key]`
+ * and prepends any additional `bindKey` arguments to those passed to the bound
+ * function. This method differs from `_.bind` by allowing bound functions to
+ * reference methods that will be redefined or don't yet exist.
+ * See http://michaux.ca/articles/lazy-function-definition-pattern.
+ *
+ * @static
+ * @memberOf _
+ * @category Functions
+ * @param {Object} object The object the method belongs to.
+ * @param {String} key The key of the method.
+ * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * var object = {
+ * 'name': 'moe',
+ * 'greet': function(greeting) {
+ * return greeting + ' ' + this.name;
+ * }
+ * };
+ *
+ * var func = _.bindKey(object, 'greet', 'hi');
+ * func();
+ * // => 'hi moe'
+ *
+ * object.greet = function(greeting) {
+ * return greeting + ', ' + this.name + '!';
+ * };
+ *
+ * func();
+ * // => 'hi, moe!'
+ */
+ function bindKey(object, key) {
+ return createBound(object, key, slice(arguments, 2));
}
- return function() {
- var now = new Date,
- remaining = wait - (now - lastCalled);
- args = arguments;
- thisArg = this;
+ /**
+ * Creates a function that is the composition of the passed functions,
+ * where each function consumes the return value of the function that follows.
+ * For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`.
+ * Each function is executed with the `this` binding of the composed function.
+ *
+ * @static
+ * @memberOf _
+ * @category Functions
+ * @param {Function} [func1, func2, ...] Functions to compose.
+ * @returns {Function} Returns the new composed function.
+ * @example
+ *
+ * var greet = function(name) { return 'hi ' + name; };
+ * var exclaim = function(statement) { return statement + '!'; };
+ * var welcome = _.compose(exclaim, greet);
+ * welcome('moe');
+ * // => 'hi moe!'
+ */
+ function compose() {
+ var funcs = arguments;
+ return function() {
+ var args = arguments,
+ length = funcs.length;
- if (remaining <= 0) {
- clearTimeout(timeoutId);
- timeoutId = null;
- lastCalled = now;
- result = func.apply(thisArg, args);
- }
- else if (!timeoutId) {
- timeoutId = setTimeout(trailingCall, remaining);
- }
- return result;
- };
- }
-
- /**
- * Creates a function that passes `value` to the `wrapper` function as its
- * first argument. Additional arguments passed to the function are appended
- * to those passed to the `wrapper` function. The `wrapper` is executed with
- * the `this` binding of the created function.
- *
- * @static
- * @memberOf _
- * @category Functions
- * @param {Mixed} value The value to wrap.
- * @param {Function} wrapper The wrapper function.
- * @returns {Function} Returns the new function.
- * @example
- *
- * var hello = function(name) { return 'hello ' + name; };
- * hello = _.wrap(hello, function(func) {
- * return 'before, ' + func('moe') + ', after';
- * });
- * hello();
- * // => 'before, hello moe, after'
- */
- function wrap(value, wrapper) {
- return function() {
- var args = [value];
- push.apply(args, arguments);
- return wrapper.apply(this, args);
- };
- }
-
- /*--------------------------------------------------------------------------*/
-
- /**
- * Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their
- * corresponding HTML entities.
- *
- * @static
- * @memberOf _
- * @category Utilities
- * @param {String} string The string to escape.
- * @returns {String} Returns the escaped string.
- * @example
- *
- * _.escape('Moe, Larry & Curly');
- * // => 'Moe, Larry & Curly'
- */
- function escape(string) {
- return string == null ? '' : (string + '').replace(reUnescapedHtml, escapeHtmlChar);
- }
-
- /**
- * This function returns the first argument passed to it.
- *
- * @static
- * @memberOf _
- * @category Utilities
- * @param {Mixed} value Any value.
- * @returns {Mixed} Returns `value`.
- * @example
- *
- * var moe = { 'name': 'moe' };
- * moe === _.identity(moe);
- * // => true
- */
- function identity(value) {
- return value;
- }
-
- /**
- * Adds functions properties of `object` to the `lodash` function and chainable
- * wrapper.
- *
- * @static
- * @memberOf _
- * @category Utilities
- * @param {Object} object The object of function properties to add to `lodash`.
- * @example
- *
- * _.mixin({
- * 'capitalize': function(string) {
- * return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
- * }
- * });
- *
- * _.capitalize('moe');
- * // => 'Moe'
- *
- * _('moe').capitalize();
- * // => 'Moe'
- */
- function mixin(object) {
- forEach(functions(object), function(methodName) {
- var func = lodash[methodName] = object[methodName];
-
- lodash.prototype[methodName] = function() {
- var args = [this.__wrapped__];
- push.apply(args, arguments);
- return new lodash(func.apply(lodash, args));
- };
- });
- }
-
- /**
- * Reverts the '_' variable to its previous value and returns a reference to
- * the `lodash` function.
- *
- * @static
- * @memberOf _
- * @category Utilities
- * @returns {Function} Returns the `lodash` function.
- * @example
- *
- * var lodash = _.noConflict();
- */
- function noConflict() {
- window._ = oldDash;
- return this;
- }
-
- /**
- * Produces a random number between `min` and `max` (inclusive). If only one
- * argument is passed, a number between `0` and the given number will be returned.
- *
- * @static
- * @memberOf _
- * @category Utilities
- * @param {Number} [min=0] The minimum possible value.
- * @param {Number} [max=1] The maximum possible value.
- * @returns {Number} Returns a random number.
- * @example
- *
- * _.random(0, 5);
- * // => a number between 0 and 5
- *
- * _.random(5);
- * // => also a number between 0 and 5
- */
- function random(min, max) {
- if (min == null && max == null) {
- max = 1;
- }
- min = +min || 0;
- if (max == null) {
- max = min;
- min = 0;
- }
- return min + floor(nativeRandom() * ((+max || 0) - min + 1));
- }
-
- /**
- * Resolves the value of `property` on `object`. If `property` is a function,
- * it will be invoked and its result returned, else the property value is
- * returned. If `object` is falsey, then `null` is returned.
- *
- * @static
- * @memberOf _
- * @category Utilities
- * @param {Object} object The object to inspect.
- * @param {String} property The property to get the value of.
- * @returns {Mixed} Returns the resolved value.
- * @example
- *
- * var object = {
- * 'cheese': 'crumpets',
- * 'stuff': function() {
- * return 'nonsense';
- * }
- * };
- *
- * _.result(object, 'cheese');
- * // => 'crumpets'
- *
- * _.result(object, 'stuff');
- * // => 'nonsense'
- */
- function result(object, property) {
- var value = object ? object[property] : undefined;
- return isFunction(value) ? object[property]() : value;
- }
-
- /**
- * A micro-templating method that handles arbitrary delimiters, preserves
- * whitespace, and correctly escapes quotes within interpolated code.
- *
- * Note: In the development build, `_.template` utilizes sourceURLs for easier
- * debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl
- *
- * Note: Lo-Dash may be used in Chrome extensions by either creating a `lodash csp`
- * build and using precompiled templates, or loading Lo-Dash in a sandbox.
- *
- * For more information on precompiling templates see:
- * http://lodash.com/#custom-builds
- *
- * For more information on Chrome extension sandboxes see:
- * http://developer.chrome.com/stable/extensions/sandboxingEval.html
- *
- * @static
- * @memberOf _
- * @category Utilities
- * @param {String} text The template text.
- * @param {Obect} data The data object used to populate the text.
- * @param {Object} options The options object.
- * escape - The "escape" delimiter regexp.
- * evaluate - The "evaluate" delimiter regexp.
- * interpolate - The "interpolate" delimiter regexp.
- * sourceURL - The sourceURL of the template's compiled source.
- * variable - The data object variable name.
- *
- * @returns {Function|String} Returns a compiled function when no `data` object
- * is given, else it returns the interpolated text.
- * @example
- *
- * // using a compiled template
- * var compiled = _.template('hello <%= name %>');
- * compiled({ 'name': 'moe' });
- * // => 'hello moe'
- *
- * var list = '<% _.forEach(people, function(name) { %><%= name %><% }); %>';
- * _.template(list, { 'people': ['moe', 'larry'] });
- * // => 'moelarry'
- *
- * // using the "escape" delimiter to escape HTML in data property values
- * _.template('<%- value %>', { 'value': '