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Use built-in Object.assign if available.

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jdalton
2015-04-10 09:19:39 -07:00
parent 48e3e3e8cb
commit a927bab6b3
1 changed files with 62 additions and 25 deletions
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87
lodash.src.js
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@@ -772,6 +772,7 @@
ceil = Math.ceil,
clearTimeout = context.clearTimeout,
floor = Math.floor,
getOwnPropertySymbols = isNative(getOwnPropertySymbols = Object.getOwnPropertySymbols) && getOwnPropertySymbols,
getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
push = arrayProto.push,
propertyIsEnumerable = objectProto.propertyIsEnumerable,
@@ -793,6 +794,18 @@
return result;
}());
/** Used as `baseAssign`. */
var nativeAssign = (function() {
var object = Object('x'),
func = isNative(func = Object.assign) && func;
// Avoid `Object.assign` in Firefox 34-37 which have an early implementation
// with a slower try/catch behavior. See https://bugzilla.mozilla.org/show_bug.cgi?id=1103344
// for more details.
try { func(object, 'xo'); } catch(e) {}
return !object[1] && func;
}());
/* Native method references for those with the same name as other `lodash` methods. */
var nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
@@ -1747,21 +1760,19 @@
}
/**
* The base implementation of `_.assign` without support for argument juggling,
* multiple sources, and `this` binding `customizer` functions.
* A specialized version of `_.assign` for customizing assigned values without
* support for argument juggling, multiple sources, and `this` binding `customizer`
* functions.
*
* @private
* @param {Object} object The destination object.
* @param {Object} source The source object.
* @param {Function} [customizer] The function to customize assigning values.
* @returns {Object} Returns the destination object.
* @param {Function} customizer The function to customize assigned values.
* @returns {Object} Returns `object`.
*/
function baseAssign(object, source, customizer) {
var props = keys(source);
if (!customizer) {
return baseCopy(source, object, props);
}
function assignWith(object, source, customizer) {
var index = -1,
props = keys(source),
length = props.length;
while (++index < length) {
@@ -1777,6 +1788,21 @@
return object;
}
/**
* The base implementation of `_.assign` without support for argument juggling,
* multiple sources, and `customizer` functions.
*
* @private
* @param {Object} object The destination object.
* @param {Object} source The source object.
* @returns {Object} Returns `object`.
*/
var baseAssign = nativeAssign || function(object, source) {
return source == null
? object
: baseCopy(source, getSymbols(source), baseCopy(source, keys(source), object));
};
/**
* The base implementation of `_.at` without support for string collections
* and individual key arguments.
@@ -1809,15 +1835,13 @@
*
* @private
* @param {Object} source The object to copy properties from.
* @param {Object} [object={}] The object to copy properties to.
* @param {Array} props The property names to copy.
* @param {Object} [object={}] The object to copy properties to.
* @returns {Object} Returns `object`.
*/
function baseCopy(source, object, props) {
if (!props) {
props = object;
object = {};
}
function baseCopy(source, props, object) {
object || (object = {});
var index = -1,
length = props.length;
@@ -1897,7 +1921,7 @@
}
result = initCloneObject(isFunc ? {} : value);
if (!isDeep) {
return baseCopy(value, result, keys(value));
return baseAssign(result, value);
}
} else {
return cloneableTags[tag]
@@ -2536,7 +2560,7 @@
* @param {Function} [customizer] The function to customize merging properties.
* @param {Array} [stackA=[]] Tracks traversed source objects.
* @param {Array} [stackB=[]] Associates values with source counterparts.
* @returns {Object} Returns the destination object.
* @returns {Object} Returns `object`.
*/
function baseMerge(object, source, customizer, stackA, stackB) {
if (!isObject(object)) {
@@ -4114,6 +4138,15 @@
*/
var getLength = baseProperty('length');
/**
* Creates an array of the own symbols of `object`.
*
* @private
* @param {Object} object The object to inspect.
* @returns {Array} Returns the array of symbols.
*/
var getSymbols = getOwnPropertySymbols || constant([]);
/**
* Gets the view, applying any `transforms` to the `start` and `end` positions.
*
@@ -8650,7 +8683,7 @@
* @category Lang
* @param {*} value The value to compare.
* @param {*} other The other value to compare.
* @param {Function} [customizer] The function to customize comparing values.
* @param {Function} [customizer] The function to customize value comparisons.
* @param {*} [thisArg] The `this` binding of `customizer`.
* @returns {boolean} Returns `true` if the values are equivalent, else `false`.
* @example
@@ -8803,7 +8836,7 @@
* @category Lang
* @param {Object} object The object to inspect.
* @param {Object} source The object of property values to match.
* @param {Function} [customizer] The function to customize comparing values.
* @param {Function} [customizer] The function to customize value comparisons.
* @param {*} [thisArg] The `this` binding of `customizer`.
* @returns {boolean} Returns `true` if `object` is a match, else `false`.
* @example
@@ -9152,7 +9185,7 @@
* @category Object
* @param {Object} object The destination object.
* @param {...Object} [sources] The source objects.
* @param {Function} [customizer] The function to customize assigning values.
* @param {Function} [customizer] The function to customize assigned values.
* @param {*} [thisArg] The `this` binding of `customizer`.
* @returns {Object} Returns `object`.
* @example
@@ -9168,7 +9201,11 @@
* defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
* // => { 'user': 'barney', 'age': 36 }
*/
var assign = createAssigner(baseAssign);
var assign = createAssigner(function(object, source, customizer) {
return customizer
? assignWith(object, source, customizer)
: baseAssign(object, source);
});
/**
* Creates an object that inherits from the given `prototype` object. If a
@@ -9209,7 +9246,7 @@
if (guard && isIterateeCall(prototype, properties, guard)) {
properties = null;
}
return properties ? baseCopy(properties, result, keys(properties)) : result;
return properties ? baseAssign(result, properties) : result;
}
/**
@@ -9773,7 +9810,7 @@
* @category Object
* @param {Object} object The destination object.
* @param {...Object} [sources] The source objects.
* @param {Function} [customizer] The function to customize merging properties.
* @param {Function} [customizer] The function to customize assigned values.
* @param {*} [thisArg] The `this` binding of `customizer`.
* @returns {Object} Returns `object`.
* @example
@@ -10745,9 +10782,9 @@
options = otherOptions = null;
}
string = baseToString(string);
options = baseAssign(baseAssign({}, otherOptions || options), settings, assignOwnDefaults);
options = assignWith(baseAssign({}, otherOptions || options), settings, assignOwnDefaults);
var imports = baseAssign(baseAssign({}, options.imports), settings.imports, assignOwnDefaults),
var imports = assignWith(baseAssign({}, options.imports), settings.imports, assignOwnDefaults),
importsKeys = keys(imports),
importsValues = baseValues(imports, importsKeys);