Bump to v3.0.0.

.gitattributes

@@ -0,0 +1 @@
+* text=auto

.gitignore

@@ -0,0 +1,3 @@
+.DS_Store
+*.log
+node_modules

.npmignore

@@ -0,0 +1 @@
+.*

LICENSE.txt

@@ -0,0 +1,22 @@
+Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
+Based on Underscore.js 1.7.0, copyright 2009-2015 Jeremy Ashkenas,
+DocumentCloud and Investigative Reporters & Editors <http://underscorejs.org/>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -0,0 +1,114 @@
+# lodash v3.0.0
+
+The [modern build](https://github.com/lodash/lodash/wiki/Build-Differences) of [lodash](https://lodash.com/) exported as [Node.js](http://nodejs.org/)/[io.js](https://iojs.org/) modules.
+
+Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
+```bash
+$ lodash modularize modern exports=node -o ./
+$ lodash modern -d -o ./index.js
+```
+
+## Installation
+
+Using npm:
+
+```bash
+$ {sudo -H} npm i -g npm
+$ npm i --save lodash
+```
+
+In Node.js/io.js:
+
+```js
+// load the modern build
+var _ = require('lodash');
+// or a method category
+var array = require('lodash/array');
+// or a method
+var chunk = require('lodash/array/chunk');
+```
+
+See the [package source](https://github.com/lodash/lodash/tree/3.0.0-npm) for more details.
+
+**Note:**<br>
+Don’t assign values to the [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` when in the REPL.<br>
+Install [n_](https://www.npmjs.com/package/n_) for a REPL that includes lodash by default.
+
+## Module formats
+
+lodash is also available in a variety of other builds & module formats.
+
+ * npm packages for [modern](https://www.npmjs.com/package/lodash), [compatibility](https://www.npmjs.com/package/lodash-compat), & [per method](https://www.npmjs.com/browse/keyword/lodash-modularized) builds
+ * AMD modules for [modern](https://github.com/lodash/lodash/tree/3.0.0-amd) & [compatibility](https://github.com/lodash/lodash-compat/tree/3.0.0-amd) builds
+ * ES modules for the [modern](https://github.com/lodash/lodash/tree/3.0.0-es) build
+
+## Further Reading
+
+  * [API Documentation](https://lodash.com/docs)
+  * [Build Differences](https://github.com/lodash/lodash/wiki/Build-Differences)
+  * [Changelog](https://github.com/lodash/lodash/wiki/Changelog)
+  * [Release Notes](https://github.com/lodash/lodash/releases)
+  * [Roadmap](https://github.com/lodash/lodash/wiki/Roadmap)
+  * [More Resources](https://github.com/lodash/lodash/wiki/Resources)
+
+## Features *not* in Underscore
+
+ * ~100% [code coverage](https://coveralls.io/r/lodash)
+ * Follows [semantic versioning](http://semver.org/) for releases
+ * [Lazily evaluated](http://filimanjaro.com/blog/2014/introducing-lazy-evaluation/) chaining
+ * [_(…)](https://lodash.com/docs#_) supports intuitive chaining
+ * [_.ary](https://lodash.com/docs#ary) & [_.rearg](https://lodash.com/docs#rearg) to change function argument limits & order
+ * [_.at](https://lodash.com/docs#at) for cherry-picking collection values
+ * [_.attempt](https://lodash.com/docs#attempt) to execute functions which may error without a try-catch
+ * [_.before](https://lodash.com/docs#before) to complement [_.after](https://lodash.com/docs#after)
+ * [_.bindKey](https://lodash.com/docs#bindKey) for binding [*“lazy”*](http://michaux.ca/articles/lazy-function-definition-pattern) defined methods
+ * [_.chunk](https://lodash.com/docs#chunk) for splitting an array into chunks of a given size
+ * [_.clone](https://lodash.com/docs#clone) supports shallow cloning of `Date` & `RegExp` objects
+ * [_.cloneDeep](https://lodash.com/docs#cloneDeep) for deep cloning arrays & objects
+ * [_.create](https://lodash.com/docs#create) for easier object inheritance
+ * [_.curry](https://lodash.com/docs#curry) & [_.curryRight](https://lodash.com/docs#curryRight) for creating [curried](http://hughfdjackson.com/javascript/why-curry-helps/) functions
+ * [_.debounce](https://lodash.com/docs#debounce) & [_.throttle](https://lodash.com/docs#throttle) are cancelable & accept options for more control
+ * [_.findIndex](https://lodash.com/docs#findIndex) & [_.findKey](https://lodash.com/docs#findKey) for finding indexes & keys
+ * [_.flow](https://lodash.com/docs#flow) to complement [_.flowRight](https://lodash.com/docs#flowRight) (a.k.a `_.backflow` & `_.compose`)
+ * [_.forEach](https://lodash.com/docs#forEach) supports exiting early
+ * [_.forIn](https://lodash.com/docs#forIn) for iterating all enumerable properties
+ * [_.forOwn](https://lodash.com/docs#forOwn) for iterating own properties
+ * [_.includes](https://lodash.com/docs#includes) accepts a `fromIndex`
+ * [_.isError](https://lodash.com/docs#isError) to check for error objects
+ * [_.isNative](https://lodash.com/docs#isNative) to check for native functions
+ * [_.isPlainObject](https://lodash.com/docs#isPlainObject) & [_.toPlainObject](https://lodash.com/docs#toPlainObject) to check for & convert to `Object` objects
+ * [_.isTypedArray](https://lodash.com/docs#isTypedArray) to check for typed arrays
+ * [_.keysIn](https://lodash.com/docs#keysIn) & [_.valuesIn](https://lodash.com/docs#valuesIn) for getting keys & values of all enumerable properties
+ * [_.mapValues](https://lodash.com/docs#mapValues) for [mapping](https://lodash.com/docs#map) values to an object
+ * [_.matches](https://lodash.com/docs#matches) supports deep object comparisons
+ * [_.merge](https://lodash.com/docs#merge) for a deep [_.extend](https://lodash.com/docs#extend)
+ * [_.parseInt](https://lodash.com/docs#parseInt) for consistent cross-environment behavior
+ * [_.propertyOf](https://lodash.com/docs#propertyOf) to complement [_.property](https://lodash.com/docs#property)
+ * [_.pull](https://lodash.com/docs#pull), [_.pullAt](https://lodash.com/docs#pullAt), & [_.remove](https://lodash.com/docs#remove) for mutating arrays
+ * [_.random](https://lodash.com/docs#random) supports returning floating-point numbers
+ * [_.runInContext](https://lodash.com/docs#runInContext) for collisionless mixins & easier mocking
+ * [_.slice](https://lodash.com/docs#slice) for creating subsets of array-like values
+ * [_.sortByAll](https://lodash.com/docs#sortBy) for sorting by multiple properties
+ * [_.support](https://lodash.com/docs#support) for flagging environment features
+ * [_.template](https://lodash.com/docs#template) supports [*“imports”*](https://lodash.com/docs#templateSettings-imports) options & [ES template delimiters](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-template-literal-lexical-components)
+ * [_.transform](https://lodash.com/docs#transform) as a powerful alternative to [_.reduce](https://lodash.com/docs#reduce) for transforming objects
+ * [_.thru](https://lodash.com/docs#thru) to pass values thru method chains
+ * [_.xor](https://lodash.com/docs#xor) to complement [_.difference](https://lodash.com/docs#difference), [_.intersection](https://lodash.com/docs#intersection), & [_.union](https://lodash.com/docs#union)
+ * [_.bind](https://lodash.com/docs#bind), [_.curry](https://lodash.com/docs#curry), [_.partial](https://lodash.com/docs#partial), &
+   [more](https://lodash.com/docs "_.bindKey, _.curryRight, _.partialRight") support customizable argument placeholders
+ * [_.capitalize](https://lodash.com/docs#capitalize), [_.trim](https://lodash.com/docs#trim), &
+   [more](https://lodash.com/docs "_.camelCase, _.deburr, _.endsWith, _.escapeRegExp, _.kebabCase, _.pad, _.padLeft, _.padRight, _.repeat, _.snakeCase, _.startsWith, _.trimLeft, _.trimRight, _.trunc, _.words") string methods
+ * [_.clone](https://lodash.com/docs#clone), [_.isEqual](https://lodash.com/docs#isEqual), &
+   [more](https://lodash.com/docs "_.assign, _.cloneDeep, _.merge") accept callbacks
+ * [_.dropWhile](https://lodash.com/docs#dropWhile), [_.takeWhile](https://lodash.com/docs#takeWhile), &
+   [more](https://lodash.com/docs "_.drop, _.dropRightWhile, _.take, _.takeRightWhile") to complement [_.first](https://lodash.com/docs#first), [_.initial](https://lodash.com/docs#initial), [_.last](https://lodash.com/docs#last), & [_.rest](https://lodash.com/docs#rest)
+ * [_.findLast](https://lodash.com/docs#findLast), [_.findLastIndex](https://lodash.com/docs#findLastIndex), &
+   [more](https://lodash.com/docs "_.findLastKey, _.flowRight, _.forEachRight, _.forInRight, _.forOwnRight, _.partialRight") right-associative methods
+ * [_.includes](https://lodash.com/docs#includes), [_.toArray](https://lodash.com/docs#toArray), &
+   [more](https://lodash.com/docs "_.at, _.countBy, _.every, _.filter, _.find, _.findLast, _.forEach, _.forEachRight, _.groupBy, _.indexBy, _.invoke, _.map, _.max, _.min, _.partition, _.pluck, _.reduce, _.reduceRight, _.reject, _.shuffle, _.size, _.some, _.sortBy") accept strings
+
+## Support
+
+Tested in Chrome 39-40, Firefox 34-35, IE 6-11, Opera 25-26, Safari 5-8, io.js 1.0.4, Node.js 0.8.28 & 0.10.35, PhantomJS 1.9.8, RingoJS 0.11, & Rhino 1.7RC5.
+
+Automated [browser](https://saucelabs.com/u/lodash) & [CI](https://travis-ci.org/lodash/lodash/) test runs are available. Special thanks to [Sauce Labs](https://saucelabs.com/) for providing automated browser testing.

array.js

@@ -0,0 +1,41 @@
+module.exports = {
+  'chunk': require('./array/chunk'),
+  'compact': require('./array/compact'),
+  'difference': require('./array/difference'),
+  'drop': require('./array/drop'),
+  'dropRight': require('./array/dropRight'),
+  'dropRightWhile': require('./array/dropRightWhile'),
+  'dropWhile': require('./array/dropWhile'),
+  'findIndex': require('./array/findIndex'),
+  'findLastIndex': require('./array/findLastIndex'),
+  'first': require('./array/first'),
+  'flatten': require('./array/flatten'),
+  'flattenDeep': require('./array/flattenDeep'),
+  'head': require('./array/head'),
+  'indexOf': require('./array/indexOf'),
+  'initial': require('./array/initial'),
+  'intersection': require('./array/intersection'),
+  'last': require('./array/last'),
+  'lastIndexOf': require('./array/lastIndexOf'),
+  'object': require('./array/object'),
+  'pull': require('./array/pull'),
+  'pullAt': require('./array/pullAt'),
+  'remove': require('./array/remove'),
+  'rest': require('./array/rest'),
+  'slice': require('./array/slice'),
+  'sortedIndex': require('./array/sortedIndex'),
+  'sortedLastIndex': require('./array/sortedLastIndex'),
+  'tail': require('./array/tail'),
+  'take': require('./array/take'),
+  'takeRight': require('./array/takeRight'),
+  'takeRightWhile': require('./array/takeRightWhile'),
+  'takeWhile': require('./array/takeWhile'),
+  'union': require('./array/union'),
+  'uniq': require('./array/uniq'),
+  'unique': require('./array/unique'),
+  'unzip': require('./array/unzip'),
+  'without': require('./array/without'),
+  'xor': require('./array/xor'),
+  'zip': require('./array/zip'),
+  'zipObject': require('./array/zipObject')
+};

array/chunk.js

@@ -0,0 +1,47 @@
+var baseSlice = require('../internal/baseSlice'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/** Native method references. */
+var ceil = Math.ceil;
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * Creates an array of elements split into groups the length of `size`.
+ * If `collection` can't be split evenly, the final chunk will be the remaining
+ * elements.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to process.
+ * @param {numer} [size=1] The length of each chunk.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the new array containing chunks.
+ * @example
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 2);
+ * // => [['a', 'b'], ['c', 'd']]
+ *
+ * _.chunk(['a', 'b', 'c', 'd'], 3);
+ * // => [['a', 'b', 'c'], ['d']]
+ */
+function chunk(array, size, guard) {
+  if (guard ? isIterateeCall(array, size, guard) : size == null) {
+    size = 1;
+  } else {
+    size = nativeMax(+size || 1, 1);
+  }
+  var index = 0,
+      length = array ? array.length : 0,
+      resIndex = -1,
+      result = Array(ceil(length / size));
+
+  while (index < length) {
+    result[++resIndex] = baseSlice(array, index, (index += size));
+  }
+  return result;
+}
+
+module.exports = chunk;

array/compact.js

@@ -0,0 +1,30 @@
+/**
+ * Creates an array with all falsey values removed. The values `false`, `null`,
+ * `0`, `""`, `undefined`, and `NaN` are falsey.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to compact.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.compact([0, 1, false, 2, '', 3]);
+ * // => [1, 2, 3]
+ */
+function compact(array) {
+  var index = -1,
+      length = array ? array.length : 0,
+      resIndex = -1,
+      result = [];
+
+  while (++index < length) {
+    var value = array[index];
+    if (value) {
+      result[++resIndex] = value;
+    }
+  }
+  return result;
+}
+
+module.exports = compact;

array/difference.js

@@ -0,0 +1,39 @@
+var baseDifference = require('../internal/baseDifference'),
+    baseFlatten = require('../internal/baseFlatten'),
+    isArguments = require('../lang/isArguments'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Creates an array excluding all values of the provided arrays using
+ * `SameValueZero` for equality comparisons.
+ *
+ * **Note:** `SameValueZero` comparisons are like strict equality comparisons,
+ * e.g. `===`, except that `NaN` matches `NaN`. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {...Array} [values] The arrays of values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.difference([1, 2, 3], [5, 2, 10]);
+ * // => [1, 3]
+ */
+function difference() {
+  var index = -1,
+      length = arguments.length;
+
+  while (++index < length) {
+    var value = arguments[index];
+    if (isArray(value) || isArguments(value)) {
+      break;
+    }
+  }
+  return baseDifference(value, baseFlatten(arguments, false, true, ++index));
+}
+
+module.exports = difference;

array/drop.js

@@ -0,0 +1,40 @@
+var baseSlice = require('../internal/baseSlice'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/**
+ * Creates a slice of `array` with `n` elements dropped from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.drop([1, 2, 3]);
+ * // => [2, 3]
+ *
+ * _.drop([1, 2, 3], 2);
+ * // => [3]
+ *
+ * _.drop([1, 2, 3], 5);
+ * // => []
+ *
+ * _.drop([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+function drop(array, n, guard) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  if (guard ? isIterateeCall(array, n, guard) : n == null) {
+    n = 1;
+  }
+  return baseSlice(array, n < 0 ? 0 : n);
+}
+
+module.exports = drop;

array/dropRight.js

@@ -0,0 +1,41 @@
+var baseSlice = require('../internal/baseSlice'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/**
+ * Creates a slice of `array` with `n` elements dropped from the end.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to drop.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.dropRight([1, 2, 3]);
+ * // => [1, 2]
+ *
+ * _.dropRight([1, 2, 3], 2);
+ * // => [1]
+ *
+ * _.dropRight([1, 2, 3], 5);
+ * // => []
+ *
+ * _.dropRight([1, 2, 3], 0);
+ * // => [1, 2, 3]
+ */
+function dropRight(array, n, guard) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  if (guard ? isIterateeCall(array, n, guard) : n == null) {
+    n = 1;
+  }
+  n = length - (+n || 0);
+  return baseSlice(array, 0, n < 0 ? 0 : n);
+}
+
+module.exports = dropRight;

array/dropRightWhile.js

@@ -0,0 +1,54 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseSlice = require('../internal/baseSlice');
+
+/**
+ * Creates a slice of `array` excluding elements dropped from the end.
+ * Elements are dropped until `predicate` returns falsey. The predicate is
+ * bound to `thisArg` and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per element.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.dropRightWhile([1, 2, 3], function(n) { return n > 1; });
+ * // => [1]
+ *
+ * var users = [
+ *   { 'user': 'barney',  'status': 'busy', 'active': false },
+ *   { 'user': 'fred',    'status': 'busy', 'active': true },
+ *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.pluck(_.dropRightWhile(users, 'active'), 'user');
+ * // => ['barney']
+ *
+ * // using the "_.matches" callback shorthand
+ * _.pluck(_.dropRightWhile(users, { 'status': 'away' }), 'user');
+ * // => ['barney', 'fred']
+ */
+function dropRightWhile(array, predicate, thisArg) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  predicate = baseCallback(predicate, thisArg, 3);
+  while (length-- && predicate(array[length], length, array)) {}
+  return baseSlice(array, 0, length + 1);
+}
+
+module.exports = dropRightWhile;

array/dropWhile.js

@@ -0,0 +1,55 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseSlice = require('../internal/baseSlice');
+
+/**
+ * Creates a slice of `array` excluding elements dropped from the beginning.
+ * Elements are dropped until `predicate` returns falsey. The predicate is
+ * bound to `thisArg` and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per element.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.dropWhile([1, 2, 3], function(n) { return n < 3; });
+ * // => [3]
+ *
+ * var users = [
+ *   { 'user': 'barney',  'status': 'busy', 'active': true },
+ *   { 'user': 'fred',    'status': 'busy', 'active': false },
+ *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.pluck(_.dropWhile(users, 'active'), 'user');
+ * // => ['fred', 'pebbles']
+ *
+ * // using the "_.matches" callback shorthand
+ * _.pluck(_.dropWhile(users, { 'status': 'busy' }), 'user');
+ * // => ['pebbles']
+ */
+function dropWhile(array, predicate, thisArg) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  var index = -1;
+  predicate = baseCallback(predicate, thisArg, 3);
+  while (++index < length && predicate(array[index], index, array)) {}
+  return baseSlice(array, index);
+}
+
+module.exports = dropWhile;

array/findIndex.js

@@ -0,0 +1,55 @@
+var baseCallback = require('../internal/baseCallback');
+
+/**
+ * This method is like `_.find` except that it returns the index of the first
+ * element `predicate` returns truthy for, instead of the element itself.
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {number} Returns the index of the found element, else `-1`.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney',  'age': 36, 'active': false },
+ *   { 'user': 'fred',    'age': 40, 'active': true },
+ *   { 'user': 'pebbles', 'age': 1,  'active': false }
+ * ];
+ *
+ * _.findIndex(users, function(chr) { return chr.age < 40; });
+ * // => 0
+ *
+ * // using the "_.matches" callback shorthand
+ * _.findIndex(users, { 'age': 1 });
+ * // => 2
+ *
+ * // using the "_.property" callback shorthand
+ * _.findIndex(users, 'active');
+ * // => 1
+ */
+function findIndex(array, predicate, thisArg) {
+  var index = -1,
+      length = array ? array.length : 0;
+
+  predicate = baseCallback(predicate, thisArg, 3);
+  while (++index < length) {
+    if (predicate(array[index], index, array)) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+module.exports = findIndex;

array/findLastIndex.js

@@ -0,0 +1,53 @@
+var baseCallback = require('../internal/baseCallback');
+
+/**
+ * This method is like `_.findIndex` except that it iterates over elements
+ * of `collection` from right to left.
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {number} Returns the index of the found element, else `-1`.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney',  'age': 36, 'active': true },
+ *   { 'user': 'fred',    'age': 40, 'active': false },
+ *   { 'user': 'pebbles', 'age': 1,  'active': false }
+ * ];
+ *
+ * _.findLastIndex(users, function(chr) { return chr.age < 40; });
+ * // => 2
+ *
+ * // using the "_.matches" callback shorthand
+ * _.findLastIndex(users, { 'age': 40 });
+ * // => 1
+ *
+ * // using the "_.property" callback shorthand
+ * _.findLastIndex(users, 'active');
+ * // => 0
+ */
+function findLastIndex(array, predicate, thisArg) {
+  var length = array ? array.length : 0;
+  predicate = baseCallback(predicate, thisArg, 3);
+  while (length--) {
+    if (predicate(array[length], length, array)) {
+      return length;
+    }
+  }
+  return -1;
+}
+
+module.exports = findLastIndex;

array/first.js

@@ -0,0 +1,22 @@
+/**
+ * Gets the first element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @alias head
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the first element of `array`.
+ * @example
+ *
+ * _.first([1, 2, 3]);
+ * // => 1
+ *
+ * _.first([]);
+ * // => undefined
+ */
+function first(array) {
+  return array ? array[0] : undefined;
+}
+
+module.exports = first;

array/flatten.js

@@ -0,0 +1,32 @@
+var baseFlatten = require('../internal/baseFlatten'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/**
+ * Flattens a nested array. If `isDeep` is `true` the array is recursively
+ * flattened, otherwise it is only flattened a single level.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @param {boolean} [isDeep] Specify a deep flatten.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flatten([1, [2], [3, [[4]]]]);
+ * // => [1, 2, 3, [[4]]];
+ *
+ * // using `isDeep`
+ * _.flatten([1, [2], [3, [[4]]]], true);
+ * // => [1, 2, 3, 4];
+ */
+function flatten(array, isDeep, guard) {
+  var length = array ? array.length : 0;
+  if (guard && isIterateeCall(array, isDeep, guard)) {
+    isDeep = false;
+  }
+  return length ? baseFlatten(array, isDeep) : [];
+}
+
+module.exports = flatten;

array/flattenDeep.js

@@ -0,0 +1,21 @@
+var baseFlatten = require('../internal/baseFlatten');
+
+/**
+ * Recursively flattens a nested array.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to recursively flatten.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * _.flattenDeep([1, [2], [3, [[4]]]]);
+ * // => [1, 2, 3, 4];
+ */
+function flattenDeep(array) {
+  var length = array ? array.length : 0;
+  return length ? baseFlatten(array, true) : [];
+}
+
+module.exports = flattenDeep;

array/head.js

@@ -0,0 +1 @@
+module.exports = require('./first');

array/indexOf.js

@@ -0,0 +1,55 @@
+var baseIndexOf = require('../internal/baseIndexOf'),
+    binaryIndex = require('../internal/binaryIndex');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * Gets the index at which the first occurrence of `value` is found in `array`
+ * using `SameValueZero` for equality comparisons. If `fromIndex` is negative,
+ * it is used as the offset from the end of `array`. If `array` is sorted
+ * providing `true` for `fromIndex` performs a faster binary search.
+ *
+ * **Note:** `SameValueZero` comparisons are like strict equality comparisons,
+ * e.g. `===`, except that `NaN` matches `NaN`. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {*} 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, else `-1`.
+ * @example
+ *
+ * _.indexOf([1, 2, 3, 1, 2, 3], 2);
+ * // => 1
+ *
+ * // using `fromIndex`
+ * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
+ * // => 4
+ *
+ * // performing a binary search
+ * _.indexOf([4, 4, 5, 5, 6, 6], 5, true);
+ * // => 2
+ */
+function indexOf(array, value, fromIndex) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return -1;
+  }
+  if (typeof fromIndex == 'number') {
+    fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0);
+  } else if (fromIndex) {
+    var index = binaryIndex(array, value),
+        other = array[index];
+
+    return (value === value ? value === other : other !== other) ? index : -1;
+  }
+  return baseIndexOf(array, value, fromIndex);
+}
+
+module.exports = indexOf;

array/initial.js

@@ -0,0 +1,20 @@
+var dropRight = require('./dropRight');
+
+/**
+ * Gets all but the last element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.initial([1, 2, 3]);
+ * // => [1, 2]
+ */
+function initial(array) {
+  return dropRight(array, 1);
+}
+
+module.exports = initial;

array/intersection.js

@@ -0,0 +1,68 @@
+var baseIndexOf = require('../internal/baseIndexOf'),
+    cacheIndexOf = require('../internal/cacheIndexOf'),
+    createCache = require('../internal/createCache'),
+    isArguments = require('../lang/isArguments'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Creates an array of unique values in all provided arrays using `SameValueZero`
+ * for equality comparisons.
+ *
+ * **Note:** `SameValueZero` comparisons are like strict equality comparisons,
+ * e.g. `===`, except that `NaN` matches `NaN`. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of shared values.
+ * @example
+ *
+ * _.intersection([1, 2, 3], [5, 2, 1, 4], [2, 1]);
+ * // => [1, 2]
+ */
+function intersection() {
+  var args = [],
+      argsIndex = -1,
+      argsLength = arguments.length,
+      caches = [],
+      indexOf = baseIndexOf,
+      isCommon = true;
+
+  while (++argsIndex < argsLength) {
+    var value = arguments[argsIndex];
+    if (isArray(value) || isArguments(value)) {
+      args.push(value);
+      caches.push(isCommon && value.length >= 120 && createCache(argsIndex && value));
+    }
+  }
+  argsLength = args.length;
+  var array = args[0],
+      index = -1,
+      length = array ? array.length : 0,
+      result = [],
+      seen = caches[0];
+
+  outer:
+  while (++index < length) {
+    value = array[index];
+    if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value)) < 0) {
+      argsIndex = argsLength;
+      while (--argsIndex) {
+        var cache = caches[argsIndex];
+        if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) {
+          continue outer;
+        }
+      }
+      if (seen) {
+        seen.push(value);
+      }
+      result.push(value);
+    }
+  }
+  return result;
+}
+
+module.exports = intersection;

array/last.js

@@ -0,0 +1,19 @@
+/**
+ * Gets the last element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {*} Returns the last element of `array`.
+ * @example
+ *
+ * _.last([1, 2, 3]);
+ * // => 3
+ */
+function last(array) {
+  var length = array ? array.length : 0;
+  return length ? array[length - 1] : undefined;
+}
+
+module.exports = last;

array/lastIndexOf.js

@@ -0,0 +1,57 @@
+var binaryIndex = require('../internal/binaryIndex'),
+    indexOfNaN = require('../internal/indexOfNaN');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max,
+    nativeMin = Math.min;
+
+/**
+ * This method is like `_.indexOf` except that it iterates over elements of
+ * `array` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {boolean|number} [fromIndex=array.length-1] 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, else `-1`.
+ * @example
+ *
+ * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
+ * // => 4
+ *
+ * // using `fromIndex`
+ * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
+ * // => 1
+ *
+ * // performing a binary search
+ * _.lastIndexOf([4, 4, 5, 5, 6, 6], 5, true);
+ * // => 3
+ */
+function lastIndexOf(array, value, fromIndex) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return -1;
+  }
+  var index = length;
+  if (typeof fromIndex == 'number') {
+    index = (fromIndex < 0 ? nativeMax(length + fromIndex, 0) : nativeMin(fromIndex || 0, length - 1)) + 1;
+  } else if (fromIndex) {
+    index = binaryIndex(array, value, true) - 1;
+    var other = array[index];
+    return (value === value ? value === other : other !== other) ? index : -1;
+  }
+  if (value !== value) {
+    return indexOfNaN(array, index, true);
+  }
+  while (index--) {
+    if (array[index] === value) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+module.exports = lastIndexOf;

array/object.js

@@ -0,0 +1 @@
+module.exports = require('./zipObject');

array/pull.js

@@ -0,0 +1,52 @@
+var baseIndexOf = require('../internal/baseIndexOf');
+
+/** Used for native method references. */
+var arrayProto = Array.prototype;
+
+/** Native method references. */
+var splice = arrayProto.splice;
+
+/**
+ * Removes all provided values from `array` using `SameValueZero` for equality
+ * comparisons.
+ *
+ * **Notes:**
+ *  - Unlike `_.without`, this method mutates `array`.
+ *  - `SameValueZero` comparisons are like strict equality comparisons, e.g. `===`,
+ *    except that `NaN` matches `NaN`. See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ *    for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...*} [values] The values to remove.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [1, 2, 3, 1, 2, 3];
+ * _.pull(array, 2, 3);
+ * console.log(array);
+ * // => [1, 1]
+ */
+function pull() {
+  var array = arguments[0];
+  if (!(array && array.length)) {
+    return array;
+  }
+  var index = 0,
+      indexOf = baseIndexOf,
+      length = arguments.length;
+
+  while (++index < length) {
+    var fromIndex = 0,
+        value = arguments[index];
+
+    while ((fromIndex = indexOf(array, value, fromIndex)) > -1) {
+      splice.call(array, fromIndex, 1);
+    }
+  }
+  return array;
+}
+
+module.exports = pull;

array/pullAt.js

@@ -0,0 +1,33 @@
+var baseFlatten = require('../internal/baseFlatten'),
+    basePullAt = require('../internal/basePullAt');
+
+/**
+ * Removes elements from `array` corresponding to the given indexes and returns
+ * an array of the removed elements. Indexes may be specified as an array of
+ * indexes or as individual arguments.
+ *
+ * **Note:** Unlike `_.at`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {...(number|number[])} [indexes] The indexes of elements to remove,
+ *  specified as individual indexes or arrays of indexes.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = [5, 10, 15, 20];
+ * var evens = _.pullAt(array, [1, 3]);
+ *
+ * console.log(array);
+ * // => [5, 15]
+ *
+ * console.log(evens);
+ * // => [10, 20]
+ */
+function pullAt(array) {
+  return basePullAt(array || [], baseFlatten(arguments, false, false, 1));
+}
+
+module.exports = pullAt;

array/remove.js

@@ -0,0 +1,60 @@
+var baseCallback = require('../internal/baseCallback');
+
+/** Used for native method references. */
+var arrayProto = Array.prototype;
+
+/** Native method references. */
+var splice = arrayProto.splice;
+
+/**
+ * Removes all elements from `array` that `predicate` returns truthy for
+ * and returns an array of the removed elements. The predicate is bound to
+ * `thisArg` and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * **Note:** Unlike `_.filter`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the new array of removed elements.
+ * @example
+ *
+ * var array = [1, 2, 3, 4];
+ * var evens = _.remove(array, function(n) { return n % 2 == 0; });
+ *
+ * console.log(array);
+ * // => [1, 3]
+ *
+ * console.log(evens);
+ * // => [2, 4]
+ */
+function remove(array, predicate, thisArg) {
+  var index = -1,
+      length = array ? array.length : 0,
+      result = [];
+
+  predicate = baseCallback(predicate, thisArg, 3);
+  while (++index < length) {
+    var value = array[index];
+    if (predicate(value, index, array)) {
+      result.push(value);
+      splice.call(array, index--, 1);
+      length--;
+    }
+  }
+  return result;
+}
+
+module.exports = remove;

array/rest.js

@@ -0,0 +1,21 @@
+var drop = require('./drop');
+
+/**
+ * Gets all but the first element of `array`.
+ *
+ * @static
+ * @memberOf _
+ * @alias tail
+ * @category Array
+ * @param {Array} array The array to query.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.rest([1, 2, 3]);
+ * // => [2, 3]
+ */
+function rest(array) {
+  return drop(array, 1);
+}
+
+module.exports = rest;

array/slice.js

@@ -0,0 +1,30 @@
+var baseSlice = require('../internal/baseSlice'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/**
+ * Creates a slice of `array` from `start` up to, but not including, `end`.
+ *
+ * **Note:** This function is used instead of `Array#slice` to support node
+ * lists in IE < 9 and to ensure dense arrays are returned.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to slice.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns the slice of `array`.
+ */
+function slice(array, start, end) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
+    start = 0;
+    end = length;
+  }
+  return baseSlice(array, start, end);
+}
+
+module.exports = slice;

array/sortedIndex.js

@@ -0,0 +1,56 @@
+var baseCallback = require('../internal/baseCallback'),
+    binaryIndex = require('../internal/binaryIndex'),
+    binaryIndexBy = require('../internal/binaryIndexBy');
+
+/**
+ * Uses a binary search to determine the lowest index at which `value` should
+ * be inserted into `array` in order to maintain its sort order. If an iteratee
+ * function is provided it is invoked for `value` and each element of `array`
+ * to compute their sort ranking. The iteratee is bound to `thisArg` and
+ * invoked with one argument; (value).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {number} Returns the index at which `value` should be inserted
+ *  into `array`.
+ * @example
+ *
+ * _.sortedIndex([30, 50], 40);
+ * // => 1
+ *
+ * _.sortedIndex([4, 4, 5, 5, 6, 6], 5);
+ * // => 2
+ *
+ * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } };
+ *
+ * // using an iteratee function
+ * _.sortedIndex(['thirty', 'fifty'], 'forty', function(word) {
+ *   return this.data[word];
+ * }, dict);
+ * // => 1
+ *
+ * // using the "_.property" callback shorthand
+ * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
+ * // => 1
+ */
+function sortedIndex(array, value, iteratee, thisArg) {
+  return iteratee == null
+    ? binaryIndex(array, value)
+    : binaryIndexBy(array, value, baseCallback(iteratee, thisArg, 1));
+}
+
+module.exports = sortedIndex;

array/sortedLastIndex.js

@@ -0,0 +1,32 @@
+var baseCallback = require('../internal/baseCallback'),
+    binaryIndex = require('../internal/binaryIndex'),
+    binaryIndexBy = require('../internal/binaryIndexBy');
+
+/**
+ * This method is like `_.sortedIndex` except that it returns the highest
+ * index at which `value` should be inserted into `array` in order to
+ * maintain its sort order.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The sorted array to inspect.
+ * @param {*} value The value to evaluate.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {number} Returns the index at which `value` should be inserted
+ *  into `array`.
+ * @example
+ *
+ * _.sortedLastIndex([4, 4, 5, 5, 6, 6], 5);
+ * // => 4
+ */
+function sortedLastIndex(array, value, iteratee, thisArg) {
+  return iteratee == null
+    ? binaryIndex(array, value, true)
+    : binaryIndexBy(array, value, baseCallback(iteratee, thisArg, 1), true);
+}
+
+module.exports = sortedLastIndex;

array/tail.js

@@ -0,0 +1 @@
+module.exports = require('./rest');

array/take.js

@@ -0,0 +1,40 @@
+var baseSlice = require('../internal/baseSlice'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/**
+ * Creates a slice of `array` with `n` elements taken from the beginning.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.take([1, 2, 3]);
+ * // => [1]
+ *
+ * _.take([1, 2, 3], 2);
+ * // => [1, 2]
+ *
+ * _.take([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.take([1, 2, 3], 0);
+ * // => []
+ */
+function take(array, n, guard) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  if (guard ? isIterateeCall(array, n, guard) : n == null) {
+    n = 1;
+  }
+  return baseSlice(array, 0, n < 0 ? 0 : n);
+}
+
+module.exports = take;

array/takeRight.js

@@ -0,0 +1,41 @@
+var baseSlice = require('../internal/baseSlice'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/**
+ * Creates a slice of `array` with `n` elements taken from the end.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {number} [n=1] The number of elements to take.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.takeRight([1, 2, 3]);
+ * // => [3]
+ *
+ * _.takeRight([1, 2, 3], 2);
+ * // => [2, 3]
+ *
+ * _.takeRight([1, 2, 3], 5);
+ * // => [1, 2, 3]
+ *
+ * _.takeRight([1, 2, 3], 0);
+ * // => []
+ */
+function takeRight(array, n, guard) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  if (guard ? isIterateeCall(array, n, guard) : n == null) {
+    n = 1;
+  }
+  n = length - (+n || 0);
+  return baseSlice(array, n < 0 ? 0 : n);
+}
+
+module.exports = takeRight;

array/takeRightWhile.js

@@ -0,0 +1,54 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseSlice = require('../internal/baseSlice');
+
+/**
+ * Creates a slice of `array` with elements taken from the end. Elements are
+ * taken until `predicate` returns falsey. The predicate is bound to `thisArg`
+ * and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per element.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.takeRightWhile([1, 2, 3], function(n) { return n > 1; });
+ * // => [2, 3]
+ *
+ * var users = [
+ *   { 'user': 'barney',  'status': 'busy', 'active': false },
+ *   { 'user': 'fred',    'status': 'busy', 'active': true },
+ *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.pluck(_.takeRightWhile(users, 'active'), 'user');
+ * // => ['fred', 'pebbles']
+ *
+ * // using the "_.matches" callback shorthand
+ * _.pluck(_.takeRightWhile(users, { 'status': 'away' }), 'user');
+ * // => ['pebbles']
+ */
+function takeRightWhile(array, predicate, thisArg) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  predicate = baseCallback(predicate, thisArg, 3);
+  while (length-- && predicate(array[length], length, array)) {}
+  return baseSlice(array, length + 1);
+}
+
+module.exports = takeRightWhile;

array/takeWhile.js

@@ -0,0 +1,55 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseSlice = require('../internal/baseSlice');
+
+/**
+ * Creates a slice of `array` with elements taken from the beginning. Elements
+ * are taken until `predicate` returns falsey. The predicate is bound to
+ * `thisArg` and invoked with three arguments; (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Array
+ * @param {Array} array The array to query.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per element.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the slice of `array`.
+ * @example
+ *
+ * _.takeWhile([1, 2, 3], function(n) { return n < 3; });
+ * // => [1, 2]
+ *
+ * var users = [
+ *   { 'user': 'barney',  'status': 'busy', 'active': true },
+ *   { 'user': 'fred',    'status': 'busy', 'active': false },
+ *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.pluck(_.takeWhile(users, 'active'), 'user');
+ * // => ['barney']
+ *
+ * // using the "_.matches" callback shorthand
+ * _.pluck(_.takeWhile(users, { 'status': 'busy' }), 'user');
+ * // => ['barney', 'fred']
+ */
+function takeWhile(array, predicate, thisArg) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  var index = -1;
+  predicate = baseCallback(predicate, thisArg, 3);
+  while (++index < length && predicate(array[index], index, array)) {}
+  return baseSlice(array, 0, index);
+}
+
+module.exports = takeWhile;

array/union.js

@@ -0,0 +1,27 @@
+var baseFlatten = require('../internal/baseFlatten'),
+    baseUniq = require('../internal/baseUniq');
+
+/**
+ * Creates an array of unique values, in order, of the provided arrays using
+ * `SameValueZero` for equality comparisons.
+ *
+ * **Note:** `SameValueZero` comparisons are like strict equality comparisons,
+ * e.g. `===`, except that `NaN` matches `NaN`. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of combined values.
+ * @example
+ *
+ * _.union([1, 2, 3], [5, 2, 1, 4], [2, 1]);
+ * // => [1, 2, 3, 5, 4]
+ */
+function union() {
+  return baseUniq(baseFlatten(arguments, false, true));
+}
+
+module.exports = union;

array/uniq.js

@@ -0,0 +1,71 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseUniq = require('../internal/baseUniq'),
+    isIterateeCall = require('../internal/isIterateeCall'),
+    sortedUniq = require('../internal/sortedUniq');
+
+/**
+ * Creates a duplicate-value-free version of an array using `SameValueZero`
+ * for equality comparisons. Providing `true` for `isSorted` performs a faster
+ * search algorithm for sorted arrays. If an iteratee function is provided it
+ * is invoked for each value in the array to generate the criterion by which
+ * uniqueness is computed. The `iteratee` is bound to `thisArg` and invoked
+ * with three arguments; (value, index, array).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * **Note:** `SameValueZero` comparisons are like strict equality comparisons,
+ * e.g. `===`, except that `NaN` matches `NaN`. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @alias unique
+ * @category Array
+ * @param {Array} array The array to inspect.
+ * @param {boolean} [isSorted] Specify the array is sorted.
+ * @param {Function|Object|string} [iteratee] The function invoked per iteration.
+ *  If a property name or object is provided it is used to create a "_.property"
+ *  or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new duplicate-value-free array.
+ * @example
+ *
+ * _.uniq([1, 2, 1]);
+ * // => [1, 2]
+ *
+ * // using `isSorted`
+ * _.uniq([1, 1, 2], true);
+ * // => [1, 2]
+ *
+ * // using an iteratee function
+ * _.uniq([1, 2.5, 1.5, 2], function(n) { return this.floor(n); }, Math);
+ * // => [1, 2.5]
+ *
+ * // using the "_.property" callback shorthand
+ * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
+ * // => [{ 'x': 1 }, { 'x': 2 }]
+ */
+function uniq(array, isSorted, iteratee, thisArg) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  // Juggle arguments.
+  if (typeof isSorted != 'boolean' && isSorted != null) {
+    thisArg = iteratee;
+    iteratee = isIterateeCall(array, isSorted, thisArg) ? null : isSorted;
+    isSorted = false;
+  }
+  iteratee = iteratee == null ? iteratee : baseCallback(iteratee, thisArg, 3);
+  return (isSorted)
+    ? sortedUniq(array, iteratee)
+    : baseUniq(array, iteratee);
+}
+
+module.exports = uniq;

array/unique.js

@@ -0,0 +1 @@
+module.exports = require('./uniq');

array/unzip.js

@@ -0,0 +1,37 @@
+var arrayMap = require('../internal/arrayMap'),
+    arrayMax = require('../internal/arrayMax'),
+    baseProperty = require('../internal/baseProperty');
+
+/** Used to the length of n-tuples for `_.unzip`. */
+var getLength = baseProperty('length');
+
+/**
+ * This method is like `_.zip` except that it accepts an array of grouped
+ * elements and creates an array regrouping the elements to their pre-`_.zip`
+ * configuration.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array of grouped elements to process.
+ * @returns {Array} Returns the new array of regrouped elements.
+ * @example
+ *
+ * var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]);
+ * // => [['fred', 30, true], ['barney', 40, false]]
+ *
+ * _.unzip(zipped);
+ * // => [['fred', 'barney'], [30, 40], [true, false]]
+ */
+function unzip(array) {
+  var index = -1,
+      length = (array && array.length && arrayMax(arrayMap(array, getLength))) >>> 0,
+      result = Array(length);
+
+  while (++index < length) {
+    result[index] = arrayMap(array, baseProperty(index));
+  }
+  return result;
+}
+
+module.exports = unzip;

array/without.js

@@ -0,0 +1,28 @@
+var baseDifference = require('../internal/baseDifference'),
+    baseSlice = require('../internal/baseSlice');
+
+/**
+ * Creates an array excluding all provided values using `SameValueZero` for
+ * equality comparisons.
+ *
+ * **Note:** `SameValueZero` comparisons are like strict equality comparisons,
+ * e.g. `===`, except that `NaN` matches `NaN`. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to filter.
+ * @param {...*} [values] The values to exclude.
+ * @returns {Array} Returns the new array of filtered values.
+ * @example
+ *
+ * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
+ * // => [2, 3, 4]
+ */
+function without(array) {
+  return baseDifference(array, baseSlice(arguments, 1));
+}
+
+module.exports = without;

array/xor.js

@@ -0,0 +1,39 @@
+var baseDifference = require('../internal/baseDifference'),
+    baseUniq = require('../internal/baseUniq'),
+    isArguments = require('../lang/isArguments'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Creates an array that is the symmetric difference of the provided arrays.
+ * See [Wikipedia](https://en.wikipedia.org/wiki/Symmetric_difference) for
+ * more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to inspect.
+ * @returns {Array} Returns the new array of values.
+ * @example
+ *
+ * _.xor([1, 2, 3], [5, 2, 1, 4]);
+ * // => [3, 5, 4]
+ *
+ * _.xor([1, 2, 5], [2, 3, 5], [3, 4, 5]);
+ * // => [1, 4, 5]
+ */
+function xor() {
+  var index = -1,
+      length = arguments.length;
+
+  while (++index < length) {
+    var array = arguments[index];
+    if (isArray(array) || isArguments(array)) {
+      var result = result
+        ? baseDifference(result, array).concat(baseDifference(array, result))
+        : array;
+    }
+  }
+  return result ? baseUniq(result) : [];
+}
+
+module.exports = xor;

array/zip.js

@@ -0,0 +1,28 @@
+var unzip = require('./unzip');
+
+/**
+ * Creates an array of grouped elements, the first of which contains the first
+ * elements of the given arrays, the second of which contains the second elements
+ * of the given arrays, and so on.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {...Array} [arrays] The arrays to process.
+ * @returns {Array} Returns the new array of grouped elements.
+ * @example
+ *
+ * _.zip(['fred', 'barney'], [30, 40], [true, false]);
+ * // => [['fred', 30, true], ['barney', 40, false]]
+ */
+function zip() {
+  var length = arguments.length,
+      array = Array(length);
+
+  while (length--) {
+    array[length] = arguments[length];
+  }
+  return unzip(array);
+}
+
+module.exports = zip;

array/zipObject.js

@@ -0,0 +1,39 @@
+var isArray = require('../lang/isArray');
+
+/**
+ * Creates an object composed from arrays of property names and values. Provide
+ * either a single two dimensional array, e.g. `[[key1, value1], [key2, value2]]`
+ * or two arrays, one of property names and one of corresponding values.
+ *
+ * @static
+ * @memberOf _
+ * @alias object
+ * @category Array
+ * @param {Array} props The property names.
+ * @param {Array} [values=[]] The property values.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.zipObject(['fred', 'barney'], [30, 40]);
+ * // => { 'fred': 30, 'barney': 40 }
+ */
+function zipObject(props, values) {
+  var index = -1,
+      length = props ? props.length : 0,
+      result = {};
+
+  if (length && !values && !isArray(props[0])) {
+    values = [];
+  }
+  while (++index < length) {
+    var key = props[index];
+    if (values) {
+      result[key] = values[index];
+    } else if (key) {
+      result[key[0]] = key[1];
+    }
+  }
+  return result;
+}
+
+module.exports = zipObject;

chain.js

@@ -0,0 +1,12 @@
+module.exports = {
+  'chain': require('./chain/chain'),
+  'lodash': require('./chain/lodash'),
+  'reverse': require('./chain/reverse'),
+  'tap': require('./chain/tap'),
+  'thru': require('./chain/thru'),
+  'toJSON': require('./chain/toJSON'),
+  'toString': require('./chain/toString'),
+  'value': require('./chain/value'),
+  'valueOf': require('./chain/valueOf'),
+  'wrapperChain': require('./chain/wrapperChain')
+};

chain/chain.js

@@ -0,0 +1,33 @@
+var lodash = require('./lodash');
+
+/**
+ * Creates a `lodash` object that wraps `value` with explicit method
+ * chaining enabled.
+ *
+ * @static
+ * @memberOf _
+ * @category Chain
+ * @param {*} value The value to wrap.
+ * @returns {Object} Returns the new `lodash` object.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney',  'age': 36 },
+ *   { 'user': 'fred',    'age': 40 },
+ *   { 'user': 'pebbles', 'age': 1 }
+ * ];
+ *
+ * var youngest = _.chain(users)
+ *   .sortBy('age')
+ *   .map(function(chr) { return chr.user + ' is ' + chr.age; })
+ *   .first()
+ *   .value();
+ * // => 'pebbles is 1'
+ */
+function chain(value) {
+  var result = lodash(value);
+  result.__chain__ = true;
+  return result;
+}
+
+module.exports = chain;

chain/lodash.js

@@ -0,0 +1,109 @@
+var LodashWrapper = require('../internal/LodashWrapper'),
+    arrayCopy = require('../internal/arrayCopy'),
+    isArray = require('../lang/isArray'),
+    isObjectLike = require('../internal/isObjectLike');
+
+/** Used for native method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Creates a `lodash` object which wraps `value` to enable intuitive chaining.
+ * Methods that operate on and return arrays, collections, and functions can
+ * be chained together. Methods that return a boolean or single value will
+ * automatically end the chain returning the unwrapped value. Explicit chaining
+ * may be enabled using `_.chain`. The execution of chained methods is lazy,
+ * that is, execution is deferred until `_#value` is implicitly or explicitly
+ * called.
+ *
+ * Lazy evaluation allows several methods to support shortcut fusion. Shortcut
+ * fusion is an optimization that merges iteratees to avoid creating intermediate
+ * arrays and reduce the number of iteratee executions.
+ *
+ * Chaining is supported in custom builds as long as the `_#value` method is
+ * directly or indirectly included in the build.
+ *
+ * In addition to lodash methods, wrappers also have the following `Array` methods:
+ * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
+ * and `unshift`
+ *
+ * The wrapper functions that support shortcut fusion are:
+ * `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`, `first`,
+ * `initial`, `last`, `map`, `pluck`, `reject`, `rest`, `reverse`, `slice`,
+ * `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `where`
+ *
+ * The chainable wrapper functions are:
+ * `after`, `ary`, `assign`, `at`, `before`, `bind`, `bindAll`, `bindKey`,
+ * `callback`, `chain`, `chunk`, `compact`, `concat`, `constant`, `countBy`,
+ * `create`, `curry`, `debounce`, `defaults`, `defer`, `delay`, `difference`,
+ * `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`, `flatten`,
+ * `flattenDeep`, `flow`, `flowRight`, `forEach`, `forEachRight`, `forIn`,
+ * `forInRight`, `forOwn`, `forOwnRight`, `functions`, `groupBy`, `indexBy`,
+ * `initial`, `intersection`, `invert`, `invoke`, `keys`, `keysIn`, `map`,
+ * `mapValues`, `matches`, `memoize`, `merge`, `mixin`, `negate`, `noop`,
+ * `omit`, `once`, `pairs`, `partial`, `partialRight`, `partition`, `pick`,
+ * `pluck`, `property`, `propertyOf`, `pull`, `pullAt`, `push`, `range`,
+ * `rearg`, `reject`, `remove`, `rest`, `reverse`, `shuffle`, `slice`, `sort`,
+ * `sortBy`, `sortByAll`, `splice`, `take`, `takeRight`, `takeRightWhile`,
+ * `takeWhile`, `tap`, `throttle`, `thru`, `times`, `toArray`, `toPlainObject`,
+ * `transform`, `union`, `uniq`, `unshift`, `unzip`, `values`, `valuesIn`,
+ * `where`, `without`, `wrap`, `xor`, `zip`, and `zipObject`
+ *
+ * The wrapper functions that are **not** chainable by default are:
+ * `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `deburr`,
+ * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`,
+ * `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, `has`,
+ * `identity`, `includes`, `indexOf`, `isArguments`, `isArray`, `isBoolean`,
+ * `isDate`, `isElement`, `isEmpty`, `isEqual`, `isError`, `isFinite`,
+ * `isFunction`, `isMatch` , `isNative`, `isNaN`, `isNull`, `isNumber`,
+ * `isObject`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`,
+ * `isTypedArray`, `join`, `kebabCase`, `last`, `lastIndexOf`, `max`, `min`,
+ * `noConflict`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`,
+ * `random`, `reduce`, `reduceRight`, `repeat`, `result`, `runInContext`,
+ * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`,
+ * `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`,
+ * `unescape`, `uniqueId`, `value`, and `words`
+ *
+ * The wrapper function `sample` will return a wrapped value when `n` is provided,
+ * otherwise an unwrapped value is returned.
+ *
+ * @name _
+ * @constructor
+ * @category Chain
+ * @param {*} value The value to wrap in a `lodash` instance.
+ * @returns {Object} Returns a `lodash` instance.
+ * @example
+ *
+ * var wrapped = _([1, 2, 3]);
+ *
+ * // returns an unwrapped value
+ * wrapped.reduce(function(sum, n) { return sum + n; });
+ * // => 6
+ *
+ * // returns a wrapped value
+ * var squares = wrapped.map(function(n) { return n * n; });
+ *
+ * _.isArray(squares);
+ * // => false
+ *
+ * _.isArray(squares.value());
+ * // => true
+ */
+function lodash(value) {
+  if (isObjectLike(value) && !isArray(value)) {
+    if (value instanceof LodashWrapper) {
+      return value;
+    }
+    if (hasOwnProperty.call(value, '__wrapped__')) {
+      return new LodashWrapper(value.__wrapped__, value.__chain__, arrayCopy(value.__actions__));
+    }
+  }
+  return new LodashWrapper(value);
+}
+
+// Ensure `new LodashWrapper` is an instance of `lodash`.
+LodashWrapper.prototype = lodash.prototype;
+
+module.exports = lodash;

chain/reverse.js

@@ -0,0 +1 @@
+module.exports = require('./wrapperReverse');

chain/tap.js

@@ -0,0 +1,27 @@
+/**
+ * This method invokes `interceptor` and returns `value`. The interceptor is
+ * bound to `thisArg` and invoked with one argument; (value). The purpose of
+ * this method is to "tap into" a method chain in order to perform operations
+ * on intermediate results within the chain.
+ *
+ * @static
+ * @memberOf _
+ * @category Chain
+ * @param {*} value The value to provide to `interceptor`.
+ * @param {Function} interceptor The function to invoke.
+ * @param {*} [thisArg] The `this` binding of `interceptor`.
+ * @returns {*} Returns `value`.
+ * @example
+ *
+ * _([1, 2, 3])
+ *  .tap(function(array) { array.pop(); })
+ *  .reverse()
+ *  .value();
+ * // => [2, 1]
+ */
+function tap(value, interceptor, thisArg) {
+  interceptor.call(thisArg, value);
+  return value;
+}
+
+module.exports = tap;

chain/thru.js

@@ -0,0 +1,23 @@
+/**
+ * This method is like `_.tap` except that it returns the result of `interceptor`.
+ *
+ * @static
+ * @memberOf _
+ * @category Chain
+ * @param {*} value The value to provide to `interceptor`.
+ * @param {Function} interceptor The function to invoke.
+ * @param {*} [thisArg] The `this` binding of `interceptor`.
+ * @returns {*} Returns the result of `interceptor`.
+ * @example
+ *
+ * _([1, 2, 3])
+ *  .last()
+ *  .thru(function(value) { return [value]; })
+ *  .value();
+ * // => [3]
+ */
+function thru(value, interceptor, thisArg) {
+  return interceptor.call(thisArg, value);
+}
+
+module.exports = thru;

chain/toJSON.js

@@ -0,0 +1 @@
+module.exports = require('./wrapperValue');

chain/toString.js

@@ -0,0 +1 @@
+module.exports = require('./wrapperToString');

chain/value.js

@@ -0,0 +1 @@
+module.exports = require('./wrapperValue');

chain/valueOf.js

@@ -0,0 +1 @@
+module.exports = require('./wrapperValue');

chain/wrapperChain.js

@@ -0,0 +1,32 @@
+var chain = require('./chain');
+
+/**
+ * Enables explicit method chaining on the wrapper object.
+ *
+ * @name chain
+ * @memberOf _
+ * @category Chain
+ * @returns {*} Returns the `lodash` object.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36 },
+ *   { 'user': 'fred',   'age': 40 }
+ * ];
+ *
+ * // without explicit chaining
+ * _(users).first();
+ * // => { 'user': 'barney', 'age': 36 }
+ *
+ * // with explicit chaining
+ * _(users).chain()
+ *   .first()
+ *   .pick('user')
+ *   .value();
+ * // => { 'user': 'barney' }
+ */
+function wrapperChain() {
+  return chain(this);
+}
+
+module.exports = wrapperChain;

chain/wrapperReverse.js

@@ -0,0 +1,35 @@
+var LazyWrapper = require('../internal/LazyWrapper'),
+    LodashWrapper = require('../internal/LodashWrapper'),
+    thru = require('./thru');
+
+/**
+ * Reverses the wrapped array so the first element becomes the last, the
+ * second element becomes the second to last, and so on.
+ *
+ * **Note:** This method mutates the wrapped array.
+ *
+ * @name reverse
+ * @memberOf _
+ * @category Chain
+ * @returns {Object} Returns the new reversed `lodash` object.
+ * @example
+ *
+ * var array = [1, 2, 3];
+ *
+ * _(array).reverse().value()
+ * // => [3, 2, 1]
+ *
+ * console.log(array);
+ * // => [3, 2, 1]
+ */
+function wrapperReverse() {
+  var value = this.__wrapped__;
+  if (value instanceof LazyWrapper) {
+    return new LodashWrapper(value.reverse());
+  }
+  return this.thru(function(value) {
+    return value.reverse();
+  });
+}
+
+module.exports = wrapperReverse;

chain/wrapperToString.js

@@ -0,0 +1,17 @@
+/**
+ * Produces the result of coercing the unwrapped value to a string.
+ *
+ * @name toString
+ * @memberOf _
+ * @category Chain
+ * @returns {string} Returns the coerced string value.
+ * @example
+ *
+ * _([1, 2, 3]).toString();
+ * // => '1,2,3'
+ */
+function wrapperToString() {
+  return (this.value() + '');
+}
+
+module.exports = wrapperToString;

chain/wrapperValue.js

@@ -0,0 +1,20 @@
+var baseWrapperValue = require('../internal/baseWrapperValue');
+
+/**
+ * Executes the chained sequence to extract the unwrapped value.
+ *
+ * @name value
+ * @memberOf _
+ * @alias toJSON, valueOf
+ * @category Chain
+ * @returns {*} Returns the resolved unwrapped value.
+ * @example
+ *
+ * _([1, 2, 3]).value();
+ * // => [1, 2, 3]
+ */
+function wrapperValue() {
+  return baseWrapperValue(this.__wrapped__, this.__actions__);
+}
+
+module.exports = wrapperValue;

collection.js

@@ -0,0 +1,42 @@
+module.exports = {
+  'all': require('./collection/all'),
+  'any': require('./collection/any'),
+  'at': require('./collection/at'),
+  'collect': require('./collection/collect'),
+  'contains': require('./collection/contains'),
+  'countBy': require('./collection/countBy'),
+  'detect': require('./collection/detect'),
+  'each': require('./collection/each'),
+  'eachRight': require('./collection/eachRight'),
+  'every': require('./collection/every'),
+  'filter': require('./collection/filter'),
+  'find': require('./collection/find'),
+  'findLast': require('./collection/findLast'),
+  'findWhere': require('./collection/findWhere'),
+  'foldl': require('./collection/foldl'),
+  'foldr': require('./collection/foldr'),
+  'forEach': require('./collection/forEach'),
+  'forEachRight': require('./collection/forEachRight'),
+  'groupBy': require('./collection/groupBy'),
+  'include': require('./collection/include'),
+  'includes': require('./collection/includes'),
+  'indexBy': require('./collection/indexBy'),
+  'inject': require('./collection/inject'),
+  'invoke': require('./collection/invoke'),
+  'map': require('./collection/map'),
+  'max': require('./collection/max'),
+  'min': require('./collection/min'),
+  'partition': require('./collection/partition'),
+  'pluck': require('./collection/pluck'),
+  'reduce': require('./collection/reduce'),
+  'reduceRight': require('./collection/reduceRight'),
+  'reject': require('./collection/reject'),
+  'sample': require('./collection/sample'),
+  'select': require('./collection/select'),
+  'shuffle': require('./collection/shuffle'),
+  'size': require('./collection/size'),
+  'some': require('./collection/some'),
+  'sortBy': require('./collection/sortBy'),
+  'sortByAll': require('./collection/sortByAll'),
+  'where': require('./collection/where')
+};

collection/all.js

@@ -0,0 +1 @@
+module.exports = require('./every');

collection/any.js

@@ -0,0 +1 @@
+module.exports = require('./some');

collection/at.js

@@ -0,0 +1,34 @@
+var baseAt = require('../internal/baseAt'),
+    baseFlatten = require('../internal/baseFlatten'),
+    isLength = require('../internal/isLength'),
+    toIterable = require('../internal/toIterable');
+
+/**
+ * Creates an array of elements corresponding to the given keys, or indexes,
+ * of `collection`. Keys may be specified as individual arguments or as arrays
+ * of keys.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {...(number|number[]|string|string[])} [props] The property names
+ *  or indexes of elements to pick, specified individually or in arrays.
+ * @returns {Array} Returns the new array of picked elements.
+ * @example
+ *
+ * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]);
+ * // => ['a', 'c', 'e']
+ *
+ * _.at(['fred', 'barney', 'pebbles'], 0, 2);
+ * // => ['fred', 'pebbles']
+ */
+function at(collection) {
+  var length = collection ? collection.length : 0;
+  if (isLength(length)) {
+    collection = toIterable(collection);
+  }
+  return baseAt(collection, baseFlatten(arguments, false, false, 1));
+}
+
+module.exports = at;

collection/collect.js

@@ -0,0 +1 @@
+module.exports = require('./map');

collection/contains.js

@@ -0,0 +1 @@
+module.exports = require('./includes');

collection/countBy.js

@@ -0,0 +1,47 @@
+var createAggregator = require('../internal/createAggregator');
+
+/** Used for native method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` through `iteratee`. The corresponding value
+ * of each key is the number of times the key was returned by `iteratee`.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments;
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(n) { return Math.floor(n); });
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy([4.3, 6.1, 6.4], function(n) { return this.floor(n); }, Math);
+ * // => { '4': 1, '6': 2 }
+ *
+ * _.countBy(['one', 'two', 'three'], 'length');
+ * // => { '3': 2, '5': 1 }
+ */
+var countBy = createAggregator(function(result, value, key) {
+  hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1);
+});
+
+module.exports = countBy;

collection/detect.js

@@ -0,0 +1 @@
+module.exports = require('./find');

collection/each.js

@@ -0,0 +1 @@
+module.exports = require('./forEach');

collection/eachRight.js

@@ -0,0 +1 @@
+module.exports = require('./forEachRight');

collection/every.js

@@ -0,0 +1,55 @@
+var arrayEvery = require('../internal/arrayEvery'),
+    baseCallback = require('../internal/baseCallback'),
+    baseEvery = require('../internal/baseEvery'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Checks if `predicate` returns truthy for **all** elements of `collection`.
+ * The predicate is bound to `thisArg` and invoked with three arguments;
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias all
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check,
+ *  else `false`.
+ * @example
+ *
+ * _.every([true, 1, null, 'yes']);
+ * // => false
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36 },
+ *   { 'user': 'fred',   'age': 40 }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.every(users, 'age');
+ * // => true
+ *
+ * // using the "_.matches" callback shorthand
+ * _.every(users, { 'age': 36 });
+ * // => false
+ */
+function every(collection, predicate, thisArg) {
+  var func = isArray(collection) ? arrayEvery : baseEvery;
+  if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
+    predicate = baseCallback(predicate, thisArg, 3);
+  }
+  return func(collection, predicate);
+}
+
+module.exports = every;

collection/filter.js

@@ -0,0 +1,52 @@
+var arrayFilter = require('../internal/arrayFilter'),
+    baseCallback = require('../internal/baseCallback'),
+    baseFilter = require('../internal/baseFilter'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Iterates over elements of `collection`, returning an array of all elements
+ * `predicate` returns truthy for. The predicate is bound to `thisArg` and
+ * invoked with three arguments; (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias select
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * var evens = _.filter([1, 2, 3, 4], function(n) { return n % 2 == 0; });
+ * // => [2, 4]
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36, 'active': false },
+ *   { 'user': 'fred',   'age': 40, 'active': true }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.pluck(_.filter(users, 'active'), 'user');
+ * // => ['fred']
+ *
+ * // using the "_.matches" callback shorthand
+ * _.pluck(_.filter(users, { 'age': 36 }), 'user');
+ * // => ['barney']
+ */
+function filter(collection, predicate, thisArg) {
+  var func = isArray(collection) ? arrayFilter : baseFilter;
+  predicate = baseCallback(predicate, thisArg, 3);
+  return func(collection, predicate);
+}
+
+module.exports = filter;

collection/find.js

@@ -0,0 +1,57 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseEach = require('../internal/baseEach'),
+    baseFind = require('../internal/baseFind'),
+    findIndex = require('../array/findIndex'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Iterates over elements of `collection`, returning the first element
+ * `predicate` returns truthy for. The predicate is bound to `thisArg` and
+ * invoked with three arguments; (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias detect
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney',  'age': 36, 'active': false },
+ *   { 'user': 'fred',    'age': 40, 'active': true },
+ *   { 'user': 'pebbles', 'age': 1,  'active': false }
+ * ];
+ *
+ * _.result(_.find(users, function(chr) { return chr.age < 40; }), 'user');
+ * // => 'barney'
+ *
+ * // using the "_.matches" callback shorthand
+ * _.result(_.find(users, { 'age': 1 }), 'user');
+ * // => 'pebbles'
+ *
+ * // using the "_.property" callback shorthand
+ * _.result(_.find(users, 'active'), 'user');
+ * // => 'fred'
+ */
+function find(collection, predicate, thisArg) {
+  if (isArray(collection)) {
+    var index = findIndex(collection, predicate, thisArg);
+    return index > -1 ? collection[index] : undefined;
+  }
+  predicate = baseCallback(predicate, thisArg, 3);
+  return baseFind(collection, predicate, baseEach);
+}
+
+module.exports = find;

collection/findLast.js

@@ -0,0 +1,28 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseEachRight = require('../internal/baseEachRight'),
+    baseFind = require('../internal/baseFind');
+
+/**
+ * This method is like `_.find` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * _.findLast([1, 2, 3, 4], function(n) { return n % 2 == 1; });
+ * // => 3
+ */
+function findLast(collection, predicate, thisArg) {
+  predicate = baseCallback(predicate, thisArg, 3);
+  return baseFind(collection, predicate, baseEachRight);
+}
+
+module.exports = findLast;

collection/findWhere.js

@@ -0,0 +1,32 @@
+var find = require('./find'),
+    matches = require('../utility/matches');
+
+/**
+ * Performs a deep comparison between each element in `collection` and the
+ * source object, returning the first element that has equivalent property
+ * values.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Object} source The object of property values to match.
+ * @returns {*} Returns the matched element, else `undefined`.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36, 'status': 'busy' },
+ *   { 'user': 'fred',   'age': 40, 'status': 'busy' }
+ * ];
+ *
+ * _.result(_.findWhere(users, { 'status': 'busy' }), 'user');
+ * // => 'barney'
+ *
+ * _.result(_.findWhere(users, { 'age': 40 }), 'user');
+ * // => 'fred'
+ */
+function findWhere(collection, source) {
+  return find(collection, matches(source));
+}
+
+module.exports = findWhere;

collection/foldl.js

@@ -0,0 +1 @@
+module.exports = require('./reduce');

collection/foldr.js

@@ -0,0 +1 @@
+module.exports = require('./reduceRight');

collection/forEach.js

@@ -0,0 +1,38 @@
+var arrayEach = require('../internal/arrayEach'),
+    baseEach = require('../internal/baseEach'),
+    bindCallback = require('../internal/bindCallback'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Iterates over elements of `collection` invoking `iteratee` for each element.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments;
+ * (value, index|key, collection). Iterator functions may exit iteration early
+ * by explicitly returning `false`.
+ *
+ * **Note:** As with other "Collections" methods, objects with a `length` property
+ * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn`
+ * may be used for object iteration.
+ *
+ * @static
+ * @memberOf _
+ * @alias each
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array|Object|string} Returns `collection`.
+ * @example
+ *
+ * _([1, 2, 3]).forEach(function(n) { console.log(n); });
+ * // => logs each value from left to right and returns the array
+ *
+ * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(n, key) { console.log(n, key); });
+ * // => logs each value-key pair and returns the object (iteration order is not guaranteed)
+ */
+function forEach(collection, iteratee, thisArg) {
+  return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection))
+    ? arrayEach(collection, iteratee)
+    : baseEach(collection, bindCallback(iteratee, thisArg, 3));
+}
+
+module.exports = forEach;

collection/forEachRight.js

@@ -0,0 +1,29 @@
+var arrayEachRight = require('../internal/arrayEachRight'),
+    baseEachRight = require('../internal/baseEachRight'),
+    bindCallback = require('../internal/bindCallback'),
+    isArray = require('../lang/isArray');
+
+/**
+ * This method is like `_.forEach` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @alias eachRight
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array|Object|string} Returns `collection`.
+ * @example
+ *
+ * _([1, 2, 3]).forEachRight(function(n) { console.log(n); }).join(',');
+ * // => logs each value from right to left and returns the array
+ */
+function forEachRight(collection, iteratee, thisArg) {
+  return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection))
+    ? arrayEachRight(collection, iteratee)
+    : baseEachRight(collection, bindCallback(iteratee, thisArg, 3));
+}
+
+module.exports = forEachRight;

collection/groupBy.js

@@ -0,0 +1,52 @@
+var createAggregator = require('../internal/createAggregator');
+
+/** Used for native method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` through `iteratee`. The corresponding value
+ * of each key is an array of the elements responsible for generating the key.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments;
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * _.groupBy([4.2, 6.1, 6.4], function(n) { return Math.floor(n); });
+ * // => { '4': [4.2], '6': [6.1, 6.4] }
+ *
+ * _.groupBy([4.2, 6.1, 6.4], function(n) { return this.floor(n); }, Math);
+ * // => { '4': [4.2], '6': [6.1, 6.4] }
+ *
+ * // using the "_.property" callback shorthand
+ * _.groupBy(['one', 'two', 'three'], 'length');
+ * // => { '3': ['one', 'two'], '5': ['three'] }
+ */
+var groupBy = createAggregator(function(result, value, key) {
+  if (hasOwnProperty.call(result, key)) {
+    result[key].push(value);
+  } else {
+    result[key] = [value];
+  }
+});
+
+module.exports = groupBy;

collection/include.js

@@ -0,0 +1 @@
+module.exports = require('./includes');

collection/includes.js

@@ -0,0 +1,61 @@
+var baseIndexOf = require('../internal/baseIndexOf'),
+    isArray = require('../lang/isArray'),
+    isLength = require('../internal/isLength'),
+    isString = require('../lang/isString'),
+    values = require('../object/values');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * Checks if `value` is in `collection` using `SameValueZero` for equality
+ * comparisons. If `fromIndex` is negative, it is used as the offset from
+ * the end of `collection`.
+ *
+ * **Note:** `SameValueZero` comparisons are like strict equality comparisons,
+ * e.g. `===`, except that `NaN` matches `NaN`. See the
+ * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @alias contains, include
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {*} target The value to search for.
+ * @param {number} [fromIndex=0] The index to search from.
+ * @returns {boolean} Returns `true` if a matching element is found, else `false`.
+ * @example
+ *
+ * _.includes([1, 2, 3], 1);
+ * // => true
+ *
+ * _.includes([1, 2, 3], 1, 2);
+ * // => false
+ *
+ * _.includes({ 'user': 'fred', 'age': 40 }, 'fred');
+ * // => true
+ *
+ * _.includes('pebbles', 'eb');
+ * // => true
+ */
+function includes(collection, target, fromIndex) {
+  var length = collection ? collection.length : 0;
+  if (!isLength(length)) {
+    collection = values(collection);
+    length = collection.length;
+  }
+  if (!length) {
+    return false;
+  }
+  if (typeof fromIndex == 'number') {
+    fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0);
+  } else {
+    fromIndex = 0;
+  }
+  return (typeof collection == 'string' || !isArray(collection) && isString(collection))
+    ? (fromIndex < length && collection.indexOf(target, fromIndex) > -1)
+    : (baseIndexOf(collection, target, fromIndex) > -1);
+}
+
+module.exports = includes;

collection/indexBy.js

@@ -0,0 +1,46 @@
+var createAggregator = require('../internal/createAggregator');
+
+/**
+ * Creates an object composed of keys generated from the results of running
+ * each element of `collection` through `iteratee`. The corresponding value
+ * of each key is the last element responsible for generating the key. The
+ * iteratee function is bound to `thisArg` and invoked with three arguments;
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Object} Returns the composed aggregate object.
+ * @example
+ *
+ * var keyData = [
+ *   { 'dir': 'left', 'code': 97 },
+ *   { 'dir': 'right', 'code': 100 }
+ * ];
+ *
+ * _.indexBy(keyData, 'dir');
+ * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
+ *
+ * _.indexBy(keyData, function(object) { return String.fromCharCode(object.code); });
+ * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+ *
+ * _.indexBy(keyData, function(object) { return this.fromCharCode(object.code); }, String);
+ * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
+ */
+var indexBy = createAggregator(function(result, value, key) {
+  result[key] = value;
+});
+
+module.exports = indexBy;

collection/inject.js

@@ -0,0 +1 @@
+module.exports = require('./reduce');

collection/invoke.js

@@ -0,0 +1,30 @@
+var baseInvoke = require('../internal/baseInvoke'),
+    baseSlice = require('../internal/baseSlice');
+
+/**
+ * Invokes the method named by `methodName` on each element in `collection`,
+ * returning an array of the results of each invoked method. Any additional
+ * arguments are provided to each invoked method. If `methodName` is a function
+ * it is invoked for, and `this` bound to, each element in `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @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 {...*} [args] The arguments to invoke the method with.
+ * @returns {Array} Returns the array of results.
+ * @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) {
+  return baseInvoke(collection, methodName, baseSlice(arguments, 2));
+}
+
+module.exports = invoke;

collection/map.js

@@ -0,0 +1,51 @@
+var arrayMap = require('../internal/arrayMap'),
+    baseCallback = require('../internal/baseCallback'),
+    baseMap = require('../internal/baseMap'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Creates an array of values by running each element in `collection` through
+ * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
+ * arguments; (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias collect
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new mapped array.
+ * @example
+ *
+ * _.map([1, 2, 3], function(n) { return n * 3; });
+ * // => [3, 6, 9]
+ *
+ * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(n) { return n * 3; });
+ * // => [3, 6, 9] (iteration order is not guaranteed)
+ *
+ * var users = [
+ *   { 'user': 'barney' },
+ *   { 'user': 'fred' }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.map(users, 'user');
+ * // => ['barney', 'fred']
+ */
+function map(collection, iteratee, thisArg) {
+  var func = isArray(collection) ? arrayMap : baseMap;
+  iteratee = baseCallback(iteratee, thisArg, 3);
+  return func(collection, iteratee);
+}
+
+module.exports = map;

collection/max.js

@@ -0,0 +1,49 @@
+var arrayMax = require('../internal/arrayMax'),
+    createExtremum = require('../internal/createExtremum');
+
+/**
+ * Gets the maximum value of `collection`. If `collection` is empty or falsey
+ * `-Infinity` is returned. If an iteratee function is provided it is invoked
+ * for each value in `collection` to generate the criterion by which the value
+ * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
+ * arguments; (value, index, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee] The function invoked per iteration.
+ *  If a property name or object is provided it is used to create a "_.property"
+ *  or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the maximum value.
+ * @example
+ *
+ * _.max([4, 2, 8, 6]);
+ * // => 8
+ *
+ * _.max([]);
+ * // => -Infinity
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36 },
+ *   { 'user': 'fred',   'age': 40 }
+ * ];
+ *
+ * _.max(users, function(chr) { return chr.age; });
+ * // => { 'user': 'fred', 'age': 40 };
+ *
+ * // using the "_.property" callback shorthand
+ * _.max(users, 'age');
+ * // => { 'user': 'fred', 'age': 40 };
+ */
+var max = createExtremum(arrayMax);
+
+module.exports = max;

collection/min.js

@@ -0,0 +1,49 @@
+var arrayMin = require('../internal/arrayMin'),
+    createExtremum = require('../internal/createExtremum');
+
+/**
+ * Gets the minimum value of `collection`. If `collection` is empty or falsey
+ * `Infinity` is returned. If an iteratee function is provided it is invoked
+ * for each value in `collection` to generate the criterion by which the value
+ * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
+ * arguments; (value, index, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [iteratee] The function invoked per iteration.
+ *  If a property name or object is provided it is used to create a "_.property"
+ *  or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the minimum value.
+ * @example
+ *
+ * _.min([4, 2, 8, 6]);
+ * // => 2
+ *
+ * _.min([]);
+ * // => Infinity
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36 },
+ *   { 'user': 'fred',   'age': 40 }
+ * ];
+ *
+ * _.min(users, function(chr) { return chr.age; });
+ * // => { 'user': 'barney', 'age': 36 };
+ *
+ * // using the "_.property" callback shorthand
+ * _.min(users, 'age');
+ * // => { 'user': 'barney', 'age': 36 };
+ */
+var min = createExtremum(arrayMin, true);
+
+module.exports = min;

collection/partition.js

@@ -0,0 +1,51 @@
+var createAggregator = require('../internal/createAggregator');
+
+/**
+ * Creates an array of elements split into two groups, the first of which
+ * contains elements `predicate` returns truthy for, while the second of which
+ * contains elements `predicate` returns falsey for. The predicate is bound
+ * to `thisArg` and invoked with three arguments; (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the array of grouped elements.
+ * @example
+ *
+ * _.partition([1, 2, 3], function(n) { return n % 2; });
+ * // => [[1, 3], [2]]
+ *
+ * _.partition([1.2, 2.3, 3.4], function(n) { return this.floor(n) % 2; }, Math);
+ * // => [[1, 3], [2]]
+ *
+ * var users = [
+ *   { 'user': 'barney',  'age': 36, 'active': false },
+ *   { 'user': 'fred',    'age': 40, 'active': true },
+ *   { 'user': 'pebbles', 'age': 1,  'active': false }
+ * ];
+ *
+ * // using the "_.matches" callback shorthand
+ * _.map(_.partition(users, { 'age': 1 }), function(array) { return _.pluck(array, 'user'); });
+ * // => [['pebbles'], ['barney', 'fred']]
+ *
+ * // using the "_.property" callback shorthand
+ * _.map(_.partition(users, 'active'), function(array) { return _.pluck(array, 'user'); });
+ * // => [['fred'], ['barney', 'pebbles']]
+ */
+var partition = createAggregator(function(result, value, key) {
+  result[key ? 0 : 1].push(value);
+}, function() { return [[], []]; });
+
+module.exports = partition;

collection/pluck.js

@@ -0,0 +1,31 @@
+var map = require('./map'),
+    property = require('../utility/property');
+
+/**
+ * Gets the value of `key` from all elements in `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {string} key The key of the property to pluck.
+ * @returns {Array} Returns the property values.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36 },
+ *   { 'user': 'fred',   'age': 40 }
+ * ];
+ *
+ * _.pluck(users, 'user');
+ * // => ['barney', 'fred']
+ *
+ * var userIndex = _.indexBy(users, 'user');
+ * _.pluck(userIndex, 'age');
+ * // => [36, 40] (iteration order is not guaranteed)
+ */
+function pluck(collection, key) {
+  return map(collection, property(key));
+}
+
+module.exports = pluck;

collection/reduce.js

@@ -0,0 +1,40 @@
+var arrayReduce = require('../internal/arrayReduce'),
+    baseCallback = require('../internal/baseCallback'),
+    baseEach = require('../internal/baseEach'),
+    baseReduce = require('../internal/baseReduce'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Reduces `collection` to a value which is the accumulated result of running
+ * each element in `collection` through `iteratee`, where each successive
+ * invocation is supplied the return value of the previous. If `accumulator`
+ * is not provided the first element of `collection` is used as the initial
+ * value. The `iteratee` is bound to `thisArg`and invoked with four arguments;
+ * (accumulator, value, index|key, collection).
+ *
+ * @static
+ * @memberOf _
+ * @alias foldl, inject
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the accumulated value.
+ * @example
+ *
+ * var sum = _.reduce([1, 2, 3], function(sum, n) { return sum + n; });
+ * // => 6
+ *
+ * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, n, key) {
+ *   result[key] = n * 3;
+ *   return result;
+ * }, {});
+ * // => { 'a': 3, 'b': 6, 'c': 9 } (iteration order is not guaranteed)
+ */
+function reduce(collection, iteratee, accumulator, thisArg) {
+  var func = isArray(collection) ? arrayReduce : baseReduce;
+  return func(collection, baseCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEach);
+}
+
+module.exports = reduce;

collection/reduceRight.js

@@ -0,0 +1,31 @@
+var arrayReduceRight = require('../internal/arrayReduceRight'),
+    baseCallback = require('../internal/baseCallback'),
+    baseEachRight = require('../internal/baseEachRight'),
+    baseReduce = require('../internal/baseReduce'),
+    isArray = require('../lang/isArray');
+
+/**
+ * This method is like `_.reduce` except that it iterates over elements of
+ * `collection` from right to left.
+ *
+ * @static
+ * @memberOf _
+ * @alias foldr
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function} [iteratee=_.identity] The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {*} Returns the accumulated value.
+ * @example
+ *
+ * var array = [[0, 1], [2, 3], [4, 5]];
+ * _.reduceRight(array, function(flattened, other) { return flattened.concat(other); }, []);
+ * // => [4, 5, 2, 3, 0, 1]
+ */
+function reduceRight(collection, iteratee, accumulator, thisArg) {
+  var func = isArray(collection) ? arrayReduceRight : baseReduce;
+  return func(collection, baseCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
+}
+
+module.exports = reduceRight;

collection/reject.js

@@ -0,0 +1,52 @@
+var arrayFilter = require('../internal/arrayFilter'),
+    baseCallback = require('../internal/baseCallback'),
+    baseFilter = require('../internal/baseFilter'),
+    isArray = require('../lang/isArray');
+
+/**
+ * The opposite of `_.filter`; this method returns the elements of `collection`
+ * that `predicate` does **not** return truthy for.
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * var odds = _.reject([1, 2, 3, 4], function(n) { return n % 2 == 0; });
+ * // => [1, 3]
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36, 'active': false },
+ *   { 'user': 'fred',   'age': 40, 'active': true }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.pluck(_.reject(users, 'active'), 'user');
+ * // => ['barney']
+ *
+ * // using the "_.matches" callback shorthand
+ * _.pluck(_.reject(users, { 'age': 36 }), 'user');
+ * // => ['fred']
+ */
+function reject(collection, predicate, thisArg) {
+  var func = isArray(collection) ? arrayFilter : baseFilter;
+  predicate = baseCallback(predicate, thisArg, 3);
+  return func(collection, function(value, index, collection) {
+    return !predicate(value, index, collection);
+  });
+}
+
+module.exports = reject;

collection/sample.js

@@ -0,0 +1,38 @@
+var baseRandom = require('../internal/baseRandom'),
+    isIterateeCall = require('../internal/isIterateeCall'),
+    shuffle = require('./shuffle'),
+    toIterable = require('../internal/toIterable');
+
+/* Native method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min;
+
+/**
+ * Gets a random element or `n` random elements from a collection.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to sample.
+ * @param {number} [n] The number of elements to sample.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
+ * @returns {*} Returns the random sample(s).
+ * @example
+ *
+ * _.sample([1, 2, 3, 4]);
+ * // => 2
+ *
+ * _.sample([1, 2, 3, 4], 2);
+ * // => [3, 1]
+ */
+function sample(collection, n, guard) {
+  if (guard ? isIterateeCall(collection, n, guard) : n == null) {
+    collection = toIterable(collection);
+    var length = collection.length;
+    return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
+  }
+  var result = shuffle(collection);
+  result.length = nativeMin(n < 0 ? 0 : (+n || 0), result.length);
+  return result;
+}
+
+module.exports = sample;

collection/select.js

@@ -0,0 +1 @@
+module.exports = require('./filter');

collection/shuffle.js

@@ -0,0 +1,36 @@
+var baseRandom = require('../internal/baseRandom'),
+    toIterable = require('../internal/toIterable');
+
+/**
+ * Creates an array of shuffled values, using a version of the Fisher-Yates
+ * shuffle. See [Wikipedia](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle)
+ * for more details.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ * @example
+ *
+ * _.shuffle([1, 2, 3, 4]);
+ * // => [4, 1, 3, 2]
+ */
+function shuffle(collection) {
+  collection = toIterable(collection);
+
+  var index = -1,
+      length = collection.length,
+      result = Array(length);
+
+  while (++index < length) {
+    var rand = baseRandom(0, index);
+    if (index != rand) {
+      result[index] = result[rand];
+    }
+    result[rand] = collection[index];
+  }
+  return result;
+}
+
+module.exports = shuffle;

collection/size.js

@@ -0,0 +1,29 @@
+var isLength = require('../internal/isLength'),
+    keys = require('../object/keys');
+
+/**
+ * Gets the size of `collection` by returning `collection.length` for
+ * array-like values or the number of own enumerable properties for objects.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to inspect.
+ * @returns {number} Returns the size of `collection`.
+ * @example
+ *
+ * _.size([1, 2]);
+ * // => 2
+ *
+ * _.size({ 'one': 1, 'two': 2, 'three': 3 });
+ * // => 3
+ *
+ * _.size('pebbles');
+ * // => 7
+ */
+function size(collection) {
+  var length = collection ? collection.length : 0;
+  return isLength(length) ? length : keys(collection).length;
+}
+
+module.exports = size;

collection/some.js

@@ -0,0 +1,56 @@
+var arraySome = require('../internal/arraySome'),
+    baseCallback = require('../internal/baseCallback'),
+    baseSome = require('../internal/baseSome'),
+    isArray = require('../lang/isArray');
+
+/**
+ * Checks if `predicate` returns truthy for **any** element of `collection`.
+ * The function returns as soon as it finds a passing value and does not iterate
+ * over the entire collection. The predicate is bound to `thisArg` and invoked
+ * with three arguments; (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @alias any
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Function|Object|string} [predicate=_.identity] The function invoked
+ *  per iteration. If a property name or object is provided it is used to
+ *  create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `predicate`.
+ * @returns {boolean} Returns `true` if any element passes the predicate check,
+ *  else `false`.
+ * @example
+ *
+ * _.some([null, 0, 'yes', false], Boolean);
+ * // => true
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36, 'active': false },
+ *   { 'user': 'fred',   'age': 40, 'active': true }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.some(users, 'active');
+ * // => true
+ *
+ * // using the "_.matches" callback shorthand
+ * _.some(users, { 'age': 1 });
+ * // => false
+ */
+function some(collection, predicate, thisArg) {
+  var func = isArray(collection) ? arraySome : baseSome;
+  if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
+    predicate = baseCallback(predicate, thisArg, 3);
+  }
+  return func(collection, predicate);
+}
+
+module.exports = some;

collection/sortBy.js

@@ -0,0 +1,64 @@
+var baseCallback = require('../internal/baseCallback'),
+    baseEach = require('../internal/baseEach'),
+    baseSortBy = require('../internal/baseSortBy'),
+    compareAscending = require('../internal/compareAscending'),
+    isIterateeCall = require('../internal/isIterateeCall'),
+    isLength = require('../internal/isLength');
+
+/**
+ * Creates an array of elements, sorted in ascending order by the results of
+ * running each element in a collection through `iteratee`. This method performs
+ * a stable sort, that is, it preserves the original sort order of equal elements.
+ * The `iteratee` is bound to `thisArg` and invoked with three arguments;
+ * (value, index|key, collection).
+ *
+ * If a property name is provided for `predicate` the created "_.property"
+ * style callback returns the property value of the given element.
+ *
+ * If an object is provided for `predicate` the created "_.matches" style
+ * callback returns `true` for elements that have the properties of the given
+ * object, else `false`.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Array|Function|Object|string} [iteratee=_.identity] The function
+ *  invoked per iteration. If a property name or an object is provided it is
+ *  used to create a "_.property" or "_.matches" style callback respectively.
+ * @param {*} [thisArg] The `this` binding of `iteratee`.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * _.sortBy([1, 2, 3], function(n) { return Math.sin(n); });
+ * // => [3, 1, 2]
+ *
+ * _.sortBy([1, 2, 3], function(n) { return this.sin(n); }, Math);
+ * // => [3, 1, 2]
+ *
+ * var users = [
+ *   { 'user': 'fred' },
+ *   { 'user': 'pebbles' },
+ *   { 'user': 'barney' }
+ * ];
+ *
+ * // using the "_.property" callback shorthand
+ * _.pluck(_.sortBy(users, 'user'), 'user');
+ * // => ['barney', 'fred', 'pebbles']
+ */
+function sortBy(collection, iteratee, thisArg) {
+  var index = -1,
+      length = collection ? collection.length : 0,
+      result = isLength(length) ? Array(length) : [];
+
+  if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
+    iteratee = null;
+  }
+  iteratee = baseCallback(iteratee, thisArg, 3);
+  baseEach(collection, function(value, key, collection) {
+    result[++index] = { 'criteria': iteratee(value, key, collection), 'index': index, 'value': value };
+  });
+  return baseSortBy(result, compareAscending);
+}
+
+module.exports = sortBy;

collection/sortByAll.js

@@ -0,0 +1,53 @@
+var baseEach = require('../internal/baseEach'),
+    baseFlatten = require('../internal/baseFlatten'),
+    baseSortBy = require('../internal/baseSortBy'),
+    compareMultipleAscending = require('../internal/compareMultipleAscending'),
+    isIterateeCall = require('../internal/isIterateeCall'),
+    isLength = require('../internal/isLength');
+
+/**
+ * This method is like `_.sortBy` except that it sorts by property names
+ * instead of an iteratee function.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {...(string|string[])} props The property names to sort by,
+ *  specified as individual property names or arrays of property names.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36 },
+ *   { 'user': 'fred',   'age': 40 },
+ *   { 'user': 'barney', 'age': 26 },
+ *   { 'user': 'fred',   'age': 30 }
+ * ];
+ *
+ * _.map(_.sortByAll(users, ['user', 'age']), _.values);
+ * // => [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
+ */
+function sortByAll(collection) {
+  var args = arguments;
+  if (args.length > 3 && isIterateeCall(args[1], args[2], args[3])) {
+    args = [collection, args[1]];
+  }
+  var index = -1,
+      length = collection ? collection.length : 0,
+      props = baseFlatten(args, false, false, 1),
+      result = isLength(length) ? Array(length) : [];
+
+  baseEach(collection, function(value, key, collection) {
+    var length = props.length,
+        criteria = Array(length);
+
+    while (length--) {
+      criteria[length] = value == null ? undefined : value[props[length]];
+    }
+    result[++index] = { 'criteria': criteria, 'index': index, 'value': value };
+  });
+  return baseSortBy(result, compareMultipleAscending);
+}
+
+module.exports = sortByAll;

collection/where.js

@@ -0,0 +1,35 @@
+var filter = require('./filter'),
+    matches = require('../utility/matches');
+
+/**
+ * Performs a deep comparison between each element in `collection` and the
+ * source object, returning an array of all elements that have equivalent
+ * property values.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to search.
+ * @param {Object} source The object of property values to match.
+ * @returns {Array} Returns the new filtered array.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 36, 'status': 'busy', 'pets': ['hoppy'] },
+ *   { 'user': 'fred',   'age': 40, 'status': 'busy', 'pets': ['baby puss', 'dino'] }
+ * ];
+ *
+ * _.pluck(_.where(users, { 'age': 36 }), 'user');
+ * // => ['barney']
+ *
+ * _.pluck(_.where(users, { 'pets': ['dino'] }), 'user');
+ * // => ['fred']
+ *
+ * _.pluck(_.where(users, { 'status': 'busy' }), 'user');
+ * // => ['barney', 'fred']
+ */
+function where(collection, source) {
+  return filter(collection, matches(source));
+}
+
+module.exports = where;