Bump to v4.6.0.

LICENSE

@@ -0,0 +1,23 @@
+The MIT License (MIT)
+
+Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
+Based on Underscore.js, copyright 2009-2016 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.

LICENSE.txt

@@ -1,22 +0,0 @@
-Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
-Based on Underscore.js, 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

@@ -1,119 +1,40 @@
-# lodash v3.9.3
+# lodash v4.6.0
 
-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
-```
+The [lodash](https://lodash.com/) library exported as [Node.js](https://nodejs.org/) modules.
 
 ## Installation
 
 Using npm:
-
 ```bash
 $ {sudo -H} npm i -g npm
 $ npm i --save lodash
 ```
 
-In Node.js/io.js:
-
+In Node.js:
 ```js
-// load the modern build
+// Load the full build.
 var _ = require('lodash');
-// or a method category
+// Load the core build.
+var _ = require('lodash/core');
+// Load the fp build for immutable auto-curried iteratee-first data-last methods.
+var _ = require('lodash/fp');
+
+// Load a method category.
 var array = require('lodash/array');
-// or a method (great for smaller builds with browserify/webpack)
-var chunk = require('lodash/array/chunk');
+var object = require('lodash/fp/object');
+
+// Load a single method for smaller builds with browserify/rollup/webpack.
+var chunk = require('lodash/chunk');
+var extend = require('lodash/fp/extend');
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/3.9.3-npm) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.6.0-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/3.9.3-amd) & [compatibility](https://github.com/lodash/lodash-compat/tree/3.9.3-amd) builds
- * ES modules for the [modern](https://github.com/lodash/lodash/tree/3.9.3-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)
-  * [Roadmap](https://github.com/lodash/lodash/wiki/Roadmap)
-  * [More Resources](https://github.com/lodash/lodash/wiki/Resources)
-
-## Features
-
- * ~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
- * [_.add](https://lodash.com/docs#add) for mathematical composition
- * [_.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
- * [_.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
- * [_.fill](https://lodash.com/docs#fill) to fill arrays with values
- * [_.findKey](https://lodash.com/docs#findKey) for finding keys
- * [_.flow](https://lodash.com/docs#flow) to complement [_.flowRight](https://lodash.com/docs#flowRight) (a.k.a `_.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
- * [_.get](https://lodash.com/docs#get) & [_.set](https://lodash.com/docs#set) for deep property getting & setting
- * [_.gt](https://lodash.com/docs#gt), [_.gte](https://lodash.com/docs#gte), [_.lt](https://lodash.com/docs#lt), & [_.lte](https://lodash.com/docs#lte) relational methods
- * [_.inRange](https://lodash.com/docs#inRange) for checking whether a number is within a given range
- * [_.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
- * [_.mapKeys](https://lodash.com/docs#mapKeys) for mapping keys to an object
- * [_.matches](https://lodash.com/docs#matches) supports deep object comparisons
- * [_.matchesProperty](https://lodash.com/docs#matchesProperty) to complement [_.matches](https://lodash.com/docs#matches) & [_.property](https://lodash.com/docs#property)
- * [_.method](https://lodash.com/docs#method) & [_.methodOf](https://lodash.com/docs#methodOf) to create functions that invoke methods
- * [_.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
- * [_.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
- * [_.restParam](https://lodash.com/docs#restParam) & [_.spread](https://lodash.com/docs#spread) for applying rest parameters & spreading arguments to functions
- * [_.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#sortByAll) & [_.sortByOrder](https://lodash.com/docs#sortByOrder) for sorting by multiple properties & orders
- * [_.sum](https://lodash.com/docs#sum) to get the sum of values
- * [_.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
- * [_.unzipWith](https://lodash.com/docs#unzipWith) & [_.zipWith](https://lodash.com/docs#zipWith) to specify how grouped values should be combined
- * [_.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)
- * [_.valuesIn](https://lodash.com/docs#valuesIn) for getting values of all enumerable properties
- * [_.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, _.startCase, _.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 customizer callbacks
- * [_.dropWhile](https://lodash.com/docs#dropWhile), [_.takeWhile](https://lodash.com/docs#takeWhile), &
-   [more](https://lodash.com/docs "_.drop, _.dropRight, _.dropRightWhile, _.take, _.takeRight, _.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), [_.findLastKey](https://lodash.com/docs#findLastKey), &
-   [more](https://lodash.com/docs "_.curryRight, _.dropRight, _.dropRightWhile, _.flowRight, _.forEachRight, _.forInRight, _.forOwnRight, _.padRight, partialRight, _.takeRight, _.trimRight, _.takeRightWhile") 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, _.findWhere, _.forEach, _.forEachRight, _.groupBy, _.indexBy, _.invoke, _.map, _.max, _.min, _.partition, _.pluck, _.reduce, _.reduceRight, _.reject, _.shuffle, _.size, _.some, _.sortBy, _.sortByAll, _.sortByOrder, _.sum, _.where") accept strings
- * [_#commit](https://lodash.com/docs#prototype-commit) & [_#plant](https://lodash.com/docs#prototype-plant) for working with chain sequences
- * [_#thru](https://lodash.com/docs#thru) to pass values thru a chain sequence
-
 ## Support
 
-Tested in Chrome 41-42, Firefox 37-38, IE 6-11, MS Edge, Opera 28-29, Safari 5-8, ChakraNode 0.12.2, io.js 2.1.0, Node.js 0.8.28, 0.10.38, & 0.12.4, PhantomJS 1.9.8, RingoJS 0.11, & Rhino 1.7.6.
-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.
+Tested in Chrome 47-48, Firefox 43-44, IE 9-11, Edge 13, Safari 8-9, Node.js 0.10, 0.12, 4, & 5, & PhantomJS 1.9.8.<br>
+Automated [browser](https://saucelabs.com/u/lodash) & [CI](https://travis-ci.org/lodash/lodash/) test runs are available.

_Hash.js

@@ -0,0 +1,18 @@
+var nativeCreate = require('./_nativeCreate');
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Creates an hash object.
+ *
+ * @private
+ * @constructor
+ * @returns {Object} Returns the new hash object.
+ */
+function Hash() {}
+
+// Avoid inheriting from `Object.prototype` when possible.
+Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto;
+
+module.exports = Hash;

_LazyWrapper.js

@@ -1,24 +1,24 @@
-var baseCreate = require('./baseCreate'),
-    baseLodash = require('./baseLodash');
+var baseCreate = require('./_baseCreate'),
+    baseLodash = require('./_baseLodash');
 
-/** Used as references for `-Infinity` and `Infinity`. */
-var POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
+/** Used as references for the maximum length and index of an array. */
+var MAX_ARRAY_LENGTH = 4294967295;
 
 /**
  * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
  *
  * @private
+ * @constructor
  * @param {*} value The value to wrap.
  */
 function LazyWrapper(value) {
   this.__wrapped__ = value;
-  this.__actions__ = null;
+  this.__actions__ = [];
   this.__dir__ = 1;
-  this.__dropCount__ = 0;
   this.__filtered__ = false;
-  this.__iteratees__ = null;
-  this.__takeCount__ = POSITIVE_INFINITY;
-  this.__views__ = null;
+  this.__iteratees__ = [];
+  this.__takeCount__ = MAX_ARRAY_LENGTH;
+  this.__views__ = [];
 }
 
 LazyWrapper.prototype = baseCreate(baseLodash.prototype);

_LodashWrapper.js

@@ -1,5 +1,5 @@
-var baseCreate = require('./baseCreate'),
-    baseLodash = require('./baseLodash');
+var baseCreate = require('./_baseCreate'),
+    baseLodash = require('./_baseLodash');
 
 /**
  * The base constructor for creating `lodash` wrapper objects.
@@ -7,12 +7,13 @@ var baseCreate = require('./baseCreate'),
  * @private
  * @param {*} value The value to wrap.
  * @param {boolean} [chainAll] Enable chaining for all wrapper methods.
- * @param {Array} [actions=[]] Actions to peform to resolve the unwrapped value.
  */
-function LodashWrapper(value, chainAll, actions) {
+function LodashWrapper(value, chainAll) {
   this.__wrapped__ = value;
-  this.__actions__ = actions || [];
+  this.__actions__ = [];
   this.__chain__ = !!chainAll;
+  this.__index__ = 0;
+  this.__values__ = undefined;
 }
 
 LodashWrapper.prototype = baseCreate(baseLodash.prototype);

_Map.js

@@ -0,0 +1,7 @@
+var getNative = require('./_getNative'),
+    root = require('./_root');
+
+/* Built-in method references that are verified to be native. */
+var Map = getNative(root, 'Map');
+
+module.exports = Map;

_MapCache.js

@@ -0,0 +1,32 @@
+var mapClear = require('./_mapClear'),
+    mapDelete = require('./_mapDelete'),
+    mapGet = require('./_mapGet'),
+    mapHas = require('./_mapHas'),
+    mapSet = require('./_mapSet');
+
+/**
+ * Creates a map cache object to store key-value pairs.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [values] The values to cache.
+ */
+function MapCache(values) {
+  var index = -1,
+      length = values ? values.length : 0;
+
+  this.clear();
+  while (++index < length) {
+    var entry = values[index];
+    this.set(entry[0], entry[1]);
+  }
+}
+
+// Add functions to the `MapCache`.
+MapCache.prototype.clear = mapClear;
+MapCache.prototype['delete'] = mapDelete;
+MapCache.prototype.get = mapGet;
+MapCache.prototype.has = mapHas;
+MapCache.prototype.set = mapSet;
+
+module.exports = MapCache;

_Reflect.js

@@ -0,0 +1,6 @@
+var root = require('./_root');
+
+/** Built-in value references. */
+var Reflect = root.Reflect;
+
+module.exports = Reflect;

_Set.js

@@ -0,0 +1,7 @@
+var getNative = require('./_getNative'),
+    root = require('./_root');
+
+/* Built-in method references that are verified to be native. */
+var Set = getNative(root, 'Set');
+
+module.exports = Set;

_SetCache.js

@@ -0,0 +1,25 @@
+var MapCache = require('./_MapCache'),
+    cachePush = require('./_cachePush');
+
+/**
+ *
+ * Creates a set cache object to store unique values.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [values] The values to cache.
+ */
+function SetCache(values) {
+  var index = -1,
+      length = values ? values.length : 0;
+
+  this.__data__ = new MapCache;
+  while (++index < length) {
+    this.push(values[index]);
+  }
+}
+
+// Add functions to the `SetCache`.
+SetCache.prototype.push = cachePush;
+
+module.exports = SetCache;

_Stack.js

@@ -0,0 +1,32 @@
+var stackClear = require('./_stackClear'),
+    stackDelete = require('./_stackDelete'),
+    stackGet = require('./_stackGet'),
+    stackHas = require('./_stackHas'),
+    stackSet = require('./_stackSet');
+
+/**
+ * Creates a stack cache object to store key-value pairs.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [values] The values to cache.
+ */
+function Stack(values) {
+  var index = -1,
+      length = values ? values.length : 0;
+
+  this.clear();
+  while (++index < length) {
+    var entry = values[index];
+    this.set(entry[0], entry[1]);
+  }
+}
+
+// Add functions to the `Stack` cache.
+Stack.prototype.clear = stackClear;
+Stack.prototype['delete'] = stackDelete;
+Stack.prototype.get = stackGet;
+Stack.prototype.has = stackHas;
+Stack.prototype.set = stackSet;
+
+module.exports = Stack;

_Symbol.js

@@ -0,0 +1,6 @@
+var root = require('./_root');
+
+/** Built-in value references. */
+var Symbol = root.Symbol;
+
+module.exports = Symbol;

_Uint8Array.js

@@ -0,0 +1,6 @@
+var root = require('./_root');
+
+/** Built-in value references. */
+var Uint8Array = root.Uint8Array;
+
+module.exports = Uint8Array;

_WeakMap.js

@@ -0,0 +1,7 @@
+var getNative = require('./_getNative'),
+    root = require('./_root');
+
+/* Built-in method references that are verified to be native. */
+var WeakMap = getNative(root, 'WeakMap');
+
+module.exports = WeakMap;

_addMapEntry.js

@@ -0,0 +1,15 @@
+/**
+ * Adds the key-value `pair` to `map`.
+ *
+ * @private
+ * @param {Object} map The map to modify.
+ * @param {Array} pair The key-value pair to add.
+ * @returns {Object} Returns `map`.
+ */
+function addMapEntry(map, pair) {
+  // Don't return `Map#set` because it doesn't return the map instance in IE 11.
+  map.set(pair[0], pair[1]);
+  return map;
+}
+
+module.exports = addMapEntry;

_addSetEntry.js

@@ -0,0 +1,14 @@
+/**
+ * Adds `value` to `set`.
+ *
+ * @private
+ * @param {Object} set The set to modify.
+ * @param {*} value The value to add.
+ * @returns {Object} Returns `set`.
+ */
+function addSetEntry(set, value) {
+  set.add(value);
+  return set;
+}
+
+module.exports = addSetEntry;

_apply.js

@@ -0,0 +1,22 @@
+/**
+ * A faster alternative to `Function#apply`, this function invokes `func`
+ * with the `this` binding of `thisArg` and the arguments of `args`.
+ *
+ * @private
+ * @param {Function} func The function to invoke.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {...*} args The arguments to invoke `func` with.
+ * @returns {*} Returns the result of `func`.
+ */
+function apply(func, thisArg, args) {
+  var length = args.length;
+  switch (length) {
+    case 0: return func.call(thisArg);
+    case 1: return func.call(thisArg, args[0]);
+    case 2: return func.call(thisArg, args[0], args[1]);
+    case 3: return func.call(thisArg, args[0], args[1], args[2]);
+  }
+  return func.apply(thisArg, args);
+}
+
+module.exports = apply;

_arrayAggregator.js

@@ -0,0 +1,22 @@
+/**
+ * A specialized version of `baseAggregator` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+function arrayAggregator(array, setter, iteratee, accumulator) {
+  var index = -1,
+      length = array.length;
+
+  while (++index < length) {
+    var value = array[index];
+    setter(accumulator, value, iteratee(value), array);
+  }
+  return accumulator;
+}
+
+module.exports = arrayAggregator;

_arrayConcat.js

@@ -0,0 +1,25 @@
+/**
+ * Creates a new array concatenating `array` with `other`.
+ *
+ * @private
+ * @param {Array} array The first array to concatenate.
+ * @param {Array} other The second array to concatenate.
+ * @returns {Array} Returns the new concatenated array.
+ */
+function arrayConcat(array, other) {
+  var index = -1,
+      length = array.length,
+      othIndex = -1,
+      othLength = other.length,
+      result = Array(length + othLength);
+
+  while (++index < length) {
+    result[index] = array[index];
+  }
+  while (++othIndex < othLength) {
+    result[index++] = other[othIndex];
+  }
+  return result;
+}
+
+module.exports = arrayConcat;

_arrayEach.js

@@ -1,6 +1,6 @@
 /**
- * A specialized version of `_.forEach` for arrays without support for callback
- * shorthands and `this` binding.
+ * A specialized version of `_.forEach` for arrays without support for
+ * iteratee shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.

_arrayEachRight.js

@@ -1,6 +1,6 @@
 /**
  * A specialized version of `_.forEachRight` for arrays without support for
- * callback shorthands and `this` binding.
+ * iteratee shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.

_arrayEvery.js

@@ -1,12 +1,11 @@
 /**
- * A specialized version of `_.every` for arrays without support for callback
- * shorthands and `this` binding.
+ * A specialized version of `_.every` for arrays without support for
+ * iteratee shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.
  * @param {Function} predicate The function invoked per iteration.
- * @returns {boolean} Returns `true` if all elements pass the predicate check,
- *  else `false`.
+ * @returns {boolean} Returns `true` if all elements pass the predicate check, else `false`.
  */
 function arrayEvery(array, predicate) {
   var index = -1,

_arrayFilter.js

@@ -1,6 +1,6 @@
 /**
- * A specialized version of `_.filter` for arrays without support for callback
- * shorthands and `this` binding.
+ * A specialized version of `_.filter` for arrays without support for
+ * iteratee shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.
@@ -10,13 +10,13 @@
 function arrayFilter(array, predicate) {
   var index = -1,
       length = array.length,
-      resIndex = -1,
+      resIndex = 0,
       result = [];
 
   while (++index < length) {
     var value = array[index];
     if (predicate(value, index, array)) {
-      result[++resIndex] = value;
+      result[resIndex++] = value;
     }
   }
   return result;

_arrayIncludes.js

@@ -0,0 +1,16 @@
+var baseIndexOf = require('./_baseIndexOf');
+
+/**
+ * A specialized version of `_.includes` for arrays without support for
+ * specifying an index to search from.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {*} target The value to search for.
+ * @returns {boolean} Returns `true` if `target` is found, else `false`.
+ */
+function arrayIncludes(array, value) {
+  return !!array.length && baseIndexOf(array, value, 0) > -1;
+}
+
+module.exports = arrayIncludes;

_arrayIncludesWith.js

@@ -0,0 +1,22 @@
+/**
+ * This function is like `arrayIncludes` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {*} target The value to search for.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {boolean} Returns `true` if `target` is found, else `false`.
+ */
+function arrayIncludesWith(array, value, comparator) {
+  var index = -1,
+      length = array.length;
+
+  while (++index < length) {
+    if (comparator(value, array[index])) {
+      return true;
+    }
+  }
+  return false;
+}
+
+module.exports = arrayIncludesWith;

_arrayMap.js

@@ -1,6 +1,6 @@
 /**
- * A specialized version of `_.map` for arrays without support for callback
- * shorthands and `this` binding.
+ * A specialized version of `_.map` for arrays without support for iteratee
+ * shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.

_arrayPush.js

@@ -0,0 +1,20 @@
+/**
+ * Appends the elements of `values` to `array`.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to append.
+ * @returns {Array} Returns `array`.
+ */
+function arrayPush(array, values) {
+  var index = -1,
+      length = values.length,
+      offset = array.length;
+
+  while (++index < length) {
+    array[offset + index] = values[index];
+  }
+  return array;
+}
+
+module.exports = arrayPush;

_arrayReduce.js

@@ -1,20 +1,19 @@
 /**
- * A specialized version of `_.reduce` for arrays without support for callback
- * shorthands and `this` binding.
+ * A specialized version of `_.reduce` for arrays without support for
+ * iteratee shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
- * @param {boolean} [initFromArray] Specify using the first element of `array`
- *  as the initial value.
+ * @param {boolean} [initAccum] Specify using the first element of `array` as the initial value.
  * @returns {*} Returns the accumulated value.
  */
-function arrayReduce(array, iteratee, accumulator, initFromArray) {
+function arrayReduce(array, iteratee, accumulator, initAccum) {
   var index = -1,
       length = array.length;
 
-  if (initFromArray && length) {
+  if (initAccum && length) {
     accumulator = array[++index];
   }
   while (++index < length) {

_arrayReduceRight.js

@@ -1,18 +1,17 @@
 /**
  * A specialized version of `_.reduceRight` for arrays without support for
- * callback shorthands and `this` binding.
+ * iteratee shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
- * @param {boolean} [initFromArray] Specify using the last element of `array`
- *  as the initial value.
+ * @param {boolean} [initAccum] Specify using the last element of `array` as the initial value.
  * @returns {*} Returns the accumulated value.
  */
-function arrayReduceRight(array, iteratee, accumulator, initFromArray) {
+function arrayReduceRight(array, iteratee, accumulator, initAccum) {
   var length = array.length;
-  if (initFromArray && length) {
+  if (initAccum && length) {
     accumulator = array[--length];
   }
   while (length--) {

_arraySome.js

@@ -1,12 +1,11 @@
 /**
- * A specialized version of `_.some` for arrays without support for callback
- * shorthands and `this` binding.
+ * A specialized version of `_.some` for arrays without support for iteratee
+ * shorthands.
  *
  * @private
  * @param {Array} array The array to iterate over.
  * @param {Function} predicate The function invoked per iteration.
- * @returns {boolean} Returns `true` if any element passes the predicate check,
- *  else `false`.
+ * @returns {boolean} Returns `true` if any element passes the predicate check, else `false`.
  */
 function arraySome(array, predicate) {
   var index = -1,

_assignInDefaults.js

@@ -0,0 +1,27 @@
+var eq = require('./eq');
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Used by `_.defaults` to customize its `_.assignIn` use.
+ *
+ * @private
+ * @param {*} objValue The destination value.
+ * @param {*} srcValue The source value.
+ * @param {string} key The key of the property to assign.
+ * @param {Object} object The parent object of `objValue`.
+ * @returns {*} Returns the value to assign.
+ */
+function assignInDefaults(objValue, srcValue, key, object) {
+  if (objValue === undefined ||
+      (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+    return srcValue;
+  }
+  return objValue;
+}
+
+module.exports = assignInDefaults;

_assignMergeValue.js

@@ -0,0 +1,19 @@
+var eq = require('./eq');
+
+/**
+ * This function is like `assignValue` except that it doesn't assign
+ * `undefined` values.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function assignMergeValue(object, key, value) {
+  if ((value !== undefined && !eq(object[key], value)) ||
+      (typeof key == 'number' && value === undefined && !(key in object))) {
+    object[key] = value;
+  }
+}
+
+module.exports = assignMergeValue;

_assignValue.js

@@ -0,0 +1,27 @@
+var eq = require('./eq');
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Assigns `value` to `key` of `object` if the existing value is not equivalent
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function assignValue(object, key, value) {
+  var objValue = object[key];
+  if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
+      (value === undefined && !(key in object))) {
+    object[key] = value;
+  }
+}
+
+module.exports = assignValue;

_assocDelete.js

@@ -0,0 +1,31 @@
+var assocIndexOf = require('./_assocIndexOf');
+
+/** Used for built-in method references. */
+var arrayProto = Array.prototype;
+
+/** Built-in value references. */
+var splice = arrayProto.splice;
+
+/**
+ * Removes `key` and its value from the associative array.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+function assocDelete(array, key) {
+  var index = assocIndexOf(array, key);
+  if (index < 0) {
+    return false;
+  }
+  var lastIndex = array.length - 1;
+  if (index == lastIndex) {
+    array.pop();
+  } else {
+    splice.call(array, index, 1);
+  }
+  return true;
+}
+
+module.exports = assocDelete;

_assocGet.js

@@ -0,0 +1,16 @@
+var assocIndexOf = require('./_assocIndexOf');
+
+/**
+ * Gets the associative array value for `key`.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+function assocGet(array, key) {
+  var index = assocIndexOf(array, key);
+  return index < 0 ? undefined : array[index][1];
+}
+
+module.exports = assocGet;

_assocHas.js

@@ -0,0 +1,15 @@
+var assocIndexOf = require('./_assocIndexOf');
+
+/**
+ * Checks if an associative array value for `key` exists.
+ *
+ * @private
+ * @param {Array} array The array to query.
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+function assocHas(array, key) {
+  return assocIndexOf(array, key) > -1;
+}
+
+module.exports = assocHas;

_assocIndexOf.js

@@ -0,0 +1,22 @@
+var eq = require('./eq');
+
+/**
+ * Gets the index at which the first occurrence of `key` is found in `array`
+ * of key-value pairs.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {*} key The key to search for.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function assocIndexOf(array, key) {
+  var length = array.length;
+  while (length--) {
+    if (eq(array[length][0], key)) {
+      return length;
+    }
+  }
+  return -1;
+}
+
+module.exports = assocIndexOf;

_assocSet.js

@@ -0,0 +1,20 @@
+var assocIndexOf = require('./_assocIndexOf');
+
+/**
+ * Sets the associative array `key` to `value`.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ */
+function assocSet(array, key, value) {
+  var index = assocIndexOf(array, key);
+  if (index < 0) {
+    array.push([key, value]);
+  } else {
+    array[index][1] = value;
+  }
+}
+
+module.exports = assocSet;

_baseAggregator.js

@@ -0,0 +1,21 @@
+var baseEach = require('./_baseEach');
+
+/**
+ * Aggregates elements of `collection` on `accumulator` with keys transformed
+ * by `iteratee` and values set by `setter`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform keys.
+ * @param {Object} accumulator The initial aggregated object.
+ * @returns {Function} Returns `accumulator`.
+ */
+function baseAggregator(collection, setter, iteratee, accumulator) {
+  baseEach(collection, function(value, key, collection) {
+    setter(accumulator, value, iteratee(value), collection);
+  });
+  return accumulator;
+}
+
+module.exports = baseAggregator;

_baseAssign.js

@@ -0,0 +1,17 @@
+var copyObject = require('./_copyObject'),
+    keys = require('./keys');
+
+/**
+ * The base implementation of `_.assign` without support for multiple sources
+ * or `customizer` functions.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @returns {Object} Returns `object`.
+ */
+function baseAssign(object, source) {
+  return object && copyObject(source, keys(source), object);
+}
+
+module.exports = baseAssign;

_baseAt.js

@@ -0,0 +1,23 @@
+var get = require('./get');
+
+/**
+ * The base implementation of `_.at` without support for individual paths.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {string[]} paths The property paths of elements to pick.
+ * @returns {Array} Returns the new array of picked elements.
+ */
+function baseAt(object, paths) {
+  var index = -1,
+      isNil = object == null,
+      length = paths.length,
+      result = Array(length);
+
+  while (++index < length) {
+    result[index] = isNil ? undefined : get(object, paths[index]);
+  }
+  return result;
+}
+
+module.exports = baseAt;

_baseCastArrayLikeObject.js

@@ -0,0 +1,14 @@
+var isArrayLikeObject = require('./isArrayLikeObject');
+
+/**
+ * Casts `value` to an empty array if it's not an array like object.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the array-like object.
+ */
+function baseCastArrayLikeObject(value) {
+  return isArrayLikeObject(value) ? value : [];
+}
+
+module.exports = baseCastArrayLikeObject;

_baseCastFunction.js

@@ -0,0 +1,14 @@
+var identity = require('./identity');
+
+/**
+ * Casts `value` to `identity` if it's not a function.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the array-like object.
+ */
+function baseCastFunction(value) {
+  return typeof value == 'function' ? value : identity;
+}
+
+module.exports = baseCastFunction;

_baseCastPath.js

@@ -0,0 +1,15 @@
+var isArray = require('./isArray'),
+    stringToPath = require('./_stringToPath');
+
+/**
+ * Casts `value` to a path array if it's not one.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the cast property path array.
+ */
+function baseCastPath(value) {
+  return isArray(value) ? value : stringToPath(value);
+}
+
+module.exports = baseCastPath;

_baseClamp.js

@@ -0,0 +1,22 @@
+/**
+ * The base implementation of `_.clamp` which doesn't coerce arguments to numbers.
+ *
+ * @private
+ * @param {number} number The number to clamp.
+ * @param {number} [lower] The lower bound.
+ * @param {number} upper The upper bound.
+ * @returns {number} Returns the clamped number.
+ */
+function baseClamp(number, lower, upper) {
+  if (number === number) {
+    if (upper !== undefined) {
+      number = number <= upper ? number : upper;
+    }
+    if (lower !== undefined) {
+      number = number >= lower ? number : lower;
+    }
+  }
+  return number;
+}
+
+module.exports = baseClamp;

_baseClone.js

@@ -1,12 +1,19 @@
-var arrayCopy = require('./arrayCopy'),
-    arrayEach = require('./arrayEach'),
-    baseAssign = require('./baseAssign'),
-    baseForOwn = require('./baseForOwn'),
-    initCloneArray = require('./initCloneArray'),
-    initCloneByTag = require('./initCloneByTag'),
-    initCloneObject = require('./initCloneObject'),
-    isArray = require('../lang/isArray'),
-    isObject = require('../lang/isObject');
+var Stack = require('./_Stack'),
+    arrayEach = require('./_arrayEach'),
+    assignValue = require('./_assignValue'),
+    baseAssign = require('./_baseAssign'),
+    baseForOwn = require('./_baseForOwn'),
+    cloneBuffer = require('./_cloneBuffer'),
+    copyArray = require('./_copyArray'),
+    copySymbols = require('./_copySymbols'),
+    getTag = require('./_getTag'),
+    initCloneArray = require('./_initCloneArray'),
+    initCloneByTag = require('./_initCloneByTag'),
+    initCloneObject = require('./_initCloneObject'),
+    isArray = require('./isArray'),
+    isBuffer = require('./isBuffer'),
+    isHostObject = require('./_isHostObject'),
+    isObject = require('./isObject');
 
 /** `Object#toString` result references. */
 var argsTag = '[object Arguments]',
@@ -15,12 +22,14 @@ var argsTag = '[object Arguments]',
     dateTag = '[object Date]',
     errorTag = '[object Error]',
     funcTag = '[object Function]',
+    genTag = '[object GeneratorFunction]',
     mapTag = '[object Map]',
     numberTag = '[object Number]',
     objectTag = '[object Object]',
     regexpTag = '[object RegExp]',
     setTag = '[object Set]',
     stringTag = '[object String]',
+    symbolTag = '[object Symbol]',
     weakMapTag = '[object WeakMap]';
 
 var arrayBufferTag = '[object ArrayBuffer]',
@@ -41,41 +50,32 @@ cloneableTags[arrayBufferTag] = cloneableTags[boolTag] =
 cloneableTags[dateTag] = cloneableTags[float32Tag] =
 cloneableTags[float64Tag] = cloneableTags[int8Tag] =
 cloneableTags[int16Tag] = cloneableTags[int32Tag] =
-cloneableTags[numberTag] = cloneableTags[objectTag] =
-cloneableTags[regexpTag] = cloneableTags[stringTag] =
-cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
-cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
+cloneableTags[mapTag] = cloneableTags[numberTag] =
+cloneableTags[objectTag] = cloneableTags[regexpTag] =
+cloneableTags[setTag] = cloneableTags[stringTag] =
+cloneableTags[symbolTag] = cloneableTags[uint8Tag] =
+cloneableTags[uint8ClampedTag] = cloneableTags[uint16Tag] =
+cloneableTags[uint32Tag] = true;
 cloneableTags[errorTag] = cloneableTags[funcTag] =
-cloneableTags[mapTag] = cloneableTags[setTag] =
 cloneableTags[weakMapTag] = false;
 
-/** Used for native method references. */
-var objectProto = Object.prototype;
-
 /**
- * Used to resolve the [`toStringTag`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring)
- * of values.
- */
-var objToString = objectProto.toString;
-
-/**
- * The base implementation of `_.clone` without support for argument juggling
- * and `this` binding `customizer` functions.
+ * The base implementation of `_.clone` and `_.cloneDeep` which tracks
+ * traversed objects.
  *
  * @private
  * @param {*} value The value to clone.
  * @param {boolean} [isDeep] Specify a deep clone.
- * @param {Function} [customizer] The function to customize cloning values.
+ * @param {Function} [customizer] The function to customize cloning.
  * @param {string} [key] The key of `value`.
- * @param {Object} [object] The object `value` belongs to.
- * @param {Array} [stackA=[]] Tracks traversed source objects.
- * @param {Array} [stackB=[]] Associates clones with source counterparts.
+ * @param {Object} [object] The parent object of `value`.
+ * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
  * @returns {*} Returns the cloned value.
  */
-function baseClone(value, isDeep, customizer, key, object, stackA, stackB) {
+function baseClone(value, isDeep, customizer, key, object, stack) {
   var result;
   if (customizer) {
-    result = object ? customizer(value, key, object) : customizer(value);
+    result = object ? customizer(value, key, object, stack) : customizer(value);
   }
   if (result !== undefined) {
     return result;
@@ -87,42 +87,43 @@ function baseClone(value, isDeep, customizer, key, object, stackA, stackB) {
   if (isArr) {
     result = initCloneArray(value);
     if (!isDeep) {
-      return arrayCopy(value, result);
+      return copyArray(value, result);
     }
   } else {
-    var tag = objToString.call(value),
-        isFunc = tag == funcTag;
+    var tag = getTag(value),
+        isFunc = tag == funcTag || tag == genTag;
 
+    if (isBuffer(value)) {
+      return cloneBuffer(value, isDeep);
+    }
     if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
+      if (isHostObject(value)) {
+        return object ? value : {};
+      }
       result = initCloneObject(isFunc ? {} : value);
       if (!isDeep) {
-        return baseAssign(result, value);
+        return copySymbols(value, baseAssign(result, value));
       }
     } else {
-      return cloneableTags[tag]
-        ? initCloneByTag(value, tag, isDeep)
-        : (object ? value : {});
+      if (!cloneableTags[tag]) {
+        return object ? value : {};
+      }
+      result = initCloneByTag(value, tag, isDeep);
     }
   }
-  // Check for circular references and return corresponding clone.
-  stackA || (stackA = []);
-  stackB || (stackB = []);
-
-  var length = stackA.length;
-  while (length--) {
-    if (stackA[length] == value) {
-      return stackB[length];
-    }
+  // Check for circular references and return its corresponding clone.
+  stack || (stack = new Stack);
+  var stacked = stack.get(value);
+  if (stacked) {
+    return stacked;
   }
-  // Add the source value to the stack of traversed objects and associate it with its clone.
-  stackA.push(value);
-  stackB.push(result);
+  stack.set(value, result);
 
   // Recursively populate clone (susceptible to call stack limits).
   (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) {
-    result[key] = baseClone(subValue, isDeep, customizer, key, value, stackA, stackB);
+    assignValue(result, key, baseClone(subValue, isDeep, customizer, key, value, stack));
   });
-  return result;
+  return isArr ? result : copySymbols(value, result);
 }
 
 module.exports = baseClone;

_baseConforms.js

@@ -0,0 +1,32 @@
+var keys = require('./keys');
+
+/**
+ * The base implementation of `_.conforms` which doesn't clone `source`.
+ *
+ * @private
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {Function} Returns the new function.
+ */
+function baseConforms(source) {
+  var props = keys(source),
+      length = props.length;
+
+  return function(object) {
+    if (object == null) {
+      return !length;
+    }
+    var index = length;
+    while (index--) {
+      var key = props[index],
+          predicate = source[key],
+          value = object[key];
+
+      if ((value === undefined && !(key in Object(object))) || !predicate(value)) {
+        return false;
+      }
+    }
+    return true;
+  };
+}
+
+module.exports = baseConforms;

_baseCreate.js

@@ -0,0 +1,18 @@
+var isObject = require('./isObject');
+
+/** Built-in value references. */
+var objectCreate = Object.create;
+
+/**
+ * The base implementation of `_.create` without support for assigning
+ * properties to the created object.
+ *
+ * @private
+ * @param {Object} prototype The object to inherit from.
+ * @returns {Object} Returns the new object.
+ */
+function baseCreate(proto) {
+  return isObject(proto) ? objectCreate(proto) : {};
+}
+
+module.exports = baseCreate;

_baseDelay.js

@@ -2,13 +2,13 @@
 var FUNC_ERROR_TEXT = 'Expected a function';
 
 /**
- * The base implementation of `_.delay` and `_.defer` which accepts an index
- * of where to slice the arguments to provide to `func`.
+ * The base implementation of `_.delay` and `_.defer` which accepts an array
+ * of `func` arguments.
  *
  * @private
  * @param {Function} func The function to delay.
  * @param {number} wait The number of milliseconds to delay invocation.
- * @param {Object} args The arguments provide to `func`.
+ * @param {Object} args The arguments to provide to `func`.
  * @returns {number} Returns the timer id.
  */
 function baseDelay(func, wait, args) {

_baseDifference.js

@@ -0,0 +1,66 @@
+var SetCache = require('./_SetCache'),
+    arrayIncludes = require('./_arrayIncludes'),
+    arrayIncludesWith = require('./_arrayIncludesWith'),
+    arrayMap = require('./_arrayMap'),
+    baseUnary = require('./_baseUnary'),
+    cacheHas = require('./_cacheHas');
+
+/** Used as the size to enable large array optimizations. */
+var LARGE_ARRAY_SIZE = 200;
+
+/**
+ * The base implementation of methods like `_.difference` without support for
+ * excluding multiple arrays or iteratee shorthands.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Array} values The values to exclude.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ */
+function baseDifference(array, values, iteratee, comparator) {
+  var index = -1,
+      includes = arrayIncludes,
+      isCommon = true,
+      length = array.length,
+      result = [],
+      valuesLength = values.length;
+
+  if (!length) {
+    return result;
+  }
+  if (iteratee) {
+    values = arrayMap(values, baseUnary(iteratee));
+  }
+  if (comparator) {
+    includes = arrayIncludesWith;
+    isCommon = false;
+  }
+  else if (values.length >= LARGE_ARRAY_SIZE) {
+    includes = cacheHas;
+    isCommon = false;
+    values = new SetCache(values);
+  }
+  outer:
+  while (++index < length) {
+    var value = array[index],
+        computed = iteratee ? iteratee(value) : value;
+
+    if (isCommon && computed === computed) {
+      var valuesIndex = valuesLength;
+      while (valuesIndex--) {
+        if (values[valuesIndex] === computed) {
+          continue outer;
+        }
+      }
+      result.push(value);
+    }
+    else if (!includes(values, computed, comparator)) {
+      result.push(value);
+    }
+  }
+  return result;
+}
+
+module.exports = baseDifference;

_baseEach.js

@@ -0,0 +1,14 @@
+var baseForOwn = require('./_baseForOwn'),
+    createBaseEach = require('./_createBaseEach');
+
+/**
+ * The base implementation of `_.forEach` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ */
+var baseEach = createBaseEach(baseForOwn);
+
+module.exports = baseEach;

_baseEachRight.js

@@ -0,0 +1,14 @@
+var baseForOwnRight = require('./_baseForOwnRight'),
+    createBaseEach = require('./_createBaseEach');
+
+/**
+ * The base implementation of `_.forEachRight` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ */
+var baseEachRight = createBaseEach(baseForOwnRight, true);
+
+module.exports = baseEachRight;

_baseEvery.js

@@ -1,14 +1,12 @@
-var baseEach = require('./baseEach');
+var baseEach = require('./_baseEach');
 
 /**
- * The base implementation of `_.every` without support for callback
- * shorthands and `this` binding.
+ * The base implementation of `_.every` without support for iteratee shorthands.
  *
  * @private
- * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Array|Object} collection The collection to iterate over.
  * @param {Function} predicate The function invoked per iteration.
- * @returns {boolean} Returns `true` if all elements pass the predicate check,
- *  else `false`
+ * @returns {boolean} Returns `true` if all elements pass the predicate check, else `false`
  */
 function baseEvery(collection, predicate) {
   var result = true;

_baseExtremum.js

@@ -0,0 +1,30 @@
+/**
+ * The base implementation of methods like `_.max` and `_.min` which accepts a
+ * `comparator` to determine the extremum value.
+ *
+ * @private
+ * @param {Array} array The array to iterate over.
+ * @param {Function} iteratee The iteratee invoked per iteration.
+ * @param {Function} comparator The comparator used to compare values.
+ * @returns {*} Returns the extremum value.
+ */
+function baseExtremum(array, iteratee, comparator) {
+  var index = -1,
+      length = array.length;
+
+  while (++index < length) {
+    var value = array[index],
+        current = iteratee(value);
+
+    if (current != null && (computed === undefined
+          ? current === current
+          : comparator(current, computed)
+        )) {
+      var computed = current,
+          result = value;
+    }
+  }
+  return result;
+}
+
+module.exports = baseExtremum;

_baseFill.js

@@ -1,3 +1,6 @@
+var toInteger = require('./toInteger'),
+    toLength = require('./toLength');
+
 /**
  * The base implementation of `_.fill` without an iteratee call guard.
  *
@@ -11,18 +14,16 @@
 function baseFill(array, value, start, end) {
   var length = array.length;
 
-  start = start == null ? 0 : (+start || 0);
+  start = toInteger(start);
   if (start < 0) {
     start = -start > length ? 0 : (length + start);
   }
-  end = (end === undefined || end > length) ? length : (+end || 0);
+  end = (end === undefined || end > length) ? length : toInteger(end);
   if (end < 0) {
     end += length;
   }
-  length = start > end ? 0 : (end >>> 0);
-  start >>>= 0;
-
-  while (start < length) {
+  end = start > end ? 0 : toLength(end);
+  while (start < end) {
     array[start++] = value;
   }
   return array;

_baseFilter.js

@@ -1,11 +1,10 @@
-var baseEach = require('./baseEach');
+var baseEach = require('./_baseEach');
 
 /**
- * The base implementation of `_.filter` without support for callback
- * shorthands and `this` binding.
+ * The base implementation of `_.filter` without support for iteratee shorthands.
  *
  * @private
- * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Array|Object} collection The collection to iterate over.
  * @param {Function} predicate The function invoked per iteration.
  * @returns {Array} Returns the new filtered array.
  */

_baseFind.js

@@ -1,14 +1,13 @@
 /**
- * The base implementation of `_.find`, `_.findLast`, `_.findKey`, and `_.findLastKey`,
- * without support for callback shorthands and `this` binding, which iterates
- * over `collection` using the provided `eachFunc`.
+ * The base implementation of methods like `_.find` and `_.findKey`, without
+ * support for iteratee shorthands, which iterates over `collection` using
+ * `eachFunc`.
  *
  * @private
- * @param {Array|Object|string} collection The collection to search.
+ * @param {Array|Object} collection The collection to search.
  * @param {Function} predicate The function invoked per iteration.
  * @param {Function} eachFunc The function to iterate over `collection`.
- * @param {boolean} [retKey] Specify returning the key of the found element
- *  instead of the element itself.
+ * @param {boolean} [retKey] Specify returning the key of the found element instead of the element itself.
  * @returns {*} Returns the found element or its key, else `undefined`.
  */
 function baseFind(collection, predicate, eachFunc, retKey) {

_baseFindIndex.js

@@ -1,6 +1,6 @@
 /**
  * The base implementation of `_.findIndex` and `_.findLastIndex` without
- * support for callback shorthands and `this` binding.
+ * support for iteratee shorthands.
  *
  * @private
  * @param {Array} array The array to search.

_baseFlatten.js

@@ -0,0 +1,39 @@
+var arrayPush = require('./_arrayPush'),
+    isArguments = require('./isArguments'),
+    isArray = require('./isArray'),
+    isArrayLikeObject = require('./isArrayLikeObject');
+
+/**
+ * The base implementation of `_.flatten` with support for restricting flattening.
+ *
+ * @private
+ * @param {Array} array The array to flatten.
+ * @param {number} depth The maximum recursion depth.
+ * @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
+ * @param {Array} [result=[]] The initial result value.
+ * @returns {Array} Returns the new flattened array.
+ */
+function baseFlatten(array, depth, isStrict, result) {
+  result || (result = []);
+
+  var index = -1,
+      length = array.length;
+
+  while (++index < length) {
+    var value = array[index];
+    if (depth > 0 && isArrayLikeObject(value) &&
+        (isStrict || isArray(value) || isArguments(value))) {
+      if (depth > 1) {
+        // Recursively flatten arrays (susceptible to call stack limits).
+        baseFlatten(value, depth - 1, isStrict, result);
+      } else {
+        arrayPush(result, value);
+      }
+    } else if (!isStrict) {
+      result[result.length] = value;
+    }
+  }
+  return result;
+}
+
+module.exports = baseFlatten;

_baseFor.js

@@ -1,4 +1,4 @@
-var createBaseFor = require('./createBaseFor');
+var createBaseFor = require('./_createBaseFor');
 
 /**
  * The base implementation of `baseForIn` and `baseForOwn` which iterates

_baseForIn.js

@@ -1,9 +1,8 @@
-var baseFor = require('./baseFor'),
-    keysIn = require('../object/keysIn');
+var baseFor = require('./_baseFor'),
+    keysIn = require('./keysIn');
 
 /**
- * The base implementation of `_.forIn` without support for callback
- * shorthands and `this` binding.
+ * The base implementation of `_.forIn` without support for iteratee shorthands.
  *
  * @private
  * @param {Object} object The object to iterate over.
@@ -11,7 +10,7 @@ var baseFor = require('./baseFor'),
  * @returns {Object} Returns `object`.
  */
 function baseForIn(object, iteratee) {
-  return baseFor(object, iteratee, keysIn);
+  return object == null ? object : baseFor(object, iteratee, keysIn);
 }
 
 module.exports = baseForIn;

_baseForOwn.js

@@ -1,9 +1,8 @@
-var baseFor = require('./baseFor'),
-    keys = require('../object/keys');
+var baseFor = require('./_baseFor'),
+    keys = require('./keys');
 
 /**
- * The base implementation of `_.forOwn` without support for callback
- * shorthands and `this` binding.
+ * The base implementation of `_.forOwn` without support for iteratee shorthands.
  *
  * @private
  * @param {Object} object The object to iterate over.
@@ -11,7 +10,7 @@ var baseFor = require('./baseFor'),
  * @returns {Object} Returns `object`.
  */
 function baseForOwn(object, iteratee) {
-  return baseFor(object, iteratee, keys);
+  return object && baseFor(object, iteratee, keys);
 }
 
 module.exports = baseForOwn;

_baseForOwnRight.js

@@ -1,9 +1,8 @@
-var baseForRight = require('./baseForRight'),
-    keys = require('../object/keys');
+var baseForRight = require('./_baseForRight'),
+    keys = require('./keys');
 
 /**
- * The base implementation of `_.forOwnRight` without support for callback
- * shorthands and `this` binding.
+ * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
  *
  * @private
  * @param {Object} object The object to iterate over.
@@ -11,7 +10,7 @@ var baseForRight = require('./baseForRight'),
  * @returns {Object} Returns `object`.
  */
 function baseForOwnRight(object, iteratee) {
-  return baseForRight(object, iteratee, keys);
+  return object && baseForRight(object, iteratee, keys);
 }
 
 module.exports = baseForOwnRight;

_baseForRight.js

@@ -1,4 +1,4 @@
-var createBaseFor = require('./createBaseFor');
+var createBaseFor = require('./_createBaseFor');
 
 /**
  * This function is like `baseFor` except that it iterates over properties

_baseFunctions.js

@@ -0,0 +1,19 @@
+var arrayFilter = require('./_arrayFilter'),
+    isFunction = require('./isFunction');
+
+/**
+ * The base implementation of `_.functions` which creates an array of
+ * `object` function property names filtered from `props`.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Array} props The property names to filter.
+ * @returns {Array} Returns the new array of filtered property names.
+ */
+function baseFunctions(object, props) {
+  return arrayFilter(props, function(key) {
+    return isFunction(object[key]);
+  });
+}
+
+module.exports = baseFunctions;

_baseGet.js

@@ -0,0 +1,24 @@
+var baseCastPath = require('./_baseCastPath'),
+    isKey = require('./_isKey');
+
+/**
+ * The base implementation of `_.get` without support for default values.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to get.
+ * @returns {*} Returns the resolved value.
+ */
+function baseGet(object, path) {
+  path = isKey(path, object) ? [path + ''] : baseCastPath(path);
+
+  var index = 0,
+      length = path.length;
+
+  while (object != null && index < length) {
+    object = object[path[index++]];
+  }
+  return (index && index == length) ? object : undefined;
+}
+
+module.exports = baseGet;

_baseHas.js

@@ -0,0 +1,26 @@
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/** Built-in value references. */
+var getPrototypeOf = Object.getPrototypeOf;
+
+/**
+ * The base implementation of `_.has` without support for deep paths.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} key The key to check.
+ * @returns {boolean} Returns `true` if `key` exists, else `false`.
+ */
+function baseHas(object, key) {
+  // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
+  // that are composed entirely of index properties, return `false` for
+  // `hasOwnProperty` checks of them.
+  return hasOwnProperty.call(object, key) ||
+    (typeof object == 'object' && key in object && getPrototypeOf(object) === null);
+}
+
+module.exports = baseHas;

_baseHasIn.js

@@ -0,0 +1,13 @@
+/**
+ * The base implementation of `_.hasIn` without support for deep paths.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} key The key to check.
+ * @returns {boolean} Returns `true` if `key` exists, else `false`.
+ */
+function baseHasIn(object, key) {
+  return key in Object(object);
+}
+
+module.exports = baseHasIn;

_baseInRange.js

@@ -0,0 +1,18 @@
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max,
+    nativeMin = Math.min;
+
+/**
+ * The base implementation of `_.inRange` which doesn't coerce arguments to numbers.
+ *
+ * @private
+ * @param {number} number The number to check.
+ * @param {number} start The start of the range.
+ * @param {number} end The end of the range.
+ * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
+ */
+function baseInRange(number, start, end) {
+  return number >= nativeMin(start, end) && number < nativeMax(start, end);
+}
+
+module.exports = baseInRange;

_baseIndexOf.js

@@ -1,7 +1,7 @@
-var indexOfNaN = require('./indexOfNaN');
+var indexOfNaN = require('./_indexOfNaN');
 
 /**
- * The base implementation of `_.indexOf` without support for binary searches.
+ * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
  *
  * @private
  * @param {Array} array The array to search.

_baseIndexOfWith.js

@@ -0,0 +1,23 @@
+/**
+ * This function is like `baseIndexOf` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseIndexOfWith(array, value, fromIndex, comparator) {
+  var index = fromIndex - 1,
+      length = array.length;
+
+  while (++index < length) {
+    if (comparator(array[index], value)) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+module.exports = baseIndexOfWith;

_baseIntersection.js

@@ -0,0 +1,73 @@
+var SetCache = require('./_SetCache'),
+    arrayIncludes = require('./_arrayIncludes'),
+    arrayIncludesWith = require('./_arrayIncludesWith'),
+    arrayMap = require('./_arrayMap'),
+    baseUnary = require('./_baseUnary'),
+    cacheHas = require('./_cacheHas');
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min;
+
+/**
+ * The base implementation of methods like `_.intersection`, without support
+ * for iteratee shorthands, that accepts an array of arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of shared values.
+ */
+function baseIntersection(arrays, iteratee, comparator) {
+  var includes = comparator ? arrayIncludesWith : arrayIncludes,
+      length = arrays[0].length,
+      othLength = arrays.length,
+      othIndex = othLength,
+      caches = Array(othLength),
+      maxLength = Infinity,
+      result = [];
+
+  while (othIndex--) {
+    var array = arrays[othIndex];
+    if (othIndex && iteratee) {
+      array = arrayMap(array, baseUnary(iteratee));
+    }
+    maxLength = nativeMin(array.length, maxLength);
+    caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
+      ? new SetCache(othIndex && array)
+      : undefined;
+  }
+  array = arrays[0];
+
+  var index = -1,
+      seen = caches[0];
+
+  outer:
+  while (++index < length && result.length < maxLength) {
+    var value = array[index],
+        computed = iteratee ? iteratee(value) : value;
+
+    if (!(seen
+          ? cacheHas(seen, computed)
+          : includes(result, computed, comparator)
+        )) {
+      othIndex = othLength;
+      while (--othIndex) {
+        var cache = caches[othIndex];
+        if (!(cache
+              ? cacheHas(cache, computed)
+              : includes(arrays[othIndex], computed, comparator))
+            ) {
+          continue outer;
+        }
+      }
+      if (seen) {
+        seen.push(computed);
+      }
+      result.push(value);
+    }
+  }
+  return result;
+}
+
+module.exports = baseIntersection;

_baseInverter.js

@@ -0,0 +1,21 @@
+var baseForOwn = require('./_baseForOwn');
+
+/**
+ * The base implementation of `_.invert` and `_.invertBy` which inverts
+ * `object` with values transformed by `iteratee` and set by `setter`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} setter The function to set `accumulator` values.
+ * @param {Function} iteratee The iteratee to transform values.
+ * @param {Object} accumulator The initial inverted object.
+ * @returns {Function} Returns `accumulator`.
+ */
+function baseInverter(object, setter, iteratee, accumulator) {
+  baseForOwn(object, function(value, key, object) {
+    setter(accumulator, iteratee(value), key, object);
+  });
+  return accumulator;
+}
+
+module.exports = baseInverter;

_baseInvoke.js

@@ -0,0 +1,27 @@
+var apply = require('./_apply'),
+    baseCastPath = require('./_baseCastPath'),
+    isKey = require('./_isKey'),
+    last = require('./last'),
+    parent = require('./_parent');
+
+/**
+ * The base implementation of `_.invoke` without support for individual
+ * method arguments.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the method to invoke.
+ * @param {Array} args The arguments to invoke the method with.
+ * @returns {*} Returns the result of the invoked method.
+ */
+function baseInvoke(object, path, args) {
+  if (!isKey(path, object)) {
+    path = baseCastPath(path);
+    object = parent(object, path);
+    path = last(path);
+  }
+  var func = object == null ? object : object[path];
+  return func == null ? undefined : apply(func, object, args);
+}
+
+module.exports = baseInvoke;

_baseIsEqual.js

@@ -1,28 +1,30 @@
-var baseIsEqualDeep = require('./baseIsEqualDeep'),
-    isObject = require('../lang/isObject'),
+var baseIsEqualDeep = require('./_baseIsEqualDeep'),
+    isObject = require('./isObject'),
     isObjectLike = require('./isObjectLike');
 
 /**
- * The base implementation of `_.isEqual` without support for `this` binding
- * `customizer` functions.
+ * The base implementation of `_.isEqual` which supports partial comparisons
+ * and tracks traversed objects.
  *
  * @private
  * @param {*} value The value to compare.
  * @param {*} other The other value to compare.
- * @param {Function} [customizer] The function to customize comparing values.
- * @param {boolean} [isLoose] Specify performing partial comparisons.
- * @param {Array} [stackA] Tracks traversed `value` objects.
- * @param {Array} [stackB] Tracks traversed `other` objects.
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @param {boolean} [bitmask] The bitmask of comparison flags.
+ *  The bitmask may be composed of the following flags:
+ *     1 - Unordered comparison
+ *     2 - Partial comparison
+ * @param {Object} [stack] Tracks traversed `value` and `other` objects.
  * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
  */
-function baseIsEqual(value, other, customizer, isLoose, stackA, stackB) {
+function baseIsEqual(value, other, customizer, bitmask, stack) {
   if (value === other) {
     return true;
   }
   if (value == null || other == null || (!isObject(value) && !isObjectLike(other))) {
     return value !== value && other !== other;
   }
-  return baseIsEqualDeep(value, other, baseIsEqual, customizer, isLoose, stackA, stackB);
+  return baseIsEqualDeep(value, other, baseIsEqual, customizer, bitmask, stack);
 }
 
 module.exports = baseIsEqual;

_baseIsEqualDeep.js

@@ -0,0 +1,78 @@
+var Stack = require('./_Stack'),
+    equalArrays = require('./_equalArrays'),
+    equalByTag = require('./_equalByTag'),
+    equalObjects = require('./_equalObjects'),
+    getTag = require('./_getTag'),
+    isArray = require('./isArray'),
+    isHostObject = require('./_isHostObject'),
+    isTypedArray = require('./isTypedArray');
+
+/** Used to compose bitmasks for comparison styles. */
+var PARTIAL_COMPARE_FLAG = 2;
+
+/** `Object#toString` result references. */
+var argsTag = '[object Arguments]',
+    arrayTag = '[object Array]',
+    objectTag = '[object Object]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * A specialized version of `baseIsEqual` for arrays and objects which performs
+ * deep comparisons and tracks traversed objects enabling objects with circular
+ * references to be compared.
+ *
+ * @private
+ * @param {Object} object The object to compare.
+ * @param {Object} other The other object to compare.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual` for more details.
+ * @param {Object} [stack] Tracks traversed `object` and `other` objects.
+ * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ */
+function baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) {
+  var objIsArr = isArray(object),
+      othIsArr = isArray(other),
+      objTag = arrayTag,
+      othTag = arrayTag;
+
+  if (!objIsArr) {
+    objTag = getTag(object);
+    objTag = objTag == argsTag ? objectTag : objTag;
+  }
+  if (!othIsArr) {
+    othTag = getTag(other);
+    othTag = othTag == argsTag ? objectTag : othTag;
+  }
+  var objIsObj = objTag == objectTag && !isHostObject(object),
+      othIsObj = othTag == objectTag && !isHostObject(other),
+      isSameTag = objTag == othTag;
+
+  if (isSameTag && !objIsObj) {
+    stack || (stack = new Stack);
+    return (objIsArr || isTypedArray(object))
+      ? equalArrays(object, other, equalFunc, customizer, bitmask, stack)
+      : equalByTag(object, other, objTag, equalFunc, customizer, bitmask, stack);
+  }
+  if (!(bitmask & PARTIAL_COMPARE_FLAG)) {
+    var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
+        othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
+
+    if (objIsWrapped || othIsWrapped) {
+      stack || (stack = new Stack);
+      return equalFunc(objIsWrapped ? object.value() : object, othIsWrapped ? other.value() : other, customizer, bitmask, stack);
+    }
+  }
+  if (!isSameTag) {
+    return false;
+  }
+  stack || (stack = new Stack);
+  return equalObjects(object, other, equalFunc, customizer, bitmask, stack);
+}
+
+module.exports = baseIsEqualDeep;

_baseIsMatch.js

@@ -1,17 +1,21 @@
-var baseIsEqual = require('./baseIsEqual'),
-    toObject = require('./toObject');
+var Stack = require('./_Stack'),
+    baseIsEqual = require('./_baseIsEqual');
+
+/** Used to compose bitmasks for comparison styles. */
+var UNORDERED_COMPARE_FLAG = 1,
+    PARTIAL_COMPARE_FLAG = 2;
 
 /**
- * The base implementation of `_.isMatch` without support for callback
- * shorthands and `this` binding.
+ * The base implementation of `_.isMatch` without support for iteratee shorthands.
  *
  * @private
  * @param {Object} object The object to inspect.
- * @param {Array} matchData The propery names, values, and compare flags to match.
- * @param {Function} [customizer] The function to customize comparing objects.
+ * @param {Object} source The object of property values to match.
+ * @param {Array} matchData The property names, values, and compare flags to match.
+ * @param {Function} [customizer] The function to customize comparisons.
  * @returns {boolean} Returns `true` if `object` is a match, else `false`.
  */
-function baseIsMatch(object, matchData, customizer) {
+function baseIsMatch(object, source, matchData, customizer) {
   var index = matchData.length,
       length = index,
       noCustomizer = !customizer;
@@ -19,7 +23,7 @@ function baseIsMatch(object, matchData, customizer) {
   if (object == null) {
     return !length;
   }
-  object = toObject(object);
+  object = Object(object);
   while (index--) {
     var data = matchData[index];
     if ((noCustomizer && data[2])
@@ -40,8 +44,13 @@ function baseIsMatch(object, matchData, customizer) {
         return false;
       }
     } else {
-      var result = customizer ? customizer(objValue, srcValue, key) : undefined;
-      if (!(result === undefined ? baseIsEqual(srcValue, objValue, customizer, true) : result)) {
+      var stack = new Stack,
+          result = customizer ? customizer(objValue, srcValue, key, object, source, stack) : undefined;
+
+      if (!(result === undefined
+            ? baseIsEqual(srcValue, objValue, customizer, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG, stack)
+            : result
+          )) {
         return false;
       }
     }

_baseIteratee.js

@@ -0,0 +1,30 @@
+var baseMatches = require('./_baseMatches'),
+    baseMatchesProperty = require('./_baseMatchesProperty'),
+    identity = require('./identity'),
+    isArray = require('./isArray'),
+    property = require('./property');
+
+/**
+ * The base implementation of `_.iteratee`.
+ *
+ * @private
+ * @param {*} [value=_.identity] The value to convert to an iteratee.
+ * @returns {Function} Returns the iteratee.
+ */
+function baseIteratee(value) {
+  var type = typeof value;
+  if (type == 'function') {
+    return value;
+  }
+  if (value == null) {
+    return identity;
+  }
+  if (type == 'object') {
+    return isArray(value)
+      ? baseMatchesProperty(value[0], value[1])
+      : baseMatches(value);
+  }
+  return property(value);
+}
+
+module.exports = baseIteratee;

_baseKeys.js

@@ -0,0 +1,16 @@
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeKeys = Object.keys;
+
+/**
+ * The base implementation of `_.keys` which doesn't skip the constructor
+ * property of prototypes or treat sparse arrays as dense.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+function baseKeys(object) {
+  return nativeKeys(Object(object));
+}
+
+module.exports = baseKeys;

_baseKeysIn.js

@@ -0,0 +1,36 @@
+var Reflect = require('./_Reflect'),
+    iteratorToArray = require('./_iteratorToArray');
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Built-in value references. */
+var enumerate = Reflect ? Reflect.enumerate : undefined,
+    propertyIsEnumerable = objectProto.propertyIsEnumerable;
+
+/**
+ * The base implementation of `_.keysIn` which doesn't skip the constructor
+ * property of prototypes or treat sparse arrays as dense.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+function baseKeysIn(object) {
+  object = object == null ? object : Object(object);
+
+  var result = [];
+  for (var key in object) {
+    result.push(key);
+  }
+  return result;
+}
+
+// Fallback for IE < 9 with es6-shim.
+if (enumerate && !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf')) {
+  baseKeysIn = function(object) {
+    return iteratorToArray(enumerate(object));
+  };
+}
+
+module.exports = baseKeysIn;

_baseMap.js

@@ -1,12 +1,11 @@
-var baseEach = require('./baseEach'),
+var baseEach = require('./_baseEach'),
     isArrayLike = require('./isArrayLike');
 
 /**
- * The base implementation of `_.map` without support for callback shorthands
- * and `this` binding.
+ * The base implementation of `_.map` without support for iteratee shorthands.
  *
  * @private
- * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {Array|Object} collection The collection to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns the new mapped array.
  */

_baseMatches.js

@@ -1,9 +1,8 @@
-var baseIsMatch = require('./baseIsMatch'),
-    getMatchData = require('./getMatchData'),
-    toObject = require('./toObject');
+var baseIsMatch = require('./_baseIsMatch'),
+    getMatchData = require('./_getMatchData');
 
 /**
- * The base implementation of `_.matches` which does not clone `source`.
+ * The base implementation of `_.matches` which doesn't clone `source`.
  *
  * @private
  * @param {Object} source The object of property values to match.
@@ -19,11 +18,12 @@ function baseMatches(source) {
       if (object == null) {
         return false;
       }
-      return object[key] === value && (value !== undefined || (key in toObject(object)));
+      return object[key] === value &&
+        (value !== undefined || (key in Object(object)));
     };
   }
   return function(object) {
-    return baseIsMatch(object, matchData);
+    return object === source || baseIsMatch(object, source, matchData);
   };
 }
 

_baseMatchesProperty.js

@@ -0,0 +1,26 @@
+var baseIsEqual = require('./_baseIsEqual'),
+    get = require('./get'),
+    hasIn = require('./hasIn');
+
+/** Used to compose bitmasks for comparison styles. */
+var UNORDERED_COMPARE_FLAG = 1,
+    PARTIAL_COMPARE_FLAG = 2;
+
+/**
+ * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
+ *
+ * @private
+ * @param {string} path The path of the property to get.
+ * @param {*} srcValue The value to match.
+ * @returns {Function} Returns the new function.
+ */
+function baseMatchesProperty(path, srcValue) {
+  return function(object) {
+    var objValue = get(object, path);
+    return (objValue === undefined && objValue === srcValue)
+      ? hasIn(object, path)
+      : baseIsEqual(srcValue, objValue, undefined, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG);
+  };
+}
+
+module.exports = baseMatchesProperty;

_baseMerge.js

@@ -0,0 +1,50 @@
+var Stack = require('./_Stack'),
+    arrayEach = require('./_arrayEach'),
+    assignMergeValue = require('./_assignMergeValue'),
+    baseMergeDeep = require('./_baseMergeDeep'),
+    isArray = require('./isArray'),
+    isObject = require('./isObject'),
+    isTypedArray = require('./isTypedArray'),
+    keysIn = require('./keysIn');
+
+/**
+ * The base implementation of `_.merge` without support for multiple sources.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {number} srcIndex The index of `source`.
+ * @param {Function} [customizer] The function to customize merged values.
+ * @param {Object} [stack] Tracks traversed source values and their merged counterparts.
+ */
+function baseMerge(object, source, srcIndex, customizer, stack) {
+  if (object === source) {
+    return;
+  }
+  var props = (isArray(source) || isTypedArray(source))
+    ? undefined
+    : keysIn(source);
+
+  arrayEach(props || source, function(srcValue, key) {
+    if (props) {
+      key = srcValue;
+      srcValue = source[key];
+    }
+    if (isObject(srcValue)) {
+      stack || (stack = new Stack);
+      baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
+    }
+    else {
+      var newValue = customizer
+        ? customizer(object[key], srcValue, (key + ''), object, source, stack)
+        : undefined;
+
+      if (newValue === undefined) {
+        newValue = srcValue;
+      }
+      assignMergeValue(object, key, newValue);
+    }
+  });
+}
+
+module.exports = baseMerge;

_baseMergeDeep.js

@@ -0,0 +1,82 @@
+var assignMergeValue = require('./_assignMergeValue'),
+    baseClone = require('./_baseClone'),
+    copyArray = require('./_copyArray'),
+    isArguments = require('./isArguments'),
+    isArray = require('./isArray'),
+    isArrayLikeObject = require('./isArrayLikeObject'),
+    isFunction = require('./isFunction'),
+    isObject = require('./isObject'),
+    isPlainObject = require('./isPlainObject'),
+    isTypedArray = require('./isTypedArray'),
+    toPlainObject = require('./toPlainObject');
+
+/**
+ * A specialized version of `baseMerge` for arrays and objects which performs
+ * deep merges and tracks traversed objects enabling objects with circular
+ * references to be merged.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @param {string} key The key of the value to merge.
+ * @param {number} srcIndex The index of `source`.
+ * @param {Function} mergeFunc The function to merge values.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @param {Object} [stack] Tracks traversed source values and their merged counterparts.
+ */
+function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
+  var objValue = object[key],
+      srcValue = source[key],
+      stacked = stack.get(srcValue);
+
+  if (stacked) {
+    assignMergeValue(object, key, stacked);
+    return;
+  }
+  var newValue = customizer
+    ? customizer(objValue, srcValue, (key + ''), object, source, stack)
+    : undefined;
+
+  var isCommon = newValue === undefined;
+
+  if (isCommon) {
+    newValue = srcValue;
+    if (isArray(srcValue) || isTypedArray(srcValue)) {
+      if (isArray(objValue)) {
+        newValue = objValue;
+      }
+      else if (isArrayLikeObject(objValue)) {
+        newValue = copyArray(objValue);
+      }
+      else {
+        isCommon = false;
+        newValue = baseClone(srcValue, !customizer);
+      }
+    }
+    else if (isPlainObject(srcValue) || isArguments(srcValue)) {
+      if (isArguments(objValue)) {
+        newValue = toPlainObject(objValue);
+      }
+      else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
+        isCommon = false;
+        newValue = baseClone(srcValue, !customizer);
+      }
+      else {
+        newValue = objValue;
+      }
+    }
+    else {
+      isCommon = false;
+    }
+  }
+  stack.set(srcValue, newValue);
+
+  if (isCommon) {
+    // Recursively merge objects and arrays (susceptible to call stack limits).
+    mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
+  }
+  stack['delete'](srcValue);
+  assignMergeValue(object, key, newValue);
+}
+
+module.exports = baseMergeDeep;

_baseOrderBy.js

@@ -0,0 +1,32 @@
+var arrayMap = require('./_arrayMap'),
+    baseIteratee = require('./_baseIteratee'),
+    baseMap = require('./_baseMap'),
+    baseSortBy = require('./_baseSortBy'),
+    compareMultiple = require('./_compareMultiple');
+
+/**
+ * The base implementation of `_.orderBy` without param guards.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
+ * @param {string[]} orders The sort orders of `iteratees`.
+ * @returns {Array} Returns the new sorted array.
+ */
+function baseOrderBy(collection, iteratees, orders) {
+  var index = -1;
+  iteratees = arrayMap(iteratees.length ? iteratees : Array(1), baseIteratee);
+
+  var result = baseMap(collection, function(value, key, collection) {
+    var criteria = arrayMap(iteratees, function(iteratee) {
+      return iteratee(value);
+    });
+    return { 'criteria': criteria, 'index': ++index, 'value': value };
+  });
+
+  return baseSortBy(result, function(object, other) {
+    return compareMultiple(object, other, orders);
+  });
+}
+
+module.exports = baseOrderBy;

_basePick.js

@@ -0,0 +1,22 @@
+var arrayReduce = require('./_arrayReduce');
+
+/**
+ * The base implementation of `_.pick` without support for individual
+ * property names.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {string[]} props The property names to pick.
+ * @returns {Object} Returns the new object.
+ */
+function basePick(object, props) {
+  object = Object(object);
+  return arrayReduce(props, function(result, key) {
+    if (key in object) {
+      result[key] = object[key];
+    }
+    return result;
+  }, {});
+}
+
+module.exports = basePick;

_basePickBy.js

@@ -0,0 +1,21 @@
+var baseForIn = require('./_baseForIn');
+
+/**
+ * The base implementation of  `_.pickBy` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The source object.
+ * @param {Function} predicate The function invoked per property.
+ * @returns {Object} Returns the new object.
+ */
+function basePickBy(object, predicate) {
+  var result = {};
+  baseForIn(object, function(value, key) {
+    if (predicate(value, key)) {
+      result[key] = value;
+    }
+  });
+  return result;
+}
+
+module.exports = basePickBy;

_basePropertyDeep.js

@@ -1,5 +1,4 @@
-var baseGet = require('./baseGet'),
-    toPath = require('./toPath');
+var baseGet = require('./_baseGet');
 
 /**
  * A specialized version of `baseProperty` which supports deep paths.
@@ -9,10 +8,8 @@ var baseGet = require('./baseGet'),
  * @returns {Function} Returns the new function.
  */
 function basePropertyDeep(path) {
-  var pathKey = (path + '');
-  path = toPath(path);
   return function(object) {
-    return baseGet(object, path, pathKey);
+    return baseGet(object, path);
   };
 }
 

_basePullAll.js

@@ -0,0 +1,47 @@
+var arrayMap = require('./_arrayMap'),
+    baseIndexOf = require('./_baseIndexOf'),
+    baseIndexOfWith = require('./_baseIndexOfWith'),
+    baseUnary = require('./_baseUnary');
+
+/** Used for built-in method references. */
+var arrayProto = Array.prototype;
+
+/** Built-in value references. */
+var splice = arrayProto.splice;
+
+/**
+ * The base implementation of `_.pullAllBy` without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns `array`.
+ */
+function basePullAll(array, values, iteratee, comparator) {
+  var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
+      index = -1,
+      length = values.length,
+      seen = array;
+
+  if (iteratee) {
+    seen = arrayMap(array, baseUnary(iteratee));
+  }
+  while (++index < length) {
+    var fromIndex = 0,
+        value = values[index],
+        computed = iteratee ? iteratee(value) : value;
+
+    while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
+      if (seen !== array) {
+        splice.call(seen, fromIndex, 1);
+      }
+      splice.call(array, fromIndex, 1);
+    }
+  }
+  return array;
+}
+
+module.exports = basePullAll;

_basePullAt.js

@@ -0,0 +1,49 @@
+var baseCastPath = require('./_baseCastPath'),
+    isIndex = require('./_isIndex'),
+    isKey = require('./_isKey'),
+    last = require('./last'),
+    parent = require('./_parent');
+
+/** Used for built-in method references. */
+var arrayProto = Array.prototype;
+
+/** Built-in value references. */
+var splice = arrayProto.splice;
+
+/**
+ * The base implementation of `_.pullAt` without support for individual
+ * indexes or capturing the removed elements.
+ *
+ * @private
+ * @param {Array} array The array to modify.
+ * @param {number[]} indexes The indexes of elements to remove.
+ * @returns {Array} Returns `array`.
+ */
+function basePullAt(array, indexes) {
+  var length = array ? indexes.length : 0,
+      lastIndex = length - 1;
+
+  while (length--) {
+    var index = indexes[length];
+    if (lastIndex == length || index != previous) {
+      var previous = index;
+      if (isIndex(index)) {
+        splice.call(array, index, 1);
+      }
+      else if (!isKey(index, array)) {
+        var path = baseCastPath(index),
+            object = parent(array, path);
+
+        if (object != null) {
+          delete object[last(path)];
+        }
+      }
+      else {
+        delete array[index];
+      }
+    }
+  }
+  return array;
+}
+
+module.exports = basePullAt;

_baseRandom.js

@@ -0,0 +1,18 @@
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeFloor = Math.floor,
+    nativeRandom = Math.random;
+
+/**
+ * The base implementation of `_.random` without support for returning
+ * floating-point numbers.
+ *
+ * @private
+ * @param {number} lower The lower bound.
+ * @param {number} upper The upper bound.
+ * @returns {number} Returns the random number.
+ */
+function baseRandom(lower, upper) {
+  return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
+}
+
+module.exports = baseRandom;

_baseRange.js

@@ -0,0 +1,28 @@
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeCeil = Math.ceil,
+    nativeMax = Math.max;
+
+/**
+ * The base implementation of `_.range` and `_.rangeRight` which doesn't
+ * coerce arguments to numbers.
+ *
+ * @private
+ * @param {number} start The start of the range.
+ * @param {number} end The end of the range.
+ * @param {number} step The value to increment or decrement by.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Array} Returns the new array of numbers.
+ */
+function baseRange(start, end, step, fromRight) {
+  var index = -1,
+      length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
+      result = Array(length);
+
+  while (length--) {
+    result[fromRight ? length : ++index] = start;
+    start += step;
+  }
+  return result;
+}
+
+module.exports = baseRange;

_baseReduce.js

@@ -0,0 +1,22 @@
+/**
+ * The base implementation of `_.reduce` and `_.reduceRight`, without support
+ * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} accumulator The initial value.
+ * @param {boolean} initAccum Specify using the first or last element of `collection` as the initial value.
+ * @param {Function} eachFunc The function to iterate over `collection`.
+ * @returns {*} Returns the accumulated value.
+ */
+function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
+  eachFunc(collection, function(value, index, collection) {
+    accumulator = initAccum
+      ? (initAccum = false, value)
+      : iteratee(accumulator, value, index, collection);
+  });
+  return accumulator;
+}
+
+module.exports = baseReduce;

_baseSet.js

@@ -0,0 +1,45 @@
+var assignValue = require('./_assignValue'),
+    baseCastPath = require('./_baseCastPath'),
+    isIndex = require('./_isIndex'),
+    isKey = require('./_isKey'),
+    isObject = require('./isObject');
+
+/**
+ * The base implementation of `_.set`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to set.
+ * @param {*} value The value to set.
+ * @param {Function} [customizer] The function to customize path creation.
+ * @returns {Object} Returns `object`.
+ */
+function baseSet(object, path, value, customizer) {
+  path = isKey(path, object) ? [path + ''] : baseCastPath(path);
+
+  var index = -1,
+      length = path.length,
+      lastIndex = length - 1,
+      nested = object;
+
+  while (nested != null && ++index < length) {
+    var key = path[index];
+    if (isObject(nested)) {
+      var newValue = value;
+      if (index != lastIndex) {
+        var objValue = nested[key];
+        newValue = customizer ? customizer(objValue, key, nested) : undefined;
+        if (newValue === undefined) {
+          newValue = objValue == null
+            ? (isIndex(path[index + 1]) ? [] : {})
+            : objValue;
+        }
+      }
+      assignValue(nested, key, newValue);
+    }
+    nested = nested[key];
+  }
+  return object;
+}
+
+module.exports = baseSet;

_baseSetData.js

@@ -1,5 +1,5 @@
-var identity = require('../utility/identity'),
-    metaMap = require('./metaMap');
+var identity = require('./identity'),
+    metaMap = require('./_metaMap');
 
 /**
  * The base implementation of `setData` without support for hot loop detection.

_baseSlice.js

@@ -11,11 +11,10 @@ function baseSlice(array, start, end) {
   var index = -1,
       length = array.length;
 
-  start = start == null ? 0 : (+start || 0);
   if (start < 0) {
     start = -start > length ? 0 : (length + start);
   }
-  end = (end === undefined || end > length) ? length : (+end || 0);
+  end = end > length ? length : end;
   if (end < 0) {
     end += length;
   }