Bump to v4.13.0.

README.md

@@ -1,4 +1,4 @@
-# lodash v4.11.2
+# lodash v4.13.0
 
 The [Lodash](https://lodash.com/) library exported as [Node.js](https://nodejs.org/) modules.
 
@@ -28,13 +28,13 @@ var chunk = require('lodash/chunk');
 var extend = require('lodash/fp/extend');
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.11.2-npm) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.13.0-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>
+Don’t assign values to the [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` in the Node.js < 6 REPL.<br>
 Install [n_](https://www.npmjs.com/package/n_) for a REPL that includes `lodash` by default.
 
 ## Support
 
-Tested in Chrome 48-49, Firefox 44-45, IE 9-11, Edge 13, Safari 8-9, Node.js 0.10, 0.12, 4, & 5, & PhantomJS 1.9.8.<br>
+Tested in Chrome 49-50, Firefox 45-46, IE 9-11, Edge 13, Safari 8-9, Node.js 0.10-6, & 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

@@ -1,18 +1,32 @@
-var nativeCreate = require('./_nativeCreate');
+var hashClear = require('./_hashClear'),
-
+    hashDelete = require('./_hashDelete'),
-/** Used for built-in method references. */
+    hashGet = require('./_hashGet'),
-var objectProto = Object.prototype;
+    hashHas = require('./_hashHas'),
+    hashSet = require('./_hashSet');
 
 /**
  * Creates a hash object.
  *
  * @private
  * @constructor
- * @returns {Object} Returns the new hash object.
+ * @param {Array} [entries] The key-value pairs to cache.
  */
-function Hash() {}
+function Hash(entries) {
+  var index = -1,
+      length = entries ? entries.length : 0;
 
-// Avoid inheriting from `Object.prototype` when possible.
+  this.clear();
-Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto;
+  while (++index < length) {
+    var entry = entries[index];
+    this.set(entry[0], entry[1]);
+  }
+}
+
+// Add methods to `Hash`.
+Hash.prototype.clear = hashClear;
+Hash.prototype['delete'] = hashDelete;
+Hash.prototype.get = hashGet;
+Hash.prototype.has = hashHas;
+Hash.prototype.set = hashSet;
 
 module.exports = Hash;

_ListCache.js

@@ -0,0 +1,32 @@
+var listCacheClear = require('./_listCacheClear'),
+    listCacheDelete = require('./_listCacheDelete'),
+    listCacheGet = require('./_listCacheGet'),
+    listCacheHas = require('./_listCacheHas'),
+    listCacheSet = require('./_listCacheSet');
+
+/**
+ * Creates an list cache object.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+function ListCache(entries) {
+  var index = -1,
+      length = entries ? entries.length : 0;
+
+  this.clear();
+  while (++index < length) {
+    var entry = entries[index];
+    this.set(entry[0], entry[1]);
+  }
+}
+
+// Add methods to `ListCache`.
+ListCache.prototype.clear = listCacheClear;
+ListCache.prototype['delete'] = listCacheDelete;
+ListCache.prototype.get = listCacheGet;
+ListCache.prototype.has = listCacheHas;
+ListCache.prototype.set = listCacheSet;
+
+module.exports = ListCache;

_MapCache.js

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

_SetCache.js

@@ -1,9 +1,10 @@
 var MapCache = require('./_MapCache'),
-    cachePush = require('./_cachePush');
+    setCacheAdd = require('./_setCacheAdd'),
+    setCacheHas = require('./_setCacheHas');
 
 /**
  *
- * Creates a set cache object to store unique values.
+ * Creates an array cache object to store unique values.
  *
  * @private
  * @constructor
@@ -15,11 +16,12 @@ function SetCache(values) {
 
   this.__data__ = new MapCache;
   while (++index < length) {
-    this.push(values[index]);
+    this.add(values[index]);
   }
 }
 
 // Add methods to `SetCache`.
-SetCache.prototype.push = cachePush;
+SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
+SetCache.prototype.has = setCacheHas;
 
 module.exports = SetCache;

_Stack.js

@@ -1,4 +1,5 @@
-var stackClear = require('./_stackClear'),
+var ListCache = require('./_ListCache'),
+    stackClear = require('./_stackClear'),
     stackDelete = require('./_stackDelete'),
     stackGet = require('./_stackGet'),
     stackHas = require('./_stackHas'),
@@ -9,17 +10,10 @@ var stackClear = require('./_stackClear'),
  *
  * @private
  * @constructor
- * @param {Array} [values] The values to cache.
+ * @param {Array} [entries] The key-value pairs to cache.
  */
-function Stack(values) {
+function Stack(entries) {
-  var index = -1,
+  this.__data__ = new ListCache(entries);
-      length = values ? values.length : 0;
-
-  this.clear();
-  while (++index < length) {
-    var entry = values[index];
-    this.set(entry[0], entry[1]);
-  }
 }
 
 // Add methods to `Stack`.

_arrayAggregator.js

@@ -2,7 +2,7 @@
  * A specialized version of `baseAggregator` for arrays.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @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.
@@ -10,7 +10,7 @@
  */
 function arrayAggregator(array, setter, iteratee, accumulator) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     var value = array[index];

_arrayConcat.js

@@ -1,25 +0,0 @@
-/**
- * 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

@@ -3,13 +3,13 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns `array`.
  */
 function arrayEach(array, iteratee) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (iteratee(array[index], index, array) === false) {

_arrayEachRight.js

@@ -3,12 +3,12 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns `array`.
  */
 function arrayEachRight(array, iteratee) {
-  var length = array.length;
+  var length = array ? array.length : 0;
 
   while (length--) {
     if (iteratee(array[length], length, array) === false) {

_arrayEvery.js

@@ -3,14 +3,14 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @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`.
  */
 function arrayEvery(array, predicate) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (!predicate(array[index], index, array)) {

_arrayFilter.js

@@ -3,13 +3,13 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} predicate The function invoked per iteration.
  * @returns {Array} Returns the new filtered array.
  */
 function arrayFilter(array, predicate) {
   var index = -1,
-      length = array.length,
+      length = array ? array.length : 0,
       resIndex = 0,
       result = [];
 

_arrayIncludes.js

@@ -5,12 +5,13 @@ var baseIndexOf = require('./_baseIndexOf');
  * specifying an index to search from.
  *
  * @private
- * @param {Array} array The array to search.
+ * @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;
+  var length = array ? array.length : 0;
+  return !!length && baseIndexOf(array, value, 0) > -1;
 }
 
 module.exports = arrayIncludes;

_arrayIncludesWith.js

@@ -2,14 +2,14 @@
  * This function is like `arrayIncludes` except that it accepts a comparator.
  *
  * @private
- * @param {Array} array The array to search.
+ * @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;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (comparator(value, array[index])) {

_arrayMap.js

@@ -3,13 +3,13 @@
  * shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns the new mapped array.
  */
 function arrayMap(array, iteratee) {
   var index = -1,
-      length = array.length,
+      length = array ? array.length : 0,
       result = Array(length);
 
   while (++index < length) {

_arrayReduce.js

@@ -3,7 +3,7 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
  * @param {boolean} [initAccum] Specify using the first element of `array` as
@@ -12,7 +12,7 @@
  */
 function arrayReduce(array, iteratee, accumulator, initAccum) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   if (initAccum && length) {
     accumulator = array[++index];

_arrayReduceRight.js

@@ -3,7 +3,7 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
  * @param {boolean} [initAccum] Specify using the last element of `array` as
@@ -11,7 +11,7 @@
  * @returns {*} Returns the accumulated value.
  */
 function arrayReduceRight(array, iteratee, accumulator, initAccum) {
-  var length = array.length;
+  var length = array ? array.length : 0;
   if (initAccum && length) {
     accumulator = array[--length];
   }

_arraySome.js

@@ -3,14 +3,14 @@
  * shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @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`.
  */
 function arraySome(array, predicate) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (predicate(array[index], index, array)) {

_assocGet.js

@@ -1,16 +0,0 @@
-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;

_assocSet.js

@@ -1,20 +0,0 @@
-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;

_baseAt.js

@@ -6,7 +6,7 @@ var get = require('./get');
  * @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.
+ * @returns {Array} Returns the picked elements.
  */
 function baseAt(object, paths) {
   var index = -1,

_baseConforms.js

@@ -5,7 +5,7 @@ var keys = require('./keys');
  *
  * @private
  * @param {Object} source The object of property predicates to conform to.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new spec function.
  */
 function baseConforms(source) {
   var props = keys(source),

_baseFindIndex.js

@@ -5,12 +5,13 @@
  * @private
  * @param {Array} array The array to search.
  * @param {Function} predicate The function invoked per iteration.
+ * @param {number} fromIndex The index to search from.
  * @param {boolean} [fromRight] Specify iterating from right to left.
  * @returns {number} Returns the index of the matched value, else `-1`.
  */
-function baseFindIndex(array, predicate, fromRight) {
+function baseFindIndex(array, predicate, fromIndex, fromRight) {
   var length = array.length,
-      index = fromRight ? length : -1;
+      index = fromIndex + (fromRight ? 1 : -1);
 
   while ((fromRight ? index-- : ++index < length)) {
     if (predicate(array[index], index, array)) {

_baseFindKey.js

@@ -1,25 +1,23 @@
 /**
- * The base implementation of methods like `_.find` and `_.findKey`, without
+ * The base implementation of methods like `_.findKey` and `_.findLastKey`,
- * support for iteratee shorthands, which iterates over `collection` using
+ * without support for iteratee shorthands, which iterates over `collection`
- * `eachFunc`.
+ * using `eachFunc`.
  *
  * @private
  * @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.
  * @returns {*} Returns the found element or its key, else `undefined`.
  */
-function baseFind(collection, predicate, eachFunc, retKey) {
+function baseFindKey(collection, predicate, eachFunc) {
   var result;
   eachFunc(collection, function(value, key, collection) {
     if (predicate(value, key, collection)) {
-      result = retKey ? key : value;
+      result = key;
       return false;
     }
   });
   return result;
 }
 
-module.exports = baseFind;
+module.exports = baseFindKey;

_baseFunctions.js

@@ -8,7 +8,7 @@ var arrayFilter = require('./_arrayFilter'),
  * @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.
+ * @returns {Array} Returns the function names.
  */
 function baseFunctions(object, props) {
   return arrayFilter(props, function(key) {

_baseGetAllKeys.js

@@ -14,9 +14,7 @@ var arrayPush = require('./_arrayPush'),
  */
 function baseGetAllKeys(object, keysFunc, symbolsFunc) {
   var result = keysFunc(object);
-  return isArray(object)
+  return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
-    ? result
-    : arrayPush(result, symbolsFunc(object));
 }
 
 module.exports = baseGetAllKeys;

_baseHas.js

@@ -10,7 +10,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * The base implementation of `_.has` without support for deep paths.
  *
  * @private
- * @param {Object} object The object to query.
+ * @param {Object} [object] The object to query.
  * @param {Array|string} key The key to check.
  * @returns {boolean} Returns `true` if `key` exists, else `false`.
  */
@@ -18,8 +18,9 @@ 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) ||
+  return object != null &&
-    (typeof object == 'object' && key in object && getPrototype(object) === null);
+    (hasOwnProperty.call(object, key) ||
+      (typeof object == 'object' && key in object && getPrototype(object) === null));
 }
 
 module.exports = baseHas;

_baseHasIn.js

@@ -2,12 +2,12 @@
  * The base implementation of `_.hasIn` without support for deep paths.
  *
  * @private
- * @param {Object} object The object to query.
+ * @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);
+  return object != null && key in Object(object);
 }
 
 module.exports = baseHasIn;

_baseIsNative.js

@@ -0,0 +1,47 @@
+var isFunction = require('./isFunction'),
+    isHostObject = require('./_isHostObject'),
+    isMasked = require('./_isMasked'),
+    isObject = require('./isObject'),
+    toSource = require('./_toSource');
+
+/**
+ * Used to match `RegExp`
+ * [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns).
+ */
+var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
+
+/** Used to detect host constructors (Safari). */
+var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to resolve the decompiled source of functions. */
+var funcToString = Function.prototype.toString;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/** Used to detect if a method is native. */
+var reIsNative = RegExp('^' +
+  funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
+  .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+);
+
+/**
+ * The base implementation of `_.isNative` without bad shim checks.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a native function,
+ *  else `false`.
+ */
+function baseIsNative(value) {
+  if (!isObject(value) || isMasked(value)) {
+    return false;
+  }
+  var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
+  return pattern.test(toSource(value));
+}
+
+module.exports = baseIsNative;

_baseMatches.js

@@ -7,7 +7,7 @@ var baseIsMatch = require('./_baseIsMatch'),
  *
  * @private
  * @param {Object} source The object of property values to match.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new spec function.
  */
 function baseMatches(source) {
   var matchData = getMatchData(source);

_baseMatchesProperty.js

@@ -16,7 +16,7 @@ var UNORDERED_COMPARE_FLAG = 1,
  * @private
  * @param {string} path The path of the property to get.
  * @param {*} srcValue The value to match.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new spec function.
  */
 function baseMatchesProperty(path, srcValue) {
   if (isKey(path) && isStrictComparable(srcValue)) {

_baseProperty.js

@@ -3,7 +3,7 @@
  *
  * @private
  * @param {string} key The key of the property to get.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new accessor function.
  */
 function baseProperty(key) {
   return function(object) {

_basePropertyDeep.js

@@ -5,7 +5,7 @@ var baseGet = require('./_baseGet');
  *
  * @private
  * @param {Array|string} path The path of the property to get.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new accessor function.
  */
 function basePropertyDeep(path) {
   return function(object) {

_basePullAll.js

@@ -1,7 +1,8 @@
 var arrayMap = require('./_arrayMap'),
     baseIndexOf = require('./_baseIndexOf'),
     baseIndexOfWith = require('./_baseIndexOfWith'),
-    baseUnary = require('./_baseUnary');
+    baseUnary = require('./_baseUnary'),
+    copyArray = require('./_copyArray');
 
 /** Used for built-in method references. */
 var arrayProto = Array.prototype;
@@ -26,6 +27,9 @@ function basePullAll(array, values, iteratee, comparator) {
       length = values.length,
       seen = array;
 
+  if (array === values) {
+    values = copyArray(values);
+  }
   if (iteratee) {
     seen = arrayMap(array, baseUnary(iteratee));
   }

_baseRange.js

@@ -11,7 +11,7 @@ var nativeCeil = Math.ceil,
  * @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.
+ * @returns {Array} Returns the range of numbers.
  */
 function baseRange(start, end, step, fromRight) {
   var index = -1,

_baseToPairs.js

@@ -7,7 +7,7 @@ var arrayMap = require('./_arrayMap');
  * @private
  * @param {Object} object The object to query.
  * @param {Array} props The property names to get values for.
- * @returns {Object} Returns the new array of key-value pairs.
+ * @returns {Object} Returns the key-value pairs.
  */
 function baseToPairs(object, props) {
   return arrayMap(props, function(key) {

_baseUnary.js

@@ -3,7 +3,7 @@
  *
  * @private
  * @param {Function} func The function to cap arguments for.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new capped function.
  */
 function baseUnary(func) {
   return function(value) {

_cacheHas.js

@@ -1,25 +1,13 @@
-var isKeyable = require('./_isKeyable');
-
-/** Used to stand-in for `undefined` hash values. */
-var HASH_UNDEFINED = '__lodash_hash_undefined__';
-
 /**
- * Checks if `value` is in `cache`.
+ * Checks if a cache value for `key` exists.
  *
  * @private
- * @param {Object} cache The set cache to search.
+ * @param {Object} cache The cache to query.
- * @param {*} value The value to search for.
+ * @param {string} key The key of the entry to check.
- * @returns {number} Returns `true` if `value` is found, else `false`.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  */
-function cacheHas(cache, value) {
+function cacheHas(cache, key) {
-  var map = cache.__data__;
+  return cache.has(key);
-  if (isKeyable(value)) {
-    var data = map.__data__,
-        hash = typeof value == 'string' ? data.string : data.hash;
-
-    return hash[value] === HASH_UNDEFINED;
-  }
-  return map.has(value);
 }
 
 module.exports = cacheHas;

_cachePush.js

@@ -1,27 +0,0 @@
-var isKeyable = require('./_isKeyable');
-
-/** Used to stand-in for `undefined` hash values. */
-var HASH_UNDEFINED = '__lodash_hash_undefined__';
-
-/**
- * Adds `value` to the set cache.
- *
- * @private
- * @name push
- * @memberOf SetCache
- * @param {*} value The value to cache.
- */
-function cachePush(value) {
-  var map = this.__data__;
-  if (isKeyable(value)) {
-    var data = map.__data__,
-        hash = typeof value == 'string' ? data.string : data.hash;
-
-    hash[value] = HASH_UNDEFINED;
-  }
-  else {
-    map.set(value, HASH_UNDEFINED);
-  }
-}
-
-module.exports = cachePush;

_composeArgs.js

@@ -6,7 +6,7 @@ var nativeMax = Math.max;
  * placeholders, and provided arguments into a single array of arguments.
  *
  * @private
- * @param {Array|Object} args The provided arguments.
+ * @param {Array} args The provided arguments.
  * @param {Array} partials The arguments to prepend to those provided.
  * @param {Array} holders The `partials` placeholder indexes.
  * @params {boolean} [isCurried] Specify composing for a curried function.

_composeArgsRight.js

@@ -6,7 +6,7 @@ var nativeMax = Math.max;
  * is tailored for `_.partialRight`.
  *
  * @private
- * @param {Array|Object} args The provided arguments.
+ * @param {Array} args The provided arguments.
  * @param {Array} partials The arguments to append to those provided.
  * @param {Array} holders The `partials` placeholder indexes.
  * @params {boolean} [isCurried] Specify composing for a curried function.

_coreJsData.js

@@ -0,0 +1,6 @@
+var root = require('./_root');
+
+/** Used to detect overreaching core-js shims. */
+var coreJsData = root['__core-js_shared__'];
+
+module.exports = coreJsData;

_createAssigner.js

@@ -15,7 +15,7 @@ function createAssigner(assigner) {
         customizer = length > 1 ? sources[length - 1] : undefined,
         guard = length > 2 ? sources[2] : undefined;
 
-    customizer = typeof customizer == 'function'
+    customizer = (assigner.length > 3 && typeof customizer == 'function')
       ? (length--, customizer)
       : undefined;
 

_createCaseFirst.js

@@ -8,7 +8,7 @@ var castSlice = require('./_castSlice'),
  *
  * @private
  * @param {string} methodName The name of the `String` case method to use.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new case function.
  */
 function createCaseFirst(methodName) {
   return function(string) {

_createCurryWrapper.js

@@ -2,7 +2,7 @@ var apply = require('./_apply'),
     createCtorWrapper = require('./_createCtorWrapper'),
     createHybridWrapper = require('./_createHybridWrapper'),
     createRecurryWrapper = require('./_createRecurryWrapper'),
-    getPlaceholder = require('./_getPlaceholder'),
+    getHolder = require('./_getHolder'),
     replaceHolders = require('./_replaceHolders'),
     root = require('./_root');
 
@@ -23,7 +23,7 @@ function createCurryWrapper(func, bitmask, arity) {
     var length = arguments.length,
         args = Array(length),
         index = length,
-        placeholder = getPlaceholder(wrapper);
+        placeholder = getHolder(wrapper);
 
     while (index--) {
       args[index] = arguments[index];

_createHybridWrapper.js

@@ -3,7 +3,7 @@ var composeArgs = require('./_composeArgs'),
     countHolders = require('./_countHolders'),
     createCtorWrapper = require('./_createCtorWrapper'),
     createRecurryWrapper = require('./_createRecurryWrapper'),
-    getPlaceholder = require('./_getPlaceholder'),
+    getHolder = require('./_getHolder'),
     reorder = require('./_reorder'),
     replaceHolders = require('./_replaceHolders'),
     root = require('./_root');
@@ -46,14 +46,14 @@ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partials
 
   function wrapper() {
     var length = arguments.length,
-        index = length,
+        args = Array(length),
-        args = Array(length);
+        index = length;
 
     while (index--) {
       args[index] = arguments[index];
     }
     if (isCurried) {
-      var placeholder = getPlaceholder(wrapper),
+      var placeholder = getHolder(wrapper),
           holdersCount = countHolders(args, placeholder);
     }
     if (partials) {

_createOver.js

@@ -12,7 +12,7 @@ var apply = require('./_apply'),
  *
  * @private
  * @param {Function} arrayFunc The function to iterate over iteratees.
- * @returns {Function} Returns the new invoker function.
+ * @returns {Function} Returns the new over function.
  */
 function createOver(arrayFunc) {
   return rest(function(iteratees) {

_createRound.js

@@ -2,6 +2,9 @@ var toInteger = require('./toInteger'),
     toNumber = require('./toNumber'),
     toString = require('./toString');
 
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min;
+
 /**
  * Creates a function like `_.round`.
  *
@@ -13,7 +16,7 @@ function createRound(methodName) {
   var func = Math[methodName];
   return function(number, precision) {
     number = toNumber(number);
-    precision = toInteger(precision);
+    precision = nativeMin(toInteger(precision), 292);
     if (precision) {
       // Shift with exponential notation to avoid floating-point issues.
       // See [MDN](https://mdn.io/round#Examples) for more details.

_createToPairs.js

@@ -0,0 +1,30 @@
+var baseToPairs = require('./_baseToPairs'),
+    getTag = require('./_getTag'),
+    mapToArray = require('./_mapToArray'),
+    setToPairs = require('./_setToPairs');
+
+/** `Object#toString` result references. */
+var mapTag = '[object Map]',
+    setTag = '[object Set]';
+
+/**
+ * Creates a `_.toPairs` or `_.toPairsIn` function.
+ *
+ * @private
+ * @param {Function} keysFunc The function to get the keys of a given object.
+ * @returns {Function} Returns the new pairs function.
+ */
+function createToPairs(keysFunc) {
+  return function(object) {
+    var tag = getTag(object);
+    if (tag == mapTag) {
+      return mapToArray(object);
+    }
+    if (tag == setTag) {
+      return setToPairs(object);
+    }
+    return baseToPairs(object, keysFunc(object));
+  };
+}
+
+module.exports = createToPairs;

_createWrapper.js

@@ -39,6 +39,7 @@ var nativeMax = Math.max;
  *    64 - `_.partialRight`
  *   128 - `_.rearg`
  *   256 - `_.ary`
+ *   512 - `_.flip`
  * @param {*} [thisArg] The `this` binding of `func`.
  * @param {Array} [partials] The arguments to be partially applied.
  * @param {Array} [holders] The `partials` placeholder indexes.

_equalArrays.js

@@ -1,4 +1,5 @@
-var arraySome = require('./_arraySome');
+var SetCache = require('./_SetCache'),
+    arraySome = require('./_arraySome');
 
 /** Used to compose bitmasks for comparison styles. */
 var UNORDERED_COMPARE_FLAG = 1,
@@ -19,9 +20,7 @@ var UNORDERED_COMPARE_FLAG = 1,
  * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
  */
 function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
-  var index = -1,
+  var isPartial = bitmask & PARTIAL_COMPARE_FLAG,
-      isPartial = bitmask & PARTIAL_COMPARE_FLAG,
-      isUnordered = bitmask & UNORDERED_COMPARE_FLAG,
       arrLength = array.length,
       othLength = other.length;
 
@@ -33,7 +32,10 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
   if (stacked) {
     return stacked == other;
   }
-  var result = true;
+  var index = -1,
+      result = true,
+      seen = (bitmask & UNORDERED_COMPARE_FLAG) ? new SetCache : undefined;
+
   stack.set(array, other);
 
   // Ignore non-index properties.
@@ -54,10 +56,12 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
       break;
     }
     // Recursively compare arrays (susceptible to call stack limits).
-    if (isUnordered) {
+    if (seen) {
-      if (!arraySome(other, function(othValue) {
+      if (!arraySome(other, function(othValue, othIndex) {
-            return arrValue === othValue ||
+            if (!seen.has(othIndex) &&
-              equalFunc(arrValue, othValue, customizer, bitmask, stack);
+                (arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
+              return seen.add(othIndex);
+            }
           })) {
         result = false;
         break;

_getHolder.js

@@ -5,9 +5,9 @@
  * @param {Function} func The function to inspect.
  * @returns {*} Returns the placeholder value.
  */
-function getPlaceholder(func) {
+function getHolder(func) {
   var object = func;
   return object.placeholder;
 }
 
-module.exports = getPlaceholder;
+module.exports = getHolder;

_getMapData.js

@@ -0,0 +1,18 @@
+var isKeyable = require('./_isKeyable');
+
+/**
+ * Gets the data for `map`.
+ *
+ * @private
+ * @param {Object} map The map to query.
+ * @param {string} key The reference key.
+ * @returns {*} Returns the map data.
+ */
+function getMapData(map, key) {
+  var data = map.__data__;
+  return isKeyable(key)
+    ? data[typeof key == 'string' ? 'string' : 'hash']
+    : data.map;
+}
+
+module.exports = getMapData;

_getMatchData.js

@@ -1,5 +1,5 @@
 var isStrictComparable = require('./_isStrictComparable'),
-    toPairs = require('./toPairs');
+    keys = require('./keys');
 
 /**
  * Gets the property names, values, and compare flags of `object`.
@@ -9,11 +9,14 @@ var isStrictComparable = require('./_isStrictComparable'),
  * @returns {Array} Returns the match data of `object`.
  */
 function getMatchData(object) {
-  var result = toPairs(object),
+  var result = keys(object),
       length = result.length;
 
   while (length--) {
-    result[length][2] = isStrictComparable(result[length][1]);
+    var key = result[length],
+        value = object[key];
+
+    result[length] = [key, value, isStrictComparable(value)];
   }
   return result;
 }

_getNative.js

@@ -1,4 +1,5 @@
-var isNative = require('./isNative');
+var baseIsNative = require('./_baseIsNative'),
+    getValue = require('./_getValue');
 
 /**
  * Gets the native function at `key` of `object`.
@@ -9,8 +10,8 @@ var isNative = require('./isNative');
  * @returns {*} Returns the function if it's native, else `undefined`.
  */
 function getNative(object, key) {
-  var value = object[key];
+  var value = getValue(object, key);
-  return isNative(value) ? value : undefined;
+  return baseIsNative(value) ? value : undefined;
 }
 
 module.exports = getNative;

_getSymbols.js

@@ -1,3 +1,5 @@
+var stubArray = require('./stubArray');
+
 /** Built-in value references. */
 var getOwnPropertySymbols = Object.getOwnPropertySymbols;
 
@@ -16,9 +18,7 @@ function getSymbols(object) {
 
 // Fallback for IE < 11.
 if (!getOwnPropertySymbols) {
-  getSymbols = function() {
+  getSymbols = stubArray;
-    return [];
-  };
 }
 
 module.exports = getSymbols;

_getValue.js

@@ -0,0 +1,13 @@
+/**
+ * Gets the value at `key` of `object`.
+ *
+ * @private
+ * @param {Object} [object] The object to query.
+ * @param {string} key The key of the property to get.
+ * @returns {*} Returns the property value.
+ */
+function getValue(object, key) {
+  return object == null ? undefined : object[key];
+}
+
+module.exports = getValue;

_hashClear.js

@@ -0,0 +1,14 @@
+var nativeCreate = require('./_nativeCreate');
+
+/**
+ * Removes all key-value entries from the hash.
+ *
+ * @private
+ * @name clear
+ * @memberOf Hash
+ */
+function hashClear() {
+  this.__data__ = nativeCreate ? nativeCreate(null) : {};
+}
+
+module.exports = hashClear;

_hashDelete.js

@@ -1,15 +1,15 @@
-var hashHas = require('./_hashHas');
-
 /**
  * Removes `key` and its value from the hash.
  *
  * @private
+ * @name delete
+ * @memberOf Hash
  * @param {Object} hash The hash to modify.
  * @param {string} key The key of the value to remove.
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
-function hashDelete(hash, key) {
+function hashDelete(key) {
-  return hashHas(hash, key) && delete hash[key];
+  return this.has(key) && delete this.__data__[key];
 }
 
 module.exports = hashDelete;

_hashGet.js

@@ -13,16 +13,18 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * Gets the hash value for `key`.
  *
  * @private
- * @param {Object} hash The hash to query.
+ * @name get
+ * @memberOf Hash
  * @param {string} key The key of the value to get.
  * @returns {*} Returns the entry value.
  */
-function hashGet(hash, key) {
+function hashGet(key) {
+  var data = this.__data__;
   if (nativeCreate) {
-    var result = hash[key];
+    var result = data[key];
     return result === HASH_UNDEFINED ? undefined : result;
   }
-  return hasOwnProperty.call(hash, key) ? hash[key] : undefined;
+  return hasOwnProperty.call(data, key) ? data[key] : undefined;
 }
 
 module.exports = hashGet;

_hashHas.js

@@ -10,12 +10,14 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * Checks if a hash value for `key` exists.
  *
  * @private
- * @param {Object} hash The hash to query.
+ * @name has
+ * @memberOf Hash
  * @param {string} key The key of the entry to check.
  * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  */
-function hashHas(hash, key) {
+function hashHas(key) {
-  return nativeCreate ? hash[key] !== undefined : hasOwnProperty.call(hash, key);
+  var data = this.__data__;
+  return nativeCreate ? data[key] !== undefined : hasOwnProperty.call(data, key);
 }
 
 module.exports = hashHas;

_hashSet.js

@@ -7,12 +7,16 @@ var HASH_UNDEFINED = '__lodash_hash_undefined__';
  * Sets the hash `key` to `value`.
  *
  * @private
- * @param {Object} hash The hash to modify.
+ * @name set
+ * @memberOf Hash
  * @param {string} key The key of the value to set.
  * @param {*} value The value to set.
+ * @returns {Object} Returns the hash instance.
  */
-function hashSet(hash, key, value) {
+function hashSet(key, value) {
-  hash[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
+  var data = this.__data__;
+  data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
+  return this;
 }
 
 module.exports = hashSet;

_indexOfNaN.js

@@ -9,7 +9,7 @@
  */
 function indexOfNaN(array, fromIndex, fromRight) {
   var length = array.length,
-      index = fromIndex + (fromRight ? 0 : -1);
+      index = fromIndex + (fromRight ? 1 : -1);
 
   while ((fromRight ? index-- : ++index < length)) {
     var other = array[index];

_isFlattenable.js

@@ -1,6 +1,5 @@
 var isArguments = require('./isArguments'),
-    isArray = require('./isArray'),
+    isArray = require('./isArray');
-    isArrayLikeObject = require('./isArrayLikeObject');
 
 /**
  * Checks if `value` is a flattenable `arguments` object or array.
@@ -10,7 +9,7 @@ var isArguments = require('./isArguments'),
  * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
  */
 function isFlattenable(value) {
-  return isArrayLikeObject(value) && (isArray(value) || isArguments(value));
+  return isArray(value) || isArguments(value);
 }
 
 module.exports = isFlattenable;

_isMaskable.js

@@ -0,0 +1,14 @@
+var coreJsData = require('./_coreJsData'),
+    isFunction = require('./isFunction'),
+    stubFalse = require('./stubFalse');
+
+/**
+ * Checks if `func` is capable of being masked.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
+ */
+var isMaskable = !coreJsData ? stubFalse : isFunction;
+
+module.exports = isMaskable;

_isMasked.js

@@ -0,0 +1,20 @@
+var coreJsData = require('./_coreJsData');
+
+/** Used to detect methods masquerading as native. */
+var maskSrcKey = (function() {
+  var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
+  return uid ? ('Symbol(src)_1.' + uid) : '';
+}());
+
+/**
+ * Checks if `func` has its source masked.
+ *
+ * @private
+ * @param {Function} func The function to check.
+ * @returns {boolean} Returns `true` if `func` is masked, else `false`.
+ */
+function isMasked(func) {
+  return !!maskSrcKey && (maskSrcKey in func);
+}
+
+module.exports = isMasked;

_listCacheClear.js

@@ -0,0 +1,12 @@
+/**
+ * Removes all key-value entries from the list cache.
+ *
+ * @private
+ * @name clear
+ * @memberOf ListCache
+ */
+function listCacheClear() {
+  this.__data__ = [];
+}
+
+module.exports = listCacheClear;

_listCacheDelete.js

@@ -7,25 +7,28 @@ var arrayProto = Array.prototype;
 var splice = arrayProto.splice;
 
 /**
- * Removes `key` and its value from the associative array.
+ * Removes `key` and its value from the list cache.
  *
  * @private
- * @param {Array} array The array to modify.
+ * @name delete
+ * @memberOf ListCache
  * @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) {
+function listCacheDelete(key) {
-  var index = assocIndexOf(array, key);
+  var data = this.__data__,
+      index = assocIndexOf(data, key);
+
   if (index < 0) {
     return false;
   }
-  var lastIndex = array.length - 1;
+  var lastIndex = data.length - 1;
   if (index == lastIndex) {
-    array.pop();
+    data.pop();
   } else {
-    splice.call(array, index, 1);
+    splice.call(data, index, 1);
   }
   return true;
 }
 
-module.exports = assocDelete;
+module.exports = listCacheDelete;

_listCacheGet.js

@@ -0,0 +1,19 @@
+var assocIndexOf = require('./_assocIndexOf');
+
+/**
+ * Gets the list cache value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf ListCache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+function listCacheGet(key) {
+  var data = this.__data__,
+      index = assocIndexOf(data, key);
+
+  return index < 0 ? undefined : data[index][1];
+}
+
+module.exports = listCacheGet;

_listCacheHas.js

@@ -1,15 +1,16 @@
 var assocIndexOf = require('./_assocIndexOf');
 
 /**
- * Checks if an associative array value for `key` exists.
+ * Checks if a list cache value for `key` exists.
  *
  * @private
- * @param {Array} array The array to query.
+ * @name has
+ * @memberOf ListCache
  * @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) {
+function listCacheHas(key) {
-  return assocIndexOf(array, key) > -1;
+  return assocIndexOf(this.__data__, key) > -1;
 }
 
-module.exports = assocHas;
+module.exports = listCacheHas;

_listCacheSet.js

@@ -0,0 +1,25 @@
+var assocIndexOf = require('./_assocIndexOf');
+
+/**
+ * Sets the list cache `key` to `value`.
+ *
+ * @private
+ * @name set
+ * @memberOf ListCache
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the list cache instance.
+ */
+function listCacheSet(key, value) {
+  var data = this.__data__,
+      index = assocIndexOf(data, key);
+
+  if (index < 0) {
+    data.push([key, value]);
+  } else {
+    data[index][1] = value;
+  }
+  return this;
+}
+
+module.exports = listCacheSet;

_mapCacheClear.js

@@ -1,4 +1,5 @@
 var Hash = require('./_Hash'),
+    ListCache = require('./_ListCache'),
     Map = require('./_Map');
 
 /**
@@ -8,12 +9,12 @@ var Hash = require('./_Hash'),
  * @name clear
  * @memberOf MapCache
  */
-function mapClear() {
+function mapCacheClear() {
   this.__data__ = {
     'hash': new Hash,
-    'map': Map ? new Map : [],
+    'map': new (Map || ListCache),
     'string': new Hash
   };
 }
 
-module.exports = mapClear;
+module.exports = mapCacheClear;

_mapCacheDelete.js

@@ -0,0 +1,16 @@
+var getMapData = require('./_getMapData');
+
+/**
+ * Removes `key` and its value from the map.
+ *
+ * @private
+ * @name delete
+ * @memberOf MapCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+function mapCacheDelete(key) {
+  return getMapData(this, key)['delete'](key);
+}
+
+module.exports = mapCacheDelete;

_mapCacheGet.js

@@ -0,0 +1,16 @@
+var getMapData = require('./_getMapData');
+
+/**
+ * Gets the map value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf MapCache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+function mapCacheGet(key) {
+  return getMapData(this, key).get(key);
+}
+
+module.exports = mapCacheGet;

_mapCacheHas.js

@@ -0,0 +1,16 @@
+var getMapData = require('./_getMapData');
+
+/**
+ * Checks if a map value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf MapCache
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+function mapCacheHas(key) {
+  return getMapData(this, key).has(key);
+}
+
+module.exports = mapCacheHas;

_mapCacheSet.js

@@ -0,0 +1,18 @@
+var getMapData = require('./_getMapData');
+
+/**
+ * Sets the map `key` to `value`.
+ *
+ * @private
+ * @name set
+ * @memberOf MapCache
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the map cache instance.
+ */
+function mapCacheSet(key, value) {
+  getMapData(this, key).set(key, value);
+  return this;
+}
+
+module.exports = mapCacheSet;

_mapDelete.js

@@ -1,23 +0,0 @@
-var Map = require('./_Map'),
-    assocDelete = require('./_assocDelete'),
-    hashDelete = require('./_hashDelete'),
-    isKeyable = require('./_isKeyable');
-
-/**
- * Removes `key` and its value from the map.
- *
- * @private
- * @name delete
- * @memberOf MapCache
- * @param {string} key The key of the value to remove.
- * @returns {boolean} Returns `true` if the entry was removed, else `false`.
- */
-function mapDelete(key) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    return hashDelete(typeof key == 'string' ? data.string : data.hash, key);
-  }
-  return Map ? data.map['delete'](key) : assocDelete(data.map, key);
-}
-
-module.exports = mapDelete;

_mapGet.js

@@ -1,23 +0,0 @@
-var Map = require('./_Map'),
-    assocGet = require('./_assocGet'),
-    hashGet = require('./_hashGet'),
-    isKeyable = require('./_isKeyable');
-
-/**
- * Gets the map value for `key`.
- *
- * @private
- * @name get
- * @memberOf MapCache
- * @param {string} key The key of the value to get.
- * @returns {*} Returns the entry value.
- */
-function mapGet(key) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    return hashGet(typeof key == 'string' ? data.string : data.hash, key);
-  }
-  return Map ? data.map.get(key) : assocGet(data.map, key);
-}
-
-module.exports = mapGet;

_mapHas.js

@@ -1,23 +0,0 @@
-var Map = require('./_Map'),
-    assocHas = require('./_assocHas'),
-    hashHas = require('./_hashHas'),
-    isKeyable = require('./_isKeyable');
-
-/**
- * Checks if a map value for `key` exists.
- *
- * @private
- * @name has
- * @memberOf MapCache
- * @param {string} key The key of the entry to check.
- * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
- */
-function mapHas(key) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    return hashHas(typeof key == 'string' ? data.string : data.hash, key);
-  }
-  return Map ? data.map.has(key) : assocHas(data.map, key);
-}
-
-module.exports = mapHas;

_mapSet.js

@@ -1,28 +0,0 @@
-var Map = require('./_Map'),
-    assocSet = require('./_assocSet'),
-    hashSet = require('./_hashSet'),
-    isKeyable = require('./_isKeyable');
-
-/**
- * Sets the map `key` to `value`.
- *
- * @private
- * @name set
- * @memberOf MapCache
- * @param {string} key The key of the value to set.
- * @param {*} value The value to set.
- * @returns {Object} Returns the map cache instance.
- */
-function mapSet(key, value) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    hashSet(typeof key == 'string' ? data.string : data.hash, key, value);
-  } else if (Map) {
-    data.map.set(key, value);
-  } else {
-    assocSet(data.map, key, value);
-  }
-  return this;
-}
-
-module.exports = mapSet;

_mapToArray.js

@@ -1,9 +1,9 @@
 /**
- * Converts `map` to an array.
+ * Converts `map` to its key-value pairs.
  *
  * @private
  * @param {Object} map The map to convert.
- * @returns {Array} Returns the converted array.
+ * @returns {Array} Returns the key-value pairs.
  */
 function mapToArray(map) {
   var index = -1,

_matchesStrictComparable.js

@@ -5,7 +5,7 @@
  * @private
  * @param {string} key The key of the property to get.
  * @param {*} srcValue The value to match.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new spec function.
  */
 function matchesStrictComparable(key, srcValue) {
   return function(object) {

_root.js

@@ -1,41 +1,15 @@
 var checkGlobal = require('./_checkGlobal');
 
-/** Used to determine if values are of the language type `Object`. */
-var objectTypes = {
-  'function': true,
-  'object': true
-};
-
-/** Detect free variable `exports`. */
-var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)
-  ? exports
-  : undefined;
-
-/** Detect free variable `module`. */
-var freeModule = (objectTypes[typeof module] && module && !module.nodeType)
-  ? module
-  : undefined;
-
 /** Detect free variable `global` from Node.js. */
-var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);
+var freeGlobal = checkGlobal(typeof global == 'object' && global);
 
 /** Detect free variable `self`. */
-var freeSelf = checkGlobal(objectTypes[typeof self] && self);
+var freeSelf = checkGlobal(typeof self == 'object' && self);
-
-/** Detect free variable `window`. */
-var freeWindow = checkGlobal(objectTypes[typeof window] && window);
 
 /** Detect `this` as the global object. */
-var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
+var thisGlobal = checkGlobal(typeof this == 'object' && this);
 
-/**
+/** Used as a reference to the global object. */
- * Used as a reference to the global object.
+var root = freeGlobal || freeSelf || thisGlobal || Function('return this')();
- *
- * The `this` value is used if it's the global object to avoid Greasemonkey's
- * restricted `window` object, otherwise the `window` object is used.
- */
-var root = freeGlobal ||
-  ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) ||
-    freeSelf || thisGlobal || Function('return this')();
 
 module.exports = root;

_setCacheAdd.js

@@ -0,0 +1,19 @@
+/** Used to stand-in for `undefined` hash values. */
+var HASH_UNDEFINED = '__lodash_hash_undefined__';
+
+/**
+ * Adds `value` to the array cache.
+ *
+ * @private
+ * @name add
+ * @memberOf SetCache
+ * @alias push
+ * @param {*} value The value to cache.
+ * @returns {Object} Returns the cache instance.
+ */
+function setCacheAdd(value) {
+  this.__data__.set(value, HASH_UNDEFINED);
+  return this;
+}
+
+module.exports = setCacheAdd;

_setCacheHas.js

@@ -0,0 +1,14 @@
+/**
+ * Checks if `value` is in the array cache.
+ *
+ * @private
+ * @name has
+ * @memberOf SetCache
+ * @param {*} value The value to search for.
+ * @returns {number} Returns `true` if `value` is found, else `false`.
+ */
+function setCacheHas(value) {
+  return this.__data__.has(value);
+}
+
+module.exports = setCacheHas;

_setToArray.js

@@ -1,9 +1,9 @@
 /**
- * Converts `set` to an array.
+ * Converts `set` to an array of its values.
  *
  * @private
  * @param {Object} set The set to convert.
- * @returns {Array} Returns the converted array.
+ * @returns {Array} Returns the values.
  */
 function setToArray(set) {
   var index = -1,

_setToPairs.js

@@ -0,0 +1,18 @@
+/**
+ * Converts `set` to its value-value pairs.
+ *
+ * @private
+ * @param {Object} set The set to convert.
+ * @returns {Array} Returns the value-value pairs.
+ */
+function setToPairs(set) {
+  var index = -1,
+      result = Array(set.size);
+
+  set.forEach(function(value) {
+    result[++index] = [value, value];
+  });
+  return result;
+}
+
+module.exports = setToPairs;

_stackClear.js

@@ -1,3 +1,5 @@
+var ListCache = require('./_ListCache');
+
 /**
  * Removes all key-value entries from the stack.
  *
@@ -6,7 +8,7 @@
  * @memberOf Stack
  */
 function stackClear() {
-  this.__data__ = { 'array': [], 'map': null };
+  this.__data__ = new ListCache;
 }
 
 module.exports = stackClear;

_stackDelete.js

@@ -1,5 +1,3 @@
-var assocDelete = require('./_assocDelete');
-
 /**
  * Removes `key` and its value from the stack.
  *
@@ -10,10 +8,7 @@ var assocDelete = require('./_assocDelete');
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
 function stackDelete(key) {
-  var data = this.__data__,
+  return this.__data__['delete'](key);
-      array = data.array;
-
-  return array ? assocDelete(array, key) : data.map['delete'](key);
 }
 
 module.exports = stackDelete;

_stackGet.js

@@ -1,5 +1,3 @@
-var assocGet = require('./_assocGet');
-
 /**
  * Gets the stack value for `key`.
  *
@@ -10,10 +8,7 @@ var assocGet = require('./_assocGet');
  * @returns {*} Returns the entry value.
  */
 function stackGet(key) {
-  var data = this.__data__,
+  return this.__data__.get(key);
-      array = data.array;
-
-  return array ? assocGet(array, key) : data.map.get(key);
 }
 
 module.exports = stackGet;

_stackHas.js

@@ -1,5 +1,3 @@
-var assocHas = require('./_assocHas');
-
 /**
  * Checks if a stack value for `key` exists.
  *
@@ -10,10 +8,7 @@ var assocHas = require('./_assocHas');
  * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  */
 function stackHas(key) {
-  var data = this.__data__,
+  return this.__data__.has(key);
-      array = data.array;
-
-  return array ? assocHas(array, key) : data.map.has(key);
 }
 
 module.exports = stackHas;

_stackSet.js

@@ -1,5 +1,5 @@
-var MapCache = require('./_MapCache'),
+var ListCache = require('./_ListCache'),
-    assocSet = require('./_assocSet');
+    MapCache = require('./_MapCache');
 
 /** Used as the size to enable large array optimizations. */
 var LARGE_ARRAY_SIZE = 200;
@@ -15,21 +15,11 @@ var LARGE_ARRAY_SIZE = 200;
  * @returns {Object} Returns the stack cache instance.
  */
 function stackSet(key, value) {
-  var data = this.__data__,
+  var cache = this.__data__;
-      array = data.array;
+  if (cache instanceof ListCache && cache.__data__.length == LARGE_ARRAY_SIZE) {
-
+    cache = this.__data__ = new MapCache(cache.__data__);
-  if (array) {
-    if (array.length < (LARGE_ARRAY_SIZE - 1)) {
-      assocSet(array, key, value);
-    } else {
-      data.array = null;
-      data.map = new MapCache(array);
-    }
-  }
-  var map = data.map;
-  if (map) {
-    map.set(key, value);
   }
+  cache.set(key, value);
   return this;
 }
 

_stringToPath.js

@@ -2,7 +2,7 @@ var memoize = require('./memoize'),
     toString = require('./toString');
 
 /** Used to match property names within property paths. */
-var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]/g;
+var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(\.|\[\])(?:\4|$))/g;
 
 /** Used to match backslashes in property paths. */
 var reEscapeChar = /\\(\\)?/g;

array.js

@@ -12,6 +12,7 @@ module.exports = {
   'fill': require('./fill'),
   'findIndex': require('./findIndex'),
   'findLastIndex': require('./findLastIndex'),
+  'first': require('./first'),
   'flatten': require('./flatten'),
   'flattenDeep': require('./flattenDeep'),
   'flattenDepth': require('./flattenDepth'),

ary.js

@@ -14,7 +14,7 @@ var ARY_FLAG = 128;
  * @param {Function} func The function to cap arguments for.
  * @param {number} [n=func.length] The arity cap.
  * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new capped function.
  * @example
  *
  * _.map(['6', '8', '10'], _.ary(parseInt, 1));

at.js

@@ -11,16 +11,13 @@ var baseAt = require('./_baseAt'),
  * @category Object
  * @param {Object} object The object to iterate over.
  * @param {...(string|string[])} [paths] The property paths of elements to pick.
- * @returns {Array} Returns the new array of picked elements.
+ * @returns {Array} Returns the picked values.
  * @example
  *
  * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
  *
  * _.at(object, ['a[0].b.c', 'a[1]']);
  * // => [3, 4]
- *
- * _.at(['a', 'b', 'c'], 0, 2);
- * // => ['a', 'c']
  */
 var at = rest(function(object, paths) {
   return baseAt(object, baseFlatten(paths, 1));

bind.js

@@ -1,5 +1,5 @@
 var createWrapper = require('./_createWrapper'),
-    getPlaceholder = require('./_getPlaceholder'),
+    getHolder = require('./_getHolder'),
     replaceHolders = require('./_replaceHolders'),
     rest = require('./rest');
 
@@ -14,7 +14,7 @@ var BIND_FLAG = 1,
  * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
  * may be used as a placeholder for partially applied arguments.
  *
- * **Note:** Unlike native `Function#bind` this method doesn't set the "length"
+ * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
  * property of bound functions.
  *
  * @static
@@ -45,7 +45,7 @@ var BIND_FLAG = 1,
 var bind = rest(function(func, thisArg, partials) {
   var bitmask = BIND_FLAG;
   if (partials.length) {
-    var holders = replaceHolders(partials, getPlaceholder(bind));
+    var holders = replaceHolders(partials, getHolder(bind));
     bitmask |= PARTIAL_FLAG;
   }
   return createWrapper(func, bitmask, thisArg, partials, holders);

bindAll.js

@@ -26,7 +26,7 @@ var arrayEach = require('./_arrayEach'),
  *   }
  * };
  *
- * _.bindAll(view, 'onClick');
+ * _.bindAll(view, ['onClick']);
  * jQuery(element).on('click', view.onClick);
  * // => Logs 'clicked docs' when clicked.
  */

bindKey.js

@@ -1,5 +1,5 @@
 var createWrapper = require('./_createWrapper'),
-    getPlaceholder = require('./_getPlaceholder'),
+    getHolder = require('./_getHolder'),
     replaceHolders = require('./_replaceHolders'),
     rest = require('./rest');
 
@@ -56,7 +56,7 @@ var BIND_FLAG = 1,
 var bindKey = rest(function(object, key, partials) {
   var bitmask = BIND_FLAG | BIND_KEY_FLAG;
   if (partials.length) {
-    var holders = replaceHolders(partials, getPlaceholder(bindKey));
+    var holders = replaceHolders(partials, getHolder(bindKey));
     bitmask |= PARTIAL_FLAG;
   }
   return createWrapper(key, bitmask, object, partials, holders);

chunk.js

@@ -18,7 +18,7 @@ var nativeCeil = Math.ceil,
  * @param {Array} array The array to process.
  * @param {number} [size=1] The length of each chunk
  * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
- * @returns {Array} Returns the new array containing chunks.
+ * @returns {Array} Returns the new array of chunks.
  * @example
  *
  * _.chunk(['a', 'b', 'c', 'd'], 2);