Bump to v4.4.0.

LICENSE

@@ -1,22 +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:
+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 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.
+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

@@ -1,4 +1,4 @@
-# lodash-amd v4.1.0
+# lodash-amd v4.4.0
 
 The [lodash](https://lodash.com/) library exported as [AMD](https://github.com/amdjs/amdjs-api/wiki/AMD) modules.
 
@@ -27,4 +27,4 @@ require({
 });
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.1.0-amd) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.4.0-amd) for more details.

_Hash.js

@@ -7,6 +7,7 @@ define(['./_nativeCreate'], function(nativeCreate) {
    * Creates an hash object.
    *
    * @private
+   * @constructor
    * @returns {Object} Returns the new hash object.
    */
   function Hash() {}

_LazyWrapper.js

@@ -7,6 +7,7 @@ define(['./_baseCreate', './_baseLodash'], function(baseCreate, baseLodash) {
    * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
    *
    * @private
+   * @constructor
    * @param {*} value The value to wrap.
    */
   function LazyWrapper(value) {

_MapCache.js

@@ -4,6 +4,7 @@ define(['./_mapClear', './_mapDelete', './_mapGet', './_mapHas', './_mapSet'], f
    * Creates a map cache object to store key-value pairs.
    *
    * @private
+   * @constructor
    * @param {Array} [values] The values to cache.
    */
   function MapCache(values) {

_SetCache.js

@@ -5,6 +5,7 @@ define(['./_MapCache', './_cachePush'], function(MapCache, cachePush) {
    * Creates a set cache object to store unique values.
    *
    * @private
+   * @constructor
    * @param {Array} [values] The values to cache.
    */
   function SetCache(values) {

_Stack.js

@@ -4,6 +4,7 @@ define(['./_stackClear', './_stackDelete', './_stackGet', './_stackHas', './_sta
    * Creates a stack cache object to store key-value pairs.
    *
    * @private
+   * @constructor
    * @param {Array} [values] The values to cache.
    */
   function Stack(values) {

_apply.js

@@ -7,11 +7,11 @@ define([], function() {
    * @private
    * @param {Function} func The function to invoke.
    * @param {*} thisArg The `this` binding of `func`.
-   * @param {...*} [args] The arguments to invoke `func` with.
+   * @param {...*} args The arguments to invoke `func` with.
    * @returns {*} Returns the result of `func`.
    */
   function apply(func, thisArg, args) {
-    var length = args ? args.length : 0;
+    var length = args.length;
     switch (length) {
       case 0: return func.call(thisArg);
       case 1: return func.call(thisArg, args[0]);

_baseCastArrayLikeObject.js

@@ -1,15 +1,15 @@
 define(['./isArrayLikeObject'], function(isArrayLikeObject) {
 
   /**
-   * Converts `value` to an array-like object if it's not one.
+   * Casts `value` to an empty array if it's not an array like object.
    *
    * @private
-   * @param {*} value The value to process.
+   * @param {*} value The value to inspect.
    * @returns {Array} Returns the array-like object.
    */
-  function toArrayLikeObject(value) {
+  function baseCastArrayLikeObject(value) {
     return isArrayLikeObject(value) ? value : [];
   }
 
-  return toArrayLikeObject;
+  return baseCastArrayLikeObject;
 });

_baseCastFunction.js

@@ -0,0 +1,15 @@
+define(['./identity'], function(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;
+  }
+
+  return baseCastFunction;
+});

_baseCastPath.js

@@ -0,0 +1,15 @@
+define(['./isArray', './_stringToPath'], function(isArray, 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);
+  }
+
+  return baseCastPath;
+});

_baseClone.js

@@ -1,4 +1,4 @@
-define(['./_Stack', './_arrayEach', './_assignValue', './_baseAssign', './_baseForOwn', './_copyArray', './_copySymbols', './_getTag', './_initCloneArray', './_initCloneByTag', './_initCloneObject', './isArray', './_isHostObject', './isObject'], function(Stack, arrayEach, assignValue, baseAssign, baseForOwn, copyArray, copySymbols, getTag, initCloneArray, initCloneByTag, initCloneObject, isArray, isHostObject, isObject) {
+define(['./_Stack', './_arrayEach', './_assignValue', './_baseAssign', './_baseForOwn', './_cloneBuffer', './_copyArray', './_copySymbols', './_getTag', './_initCloneArray', './_initCloneByTag', './_initCloneObject', './isArray', './isBuffer', './_isHostObject', './isObject'], function(Stack, arrayEach, assignValue, baseAssign, baseForOwn, cloneBuffer, copyArray, copySymbols, getTag, initCloneArray, initCloneByTag, initCloneObject, isArray, isBuffer, isHostObject, isObject) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -81,6 +81,9 @@ define(['./_Stack', './_arrayEach', './_assignValue', './_baseAssign', './_baseF
       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 : {};

_baseCreate.js

@@ -1,7 +1,7 @@
 define(['./isObject'], function(isObject) {
 
-  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
-  var undefined;
+  /** Built-in value references. */
+  var objectCreate = Object.create;
 
   /**
    * The base implementation of `_.create` without support for assigning
@@ -11,17 +11,9 @@ define(['./isObject'], function(isObject) {
    * @param {Object} prototype The object to inherit from.
    * @returns {Object} Returns the new object.
    */
-  var baseCreate = (function() {
-    function object() {}
-    return function(prototype) {
-      if (isObject(prototype)) {
-        object.prototype = prototype;
-        var result = new object;
-        object.prototype = undefined;
-      }
-      return result || {};
-    };
-  }());
+  function baseCreate(proto) {
+    return isObject(proto) ? objectCreate(proto) : {};
+  }
 
   return baseCreate;
 });

_baseDelay.js

@@ -13,7 +13,7 @@ define([], function() {
    * @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) {

_baseFlatten.js

@@ -5,12 +5,12 @@ define(['./_arrayPush', './isArguments', './isArray', './isArrayLikeObject'], fu
    *
    * @private
    * @param {Array} array The array to flatten.
-   * @param {boolean} [isDeep] Specify a deep 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, isDeep, isStrict, result) {
+  function baseFlatten(array, depth, isStrict, result) {
     result || (result = []);
 
     var index = -1,
@@ -18,11 +18,11 @@ define(['./_arrayPush', './isArguments', './isArray', './isArrayLikeObject'], fu
 
     while (++index < length) {
       var value = array[index];
-      if (isArrayLikeObject(value) &&
+      if (depth > 0 && isArrayLikeObject(value) &&
           (isStrict || isArray(value) || isArguments(value))) {
-        if (isDeep) {
+        if (depth > 1) {
           // Recursively flatten arrays (susceptible to call stack limits).
-          baseFlatten(value, isDeep, isStrict, result);
+          baseFlatten(value, depth - 1, isStrict, result);
         } else {
           arrayPush(result, value);
         }

_baseFunctions.js

@@ -2,7 +2,7 @@ define(['./_arrayFilter', './isFunction'], function(arrayFilter, isFunction) {
 
   /**
    * The base implementation of `_.functions` which creates an array of
-   * `object` function property names filtered from those provided.
+   * `object` function property names filtered from `props`.
    *
    * @private
    * @param {Object} object The object to inspect.

_baseGet.js

@@ -1,4 +1,4 @@
-define(['./_baseToPath', './_isKey'], function(baseToPath, isKey) {
+define(['./_baseCastPath', './_isKey'], function(baseCastPath, isKey) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -12,7 +12,7 @@ define(['./_baseToPath', './_isKey'], function(baseToPath, isKey) {
    * @returns {*} Returns the resolved value.
    */
   function baseGet(object, path) {
-    path = isKey(path, object) ? [path + ''] : baseToPath(path);
+    path = isKey(path, object) ? [path + ''] : baseCastPath(path);
 
     var index = 0,
         length = path.length;

_baseIntersection.js

@@ -40,11 +40,17 @@ define(['./_SetCache', './_arrayIncludes', './_arrayIncludesWith', './_arrayMap'
       var value = array[index],
           computed = iteratee ? iteratee(value) : value;
 
-      if (!(seen ? cacheHas(seen, computed) : includes(result, computed, comparator))) {
+      if (!(seen
+            ? cacheHas(seen, computed)
+            : includes(result, computed, comparator)
+          )) {
         var othIndex = othLength;
         while (--othIndex) {
           var cache = caches[othIndex];
-          if (!(cache ? cacheHas(cache, computed) : includes(arrays[othIndex], computed, comparator))) {
+          if (!(cache
+                ? cacheHas(cache, computed)
+                : includes(arrays[othIndex], computed, comparator))
+              ) {
             continue outer;
           }
         }

_baseInvoke.js

@@ -1,4 +1,4 @@
-define(['./_apply', './_baseToPath', './_isKey', './last', './_parent'], function(apply, baseToPath, isKey, last, parent) {
+define(['./_apply', './_baseCastPath', './_isKey', './last', './_parent'], function(apply, baseCastPath, isKey, last, parent) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -15,7 +15,7 @@ define(['./_apply', './_baseToPath', './_isKey', './last', './_parent'], functio
    */
   function baseInvoke(object, path, args) {
     if (!isKey(path, object)) {
-      path = baseToPath(path);
+      path = baseCastPath(path);
       object = parent(object, path);
       path = last(path);
     }

_baseKeys.js

@@ -8,7 +8,6 @@ define([], function() {
    * property of prototypes or treat sparse arrays as dense.
    *
    * @private
-   * @type Function
    * @param {Object} object The object to query.
    * @returns {Array} Returns the array of property names.
    */

_baseMerge.js

@@ -17,7 +17,10 @@ define(['./_Stack', './_arrayEach', './_assignMergeValue', './_baseMergeDeep', '
     if (object === source) {
       return;
     }
-    var props = (isArray(source) || isTypedArray(source)) ? undefined : keysIn(source);
+    var props = (isArray(source) || isTypedArray(source))
+      ? undefined
+      : keysIn(source);
+
     arrayEach(props || source, function(srcValue, key) {
       if (props) {
         key = srcValue;
@@ -28,7 +31,10 @@ define(['./_Stack', './_arrayEach', './_assignMergeValue', './_baseMergeDeep', '
         baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
       }
       else {
-        var newValue = customizer ? customizer(object[key], srcValue, (key + ''), object, source, stack) : undefined;
+        var newValue = customizer
+          ? customizer(object[key], srcValue, (key + ''), object, source, stack)
+          : undefined;
+
         if (newValue === undefined) {
           newValue = srcValue;
         }

_baseMergeDeep.js

@@ -26,21 +26,24 @@ define(['./_assignMergeValue', './_baseClone', './_copyArray', './isArguments',
       assignMergeValue(object, key, stacked);
       return;
     }
-    var newValue = customizer ? customizer(objValue, srcValue, (key + ''), object, source, stack) : undefined,
-        isCommon = newValue === undefined;
+    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 = srcIndex ? copyArray(objValue) : objValue;
+          newValue = objValue;
         }
         else if (isArrayLikeObject(objValue)) {
           newValue = copyArray(objValue);
         }
         else {
           isCommon = false;
-          newValue = baseClone(srcValue);
+          newValue = baseClone(srcValue, true);
         }
       }
       else if (isPlainObject(srcValue) || isArguments(srcValue)) {
@@ -49,10 +52,10 @@ define(['./_assignMergeValue', './_baseClone', './_copyArray', './isArguments',
         }
         else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
           isCommon = false;
-          newValue = baseClone(srcValue);
+          newValue = baseClone(srcValue, true);
         }
         else {
-          newValue = srcIndex ? baseClone(objValue) : objValue;
+          newValue = objValue;
         }
       }
       else {

_basePullAt.js

@@ -1,4 +1,4 @@
-define(['./_baseToPath', './_isIndex', './_isKey', './last', './_parent'], function(baseToPath, isIndex, isKey, last, parent) {
+define(['./_baseCastPath', './_isIndex', './_isKey', './last', './_parent'], function(baseCastPath, isIndex, isKey, last, parent) {
 
   /** Used for built-in method references. */
   var arrayProto = Array.prototype;
@@ -27,7 +27,7 @@ define(['./_baseToPath', './_isIndex', './_isKey', './last', './_parent'], funct
           splice.call(array, index, 1);
         }
         else if (!isKey(index, array)) {
-          var path = baseToPath(index),
+          var path = baseCastPath(index),
               object = parent(array, path);
 
           if (object != null) {

_baseSet.js

@@ -1,4 +1,4 @@
-define(['./_assignValue', './_baseToPath', './_isIndex', './_isKey', './isObject'], function(assignValue, baseToPath, isIndex, isKey, isObject) {
+define(['./_assignValue', './_baseCastPath', './_isIndex', './_isKey', './isObject'], function(assignValue, baseCastPath, isIndex, isKey, isObject) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -14,7 +14,7 @@ define(['./_assignValue', './_baseToPath', './_isIndex', './_isKey', './isObject
    * @returns {Object} Returns `object`.
    */
   function baseSet(object, path, value, customizer) {
-    path = isKey(path, object) ? [path + ''] : baseToPath(path);
+    path = isKey(path, object) ? [path + ''] : baseCastPath(path);
 
     var index = -1,
         length = path.length,
@@ -29,7 +29,9 @@ define(['./_assignValue', './_baseToPath', './_isIndex', './_isKey', './isObject
           var objValue = nested[key];
           newValue = customizer ? customizer(objValue, key, nested) : undefined;
           if (newValue === undefined) {
-            newValue = objValue == null ? (isIndex(path[index + 1]) ? [] : {}) : objValue;
+            newValue = objValue == null
+              ? (isIndex(path[index + 1]) ? [] : {})
+              : objValue;
           }
         }
         assignValue(nested, key, newValue);

_baseSum.js

@@ -22,7 +22,7 @@ define([], function() {
         result = result === undefined ? current : (result + current);
       }
     }
-    return length ? result : 0;
+    return result;
   }
 
   return baseSum;

_baseToPath.js

@@ -1,16 +0,0 @@
-define(['./isArray', './_stringToPath'], function(isArray, stringToPath) {
-
-  /**
-   * The base implementation of `_.toPath` which only converts `value` to a
-   * path if it's not one.
-   *
-   * @private
-   * @param {*} value The value to process.
-   * @returns {Array} Returns the property path array.
-   */
-  function baseToPath(value) {
-    return isArray(value) ? value : stringToPath(value);
-  }
-
-  return baseToPath;
-});

_baseUnset.js

@@ -1,4 +1,4 @@
-define(['./_baseToPath', './has', './_isKey', './last', './_parent'], function(baseToPath, has, isKey, last, parent) {
+define(['./_baseCastPath', './has', './_isKey', './last', './_parent'], function(baseCastPath, has, isKey, last, parent) {
 
   /**
    * The base implementation of `_.unset`.
@@ -9,7 +9,7 @@ define(['./_baseToPath', './has', './_isKey', './last', './_parent'], function(b
    * @returns {boolean} Returns `true` if the property is deleted, else `false`.
    */
   function baseUnset(object, path) {
-    path = isKey(path, object) ? [path + ''] : baseToPath(path);
+    path = isKey(path, object) ? [path + ''] : baseCastPath(path);
     object = parent(object, path);
     var key = last(path);
     return (object != null && has(object, key)) ? delete object[key] : true;

_cloneArrayBuffer.js

@@ -0,0 +1,20 @@
+define(['./_Uint8Array'], function(Uint8Array) {
+
+  /**
+   * Creates a clone of `arrayBuffer`.
+   *
+   * @private
+   * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
+   * @returns {ArrayBuffer} Returns the cloned array buffer.
+   */
+  function cloneArrayBuffer(arrayBuffer) {
+    var Ctor = arrayBuffer.constructor,
+        result = new Ctor(arrayBuffer.byteLength),
+        view = new Uint8Array(result);
+
+    view.set(new Uint8Array(arrayBuffer));
+    return result;
+  }
+
+  return cloneArrayBuffer;
+});

_cloneBuffer.js

@@ -1,18 +1,21 @@
-define(['./_Uint8Array'], function(Uint8Array) {
+define([], function() {
 
   /**
-   * Creates a clone of `buffer`.
+   * Creates a clone of  `buffer`.
    *
    * @private
-   * @param {ArrayBuffer} buffer The array buffer to clone.
-   * @returns {ArrayBuffer} Returns the cloned array buffer.
+   * @param {Buffer} buffer The buffer to clone.
+   * @param {boolean} [isDeep] Specify a deep clone.
+   * @returns {Buffer} Returns the cloned buffer.
    */
-  function cloneBuffer(buffer) {
+  function cloneBuffer(buffer, isDeep) {
+    if (isDeep) {
+      return buffer.slice();
+    }
     var Ctor = buffer.constructor,
-        result = new Ctor(buffer.byteLength),
-        view = new Uint8Array(result);
+        result = new Ctor(buffer.length);
 
-    view.set(new Uint8Array(buffer));
+    buffer.copy(result);
     return result;
   }
 

_cloneTypedArray.js

@@ -1,4 +1,4 @@
-define(['./_cloneBuffer'], function(cloneBuffer) {
+define(['./_cloneArrayBuffer'], function(cloneArrayBuffer) {
 
   /**
    * Creates a clone of `typedArray`.
@@ -9,10 +9,11 @@ define(['./_cloneBuffer'], function(cloneBuffer) {
    * @returns {Object} Returns the cloned typed array.
    */
   function cloneTypedArray(typedArray, isDeep) {
-    var buffer = typedArray.buffer,
+    var arrayBuffer = typedArray.buffer,
+        buffer = isDeep ? cloneArrayBuffer(arrayBuffer) : arrayBuffer,
         Ctor = typedArray.constructor;
 
-    return new Ctor(isDeep ? cloneBuffer(buffer) : buffer, typedArray.byteOffset, typedArray.length);
+    return new Ctor(buffer, typedArray.byteOffset, typedArray.length);
   }
 
   return cloneTypedArray;

_copyObjectWith.js

@@ -18,8 +18,11 @@ define(['./_assignValue'], function(assignValue) {
         length = props.length;
 
     while (++index < length) {
-      var key = props[index],
-          newValue = customizer ? customizer(object[key], source[key], key, object, source) : source[key];
+      var key = props[index];
+
+      var newValue = customizer
+        ? customizer(object[key], source[key], key, object, source)
+        : source[key];
 
       assignValue(object, key, newValue);
     }

_createAssigner.js

@@ -17,7 +17,10 @@ define(['./_isIterateeCall', './rest'], function(isIterateeCall, rest) {
           customizer = length > 1 ? sources[length - 1] : undefined,
           guard = length > 2 ? sources[2] : undefined;
 
-      customizer = typeof customizer == 'function' ? (length--, customizer) : undefined;
+      customizer = typeof customizer == 'function'
+        ? (length--, customizer)
+        : undefined;
+
       if (guard && isIterateeCall(sources[0], sources[1], guard)) {
         customizer = length < 3 ? undefined : customizer;
         length = 1;

_createCaseFirst.js

@@ -26,8 +26,11 @@ define(['./_stringToArray', './toString'], function(stringToArray, toString) {
     return function(string) {
       string = toString(string);
 
-      var strSymbols = reHasComplexSymbol.test(string) ? stringToArray(string) : undefined,
-          chr = strSymbols ? strSymbols[0] : string.charAt(0),
+      var strSymbols = reHasComplexSymbol.test(string)
+        ? stringToArray(string)
+        : undefined;
+
+      var chr = strSymbols ? strSymbols[0] : string.charAt(0),
           trailing = strSymbols ? strSymbols.slice(1).join('') : string.slice(1);
 
       return chr[methodName]() + trailing;

_createFlow.js

@@ -24,7 +24,7 @@ define(['./_LodashWrapper', './_baseFlatten', './_getData', './_getFuncName', '.
    */
   function createFlow(fromRight) {
     return rest(function(funcs) {
-      funcs = baseFlatten(funcs);
+      funcs = baseFlatten(funcs, 1);
 
       var length = funcs.length,
           index = length,
@@ -49,7 +49,10 @@ define(['./_LodashWrapper', './_baseFlatten', './_getData', './_getFuncName', '.
         var funcName = getFuncName(func),
             data = funcName == 'wrapper' ? getData(func) : undefined;
 
-        if (data && isLaziable(data[0]) && data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) && !data[4].length && data[9] == 1) {
+        if (data && isLaziable(data[0]) &&
+              data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) &&
+              !data[4].length && data[9] == 1
+            ) {
           wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
         } else {
           wrapper = (func.length == 1 && isLaziable(func)) ? wrapper[funcName]() : wrapper.thru(func);
@@ -59,7 +62,8 @@ define(['./_LodashWrapper', './_baseFlatten', './_getData', './_getFuncName', '.
         var args = arguments,
             value = args[0];
 
-        if (wrapper && args.length == 1 && isArray(value) && value.length >= LARGE_ARRAY_SIZE) {
+        if (wrapper && args.length == 1 &&
+            isArray(value) && value.length >= LARGE_ARRAY_SIZE) {
           return wrapper.plant(value).value();
         }
         var index = 0,

_createHybridWrapper.js

@@ -57,7 +57,10 @@ define(['./_composeArgs', './_composeArgsRight', './_createCtorWrapper', './_cre
 
         length -= argsHolders.length;
         if (length < arity) {
-          return createRecurryWrapper(func, bitmask, createHybridWrapper, placeholder, thisArg, args, argsHolders, argPos, ary, arity - length);
+          return createRecurryWrapper(
+            func, bitmask, createHybridWrapper, placeholder, thisArg, args,
+            argsHolders, argPos, ary, arity - length
+          );
         }
       }
       var thisBinding = isBind ? thisArg : this,

_createOver.js

@@ -9,7 +9,7 @@ define(['./_apply', './_arrayMap', './_baseFlatten', './_baseIteratee', './rest'
    */
   function createOver(arrayFunc) {
     return rest(function(iteratees) {
-      iteratees = arrayMap(baseFlatten(iteratees), baseIteratee);
+      iteratees = arrayMap(baseFlatten(iteratees, 1), baseIteratee);
       return rest(function(args) {
         var thisArg = this;
         return arrayFunc(iteratees, function(iteratee) {

_createRecurryWrapper.js

@@ -41,9 +41,12 @@ define(['./_copyArray', './_isLaziable', './_setData'], function(copyArray, isLa
     if (!(bitmask & CURRY_BOUND_FLAG)) {
       bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
     }
-    var newData = [func, bitmask, thisArg, newPartials, newsHolders, newPartialsRight, newHoldersRight, newArgPos, ary, arity],
-        result = wrapFunc.apply(undefined, newData);
+    var newData = [
+      func, bitmask, thisArg, newPartials, newsHolders, newPartialsRight,
+      newHoldersRight, newArgPos, ary, arity
+    ];
 
+    var result = wrapFunc.apply(undefined, newData);
     if (isLaziable(func)) {
       setData(result, newData);
     }

_createWrapper.js

@@ -62,8 +62,12 @@ define(['./_baseSetData', './_createBaseWrapper', './_createCurryWrapper', './_c
 
       partials = holders = undefined;
     }
-    var data = isBindKey ? undefined : getData(func),
-        newData = [func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity];
+    var data = isBindKey ? undefined : getData(func);
+
+    var newData = [
+      func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
+      argPos, ary, arity
+    ];
 
     if (data) {
       mergeData(newData, data);

_getTag.js

@@ -1,9 +1,10 @@
-define(['./_Map', './_Set'], function(Map, Set) {
+define(['./_Map', './_Set', './_WeakMap'], function(Map, Set, WeakMap) {
 
   /** `Object#toString` result references. */
   var mapTag = '[object Map]',
       objectTag = '[object Object]',
-      setTag = '[object Set]';
+      setTag = '[object Set]',
+      weakMapTag = '[object WeakMap]';
 
   /** Used for built-in method references. */
   var objectProto = Object.prototype;
@@ -17,9 +18,10 @@ define(['./_Map', './_Set'], function(Map, Set) {
    */
   var objectToString = objectProto.toString;
 
-  /** Used to detect maps and sets. */
+  /** Used to detect maps, sets, and weakmaps. */
   var mapCtorString = Map ? funcToString.call(Map) : '',
-      setCtorString = Set ? funcToString.call(Set) : '';
+      setCtorString = Set ? funcToString.call(Set) : '',
+      weakMapCtorString = WeakMap ? funcToString.call(WeakMap) : '';
 
   /**
    * Gets the `toStringTag` of `value`.
@@ -32,19 +34,20 @@ define(['./_Map', './_Set'], function(Map, Set) {
     return objectToString.call(value);
   }
 
-  // Fallback for IE 11 providing `toStringTag` values for maps and sets.
-  if ((Map && getTag(new Map) != mapTag) || (Set && getTag(new Set) != setTag)) {
+  // Fallback for IE 11 providing `toStringTag` values for maps, sets, and weakmaps.
+  if ((Map && getTag(new Map) != mapTag) ||
+      (Set && getTag(new Set) != setTag) ||
+      (WeakMap && getTag(new WeakMap) != weakMapTag)) {
     getTag = function(value) {
       var result = objectToString.call(value),
           Ctor = result == objectTag ? value.constructor : null,
           ctorString = typeof Ctor == 'function' ? funcToString.call(Ctor) : '';
 
       if (ctorString) {
-        if (ctorString == mapCtorString) {
-          return mapTag;
-        }
-        if (ctorString == setCtorString) {
-          return setTag;
+        switch (ctorString) {
+          case mapCtorString: return mapTag;
+          case setCtorString: return setTag;
+          case weakMapCtorString: return weakMapTag;
         }
       }
       return result;

_hasPath.js

@@ -1,4 +1,4 @@
-define(['./_baseToPath', './isArguments', './isArray', './_isIndex', './_isKey', './isLength', './isString', './last', './_parent'], function(baseToPath, isArguments, isArray, isIndex, isKey, isLength, isString, last, parent) {
+define(['./_baseCastPath', './isArguments', './isArray', './_isIndex', './_isKey', './isLength', './isString', './last', './_parent'], function(baseCastPath, isArguments, isArray, isIndex, isKey, isLength, isString, last, parent) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -18,7 +18,7 @@ define(['./_baseToPath', './isArguments', './isArray', './_isIndex', './_isKey',
     }
     var result = hasFunc(object, path);
     if (!result && !isKey(path)) {
-      path = baseToPath(path);
+      path = baseCastPath(path);
       object = parent(object, path);
       if (object != null) {
         path = last(path);

_initCloneByTag.js

@@ -1,4 +1,4 @@
-define(['./_cloneBuffer', './_cloneMap', './_cloneRegExp', './_cloneSet', './_cloneSymbol', './_cloneTypedArray'], function(cloneBuffer, cloneMap, cloneRegExp, cloneSet, cloneSymbol, cloneTypedArray) {
+define(['./_cloneArrayBuffer', './_cloneMap', './_cloneRegExp', './_cloneSet', './_cloneSymbol', './_cloneTypedArray'], function(cloneArrayBuffer, cloneMap, cloneRegExp, cloneSet, cloneSymbol, cloneTypedArray) {
 
   /** `Object#toString` result references. */
   var boolTag = '[object Boolean]',
@@ -37,7 +37,7 @@ define(['./_cloneBuffer', './_cloneMap', './_cloneRegExp', './_cloneSet', './_cl
     var Ctor = object.constructor;
     switch (tag) {
       case arrayBufferTag:
-        return cloneBuffer(object);
+        return cloneArrayBuffer(object);
 
       case boolTag:
       case dateTag:

_isIterateeCall.js

@@ -1,7 +1,7 @@
 define(['./eq', './isArrayLike', './_isIndex', './isObject'], function(eq, isArrayLike, isIndex, isObject) {
 
   /**
-   * Checks if the provided arguments are from an iteratee call.
+   * Checks if the given arguments are from an iteratee call.
    *
    * @private
    * @param {*} value The potential iteratee value argument.

_isKeyable.js

@@ -10,7 +10,7 @@ define([], function() {
   function isKeyable(value) {
     var type = typeof value;
     return type == 'number' || type == 'boolean' ||
-      (type == 'string' && value !== '__proto__') || value == null;
+      (type == 'string' && value != '__proto__') || value == null;
   }
 
   return isKeyable;

_lazyValue.js

@@ -34,7 +34,8 @@ define(['./_baseWrapperValue', './_getView', './isArray'], function(baseWrapperV
         resIndex = 0,
         takeCount = nativeMin(length, this.__takeCount__);
 
-    if (!isArr || arrLength < LARGE_ARRAY_SIZE || (arrLength == length && takeCount == length)) {
+    if (!isArr || arrLength < LARGE_ARRAY_SIZE ||
+        (arrLength == length && takeCount == length)) {
       return baseWrapperValue(array, this.__actions__);
     }
     var result = [];

_mapClear.js

@@ -8,7 +8,11 @@ define(['./_Hash', './_Map'], function(Hash, Map) {
    * @memberOf MapCache
    */
   function mapClear() {
-    this.__data__ = { 'hash': new Hash, 'map': Map ? new Map : [], 'string': new Hash };
+    this.__data__ = {
+      'hash': new Hash,
+      'map': Map ? new Map : [],
+      'string': new Hash
+    };
   }
 
   return mapClear;

_root.js

@@ -1,5 +1,8 @@
 define(['./_checkGlobal'], function(checkGlobal) {
 
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
   /** Used to determine if values are of the language type `Object`. */
   var objectTypes = {
     'function': true,
@@ -7,10 +10,14 @@ define(['./_checkGlobal'], function(checkGlobal) {
   };
 
   /** Detect free variable `exports`. */
-  var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) ? exports : null;
+  var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)
+    ? exports
+    : undefined;
 
   /** Detect free variable `module`. */
-  var freeModule = (objectTypes[typeof module] && module && !module.nodeType) ? module : null;
+  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);
@@ -30,7 +37,9 @@ define(['./_checkGlobal'], function(checkGlobal) {
    * 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')();
+  var root = freeGlobal ||
+    ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) ||
+      freeSelf || thisGlobal || Function('return this')();
 
   return root;
 });

_toFunction.js

@@ -1,15 +0,0 @@
-define(['./identity'], function(identity) {
-
-  /**
-   * Converts `value` to a function if it's not one.
-   *
-   * @private
-   * @param {*} value The value to process.
-   * @returns {Function} Returns the function.
-   */
-  function toFunction(value) {
-    return typeof value == 'function' ? value : identity;
-  }
-
-  return toFunction;
-});

add.js

@@ -19,6 +19,9 @@ define([], function() {
    */
   function add(augend, addend) {
     var result;
+    if (augend === undefined && addend === undefined) {
+      return 0;
+    }
     if (augend !== undefined) {
       result = augend;
     }

array.js

@@ -1,4 +1,4 @@
-define(['./chunk', './compact', './concat', './difference', './differenceBy', './differenceWith', './drop', './dropRight', './dropRightWhile', './dropWhile', './fill', './findIndex', './findLastIndex', './flatMap', './flatten', './flattenDeep', './fromPairs', './head', './indexOf', './initial', './intersection', './intersectionBy', './intersectionWith', './join', './last', './lastIndexOf', './pull', './pullAll', './pullAllBy', './pullAt', './remove', './reverse', './slice', './sortedIndex', './sortedIndexBy', './sortedIndexOf', './sortedLastIndex', './sortedLastIndexBy', './sortedLastIndexOf', './sortedUniq', './sortedUniqBy', './tail', './take', './takeRight', './takeRightWhile', './takeWhile', './union', './unionBy', './unionWith', './uniq', './uniqBy', './uniqWith', './unzip', './unzipWith', './without', './xor', './xorBy', './xorWith', './zip', './zipObject', './zipObjectDeep', './zipWith'], function(chunk, compact, concat, difference, differenceBy, differenceWith, drop, dropRight, dropRightWhile, dropWhile, fill, findIndex, findLastIndex, flatMap, flatten, flattenDeep, fromPairs, head, indexOf, initial, intersection, intersectionBy, intersectionWith, join, last, lastIndexOf, pull, pullAll, pullAllBy, pullAt, remove, reverse, slice, sortedIndex, sortedIndexBy, sortedIndexOf, sortedLastIndex, sortedLastIndexBy, sortedLastIndexOf, sortedUniq, sortedUniqBy, tail, take, takeRight, takeRightWhile, takeWhile, union, unionBy, unionWith, uniq, uniqBy, uniqWith, unzip, unzipWith, without, xor, xorBy, xorWith, zip, zipObject, zipObjectDeep, zipWith) {
+define(['./chunk', './compact', './concat', './difference', './differenceBy', './differenceWith', './drop', './dropRight', './dropRightWhile', './dropWhile', './fill', './findIndex', './findLastIndex', './flatten', './flattenDeep', './flattenDepth', './fromPairs', './head', './indexOf', './initial', './intersection', './intersectionBy', './intersectionWith', './join', './last', './lastIndexOf', './pull', './pullAll', './pullAllBy', './pullAt', './remove', './reverse', './slice', './sortedIndex', './sortedIndexBy', './sortedIndexOf', './sortedLastIndex', './sortedLastIndexBy', './sortedLastIndexOf', './sortedUniq', './sortedUniqBy', './tail', './take', './takeRight', './takeRightWhile', './takeWhile', './union', './unionBy', './unionWith', './uniq', './uniqBy', './uniqWith', './unzip', './unzipWith', './without', './xor', './xorBy', './xorWith', './zip', './zipObject', './zipObjectDeep', './zipWith'], function(chunk, compact, concat, difference, differenceBy, differenceWith, drop, dropRight, dropRightWhile, dropWhile, fill, findIndex, findLastIndex, flatten, flattenDeep, flattenDepth, fromPairs, head, indexOf, initial, intersection, intersectionBy, intersectionWith, join, last, lastIndexOf, pull, pullAll, pullAllBy, pullAt, remove, reverse, slice, sortedIndex, sortedIndexBy, sortedIndexOf, sortedLastIndex, sortedLastIndexBy, sortedLastIndexOf, sortedUniq, sortedUniqBy, tail, take, takeRight, takeRightWhile, takeWhile, union, unionBy, unionWith, uniq, uniqBy, uniqWith, unzip, unzipWith, without, xor, xorBy, xorWith, zip, zipObject, zipObjectDeep, zipWith) {
   return {
     'chunk': chunk,
     'compact': compact,
@@ -13,9 +13,9 @@ define(['./chunk', './compact', './concat', './difference', './differenceBy', '.
     'fill': fill,
     'findIndex': findIndex,
     'findLastIndex': findLastIndex,
-    'flatMap': flatMap,
     'flatten': flatten,
     'flattenDeep': flattenDeep,
+    'flattenDepth': flattenDepth,
     'fromPairs': fromPairs,
     'head': head,
     'indexOf': indexOf,

at.js

@@ -21,7 +21,7 @@ define(['./_baseAt', './_baseFlatten', './rest'], function(baseAt, baseFlatten,
    * // => ['a', 'c']
    */
   var at = rest(function(object, paths) {
-    return baseAt(object, baseFlatten(paths));
+    return baseAt(object, baseFlatten(paths, 1));
   });
 
   return at;

attempt.js

@@ -14,7 +14,7 @@ define(['./_apply', './isError', './rest'], function(apply, isError, rest) {
    * @returns {*} Returns the `func` result or error object.
    * @example
    *
-   * // avoid throwing errors for invalid selectors
+   * // Avoid throwing errors for invalid selectors.
    * var elements = _.attempt(function(selector) {
    *   return document.querySelectorAll(selector);
    * }, '>_>');

bind.js

@@ -34,7 +34,7 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
    * bound('!');
    * // => 'hi fred!'
    *
-   * // using placeholders
+   * // Bound with placeholders.
    * var bound = _.bind(greet, object, _, '!');
    * bound('hi');
    * // => 'hi fred!'
@@ -42,11 +42,16 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
   var bind = rest(function(func, thisArg, partials) {
     var bitmask = BIND_FLAG;
     if (partials.length) {
-      var holders = replaceHolders(partials, bind.placeholder);
+      var placeholder = bind.placeholder,
+          holders = replaceHolders(partials, placeholder);
+
       bitmask |= PARTIAL_FLAG;
     }
     return createWrapper(func, bitmask, thisArg, partials, holders);
   });
 
+  // Assign default placeholders.
+  bind.placeholder = {};
+
   return bind;
 });

bindAll.js

@@ -27,7 +27,7 @@ define(['./_arrayEach', './_baseFlatten', './bind', './rest'], function(arrayEac
    * // => logs 'clicked docs' when clicked
    */
   var bindAll = rest(function(object, methodNames) {
-    arrayEach(baseFlatten(methodNames), function(key) {
+    arrayEach(baseFlatten(methodNames, 1), function(key) {
       object[key] = bind(object[key], object);
     });
     return object;

bindKey.js

@@ -44,7 +44,7 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
    * bound('!');
    * // => 'hiya fred!'
    *
-   * // using placeholders
+   * // Bound with placeholders.
    * var bound = _.bindKey(object, 'greet', _, '!');
    * bound('hi');
    * // => 'hiya fred!'
@@ -52,11 +52,16 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
   var bindKey = rest(function(object, key, partials) {
     var bitmask = BIND_FLAG | BIND_KEY_FLAG;
     if (partials.length) {
-      var holders = replaceHolders(partials, bindKey.placeholder);
+      var placeholder = bindKey.placeholder,
+          holders = replaceHolders(partials, placeholder);
+
       bitmask |= PARTIAL_FLAG;
     }
     return createWrapper(key, bitmask, object, partials, holders);
   });
 
+  // Assign default placeholders.
+  bindKey.placeholder = {};
+
   return bindKey;
 });

castArray.js

@@ -0,0 +1,44 @@
+define(['./isArray'], function(isArray) {
+
+  /**
+   * Casts `value` as an array if it's not one.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to inspect.
+   * @returns {Array} Returns the cast array.
+   * @example
+   *
+   * _.castArray(1);
+   * // => [1]
+   *
+   * _.castArray({ 'a': 1 });
+   * // => [{ 'a': 1 }]
+   *
+   * _.castArray('abc');
+   * // => ['abc']
+   *
+   * _.castArray(null);
+   * // => [null]
+   *
+   * _.castArray(undefined);
+   * // => [undefined]
+   *
+   * _.castArray();
+   * // => []
+   *
+   * var array = [1, 2, 3];
+   * console.log(_.castArray(array) === array);
+   * // => true
+   */
+  function castArray() {
+    if (!arguments.length) {
+      return [];
+    }
+    var value = arguments[0];
+    return isArray(value) ? value : [value];
+  }
+
+  return castArray;
+});

collection.js

@@ -1,4 +1,4 @@
-define(['./at', './countBy', './each', './eachRight', './every', './filter', './find', './findLast', './forEach', './forEachRight', './groupBy', './includes', './invokeMap', './keyBy', './map', './orderBy', './partition', './reduce', './reduceRight', './reject', './sample', './sampleSize', './shuffle', './size', './some', './sortBy'], function(at, countBy, each, eachRight, every, filter, find, findLast, forEach, forEachRight, groupBy, includes, invokeMap, keyBy, map, orderBy, partition, reduce, reduceRight, reject, sample, sampleSize, shuffle, size, some, sortBy) {
+define(['./at', './countBy', './each', './eachRight', './every', './filter', './find', './findLast', './flatMap', './forEach', './forEachRight', './groupBy', './includes', './invokeMap', './keyBy', './map', './orderBy', './partition', './reduce', './reduceRight', './reject', './sample', './sampleSize', './shuffle', './size', './some', './sortBy'], function(at, countBy, each, eachRight, every, filter, find, findLast, flatMap, forEach, forEachRight, groupBy, includes, invokeMap, keyBy, map, orderBy, partition, reduce, reduceRight, reject, sample, sampleSize, shuffle, size, some, sortBy) {
   return {
     'at': at,
     'countBy': countBy,
@@ -8,6 +8,7 @@ define(['./at', './countBy', './each', './eachRight', './every', './filter', './
     'filter': filter,
     'find': find,
     'findLast': findLast,
+    'flatMap': flatMap,
     'forEach': forEach,
     'forEachRight': forEachRight,
     'groupBy': groupBy,

concat.js

@@ -25,7 +25,7 @@ define(['./_arrayConcat', './_baseFlatten', './isArray', './rest'], function(arr
     if (!isArray(array)) {
       array = array == null ? [] : [Object(array)];
     }
-    values = baseFlatten(values);
+    values = baseFlatten(values, 1);
     return arrayConcat(array, values);
   });
 

create.js

@@ -2,7 +2,7 @@ define(['./_baseAssign', './_baseCreate'], function(baseAssign, baseCreate) {
 
   /**
    * Creates an object that inherits from the `prototype` object. If a `properties`
-   * object is provided its own enumerable properties are assigned to the created object.
+   * object is given its own enumerable properties are assigned to the created object.
    *
    * @static
    * @memberOf _

curry.js

@@ -42,7 +42,7 @@ define(['./_createWrapper'], function(createWrapper) {
    * curried(1, 2, 3);
    * // => [1, 2, 3]
    *
-   * // using placeholders
+   * // Curried with placeholders.
    * curried(1)(_, 3)(2);
    * // => [1, 2, 3]
    */
@@ -53,5 +53,8 @@ define(['./_createWrapper'], function(createWrapper) {
     return result;
   }
 
+  // Assign default placeholders.
+  curry.placeholder = {};
+
   return curry;
 });

curryRight.js

@@ -39,7 +39,7 @@ define(['./_createWrapper'], function(createWrapper) {
    * curried(1, 2, 3);
    * // => [1, 2, 3]
    *
-   * // using placeholders
+   * // Curried with placeholders.
    * curried(3)(1, _)(2);
    * // => [1, 2, 3]
    */
@@ -50,5 +50,8 @@ define(['./_createWrapper'], function(createWrapper) {
     return result;
   }
 
+  // Assign default placeholders.
+  curryRight.placeholder = {};
+
   return curryRight;
 });

debounce.js

@@ -20,7 +20,7 @@ define(['./isObject', './now', './toNumber'], function(isObject, now, toNumber)
    * to the debounced function return the result of the last `func` invocation.
    *
    * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked
-   * on the trailing edge of the timeout only if the the debounced function is
+   * on the trailing edge of the timeout only if the debounced function is
    * invoked more than once during the `wait` timeout.
    *
    * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation)
@@ -41,21 +41,21 @@ define(['./isObject', './now', './toNumber'], function(isObject, now, toNumber)
    * @returns {Function} Returns the new debounced function.
    * @example
    *
-   * // avoid costly calculations while the window size is in flux
+   * // Avoid costly calculations while the window size is in flux.
    * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
    *
-   * // invoke `sendMail` when clicked, debouncing subsequent calls
+   * // Invoke `sendMail` when clicked, debouncing subsequent calls.
    * jQuery(element).on('click', _.debounce(sendMail, 300, {
    *   'leading': true,
    *   'trailing': false
    * }));
    *
-   * // ensure `batchLog` is invoked once after 1 second of debounced calls
+   * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
    * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
    * var source = new EventSource('/stream');
    * jQuery(source).on('message', debounced);
    *
-   * // cancel a trailing debounced invocation
+   * // Cancel the trailing debounced invocation.
    * jQuery(window).on('popstate', debounced.cancel);
    */
   function debounce(func, wait, options) {
@@ -136,11 +136,13 @@ define(['./isObject', './now', './toNumber'], function(isObject, now, toNumber)
       if (maxWait === false) {
         var leadingCall = leading && !timeoutId;
       } else {
-        if (!maxTimeoutId && !leading) {
+        if (!lastCalled && !maxTimeoutId && !leading) {
           lastCalled = stamp;
         }
-        var remaining = maxWait - (stamp - lastCalled),
-            isCalled = remaining <= 0 || remaining > maxWait;
+        var remaining = maxWait - (stamp - lastCalled);
+
+        var isCalled = (remaining <= 0 || remaining > maxWait) &&
+          (leading || maxTimeoutId);
 
         if (isCalled) {
           if (maxTimeoutId) {

defer.js

@@ -15,7 +15,7 @@ define(['./_baseDelay', './rest'], function(baseDelay, rest) {
    * _.defer(function(text) {
    *   console.log(text);
    * }, 'deferred');
-   * // logs 'deferred' after one or more milliseconds
+   * // => logs 'deferred' after one or more milliseconds
    */
   var defer = rest(function(func, args) {
     return baseDelay(func, 1, args);

difference.js

@@ -2,7 +2,7 @@ define(['./_baseDifference', './_baseFlatten', './isArrayLikeObject', './rest'],
 
   /**
    * Creates an array of unique `array` values not included in the other
-   * provided arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+   * given arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
    * for equality comparisons.
    *
    * @static
@@ -18,7 +18,7 @@ define(['./_baseDifference', './_baseFlatten', './isArrayLikeObject', './rest'],
    */
   var difference = rest(function(array, values) {
     return isArrayLikeObject(array)
-      ? baseDifference(array, baseFlatten(values, false, true))
+      ? baseDifference(array, baseFlatten(values, 1, true))
       : [];
   });
 

differenceBy.js

@@ -20,7 +20,7 @@ define(['./_baseDifference', './_baseFlatten', './_baseIteratee', './isArrayLike
    * _.differenceBy([3.1, 2.2, 1.3], [4.4, 2.5], Math.floor);
    * // => [3.1, 1.3]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
    * // => [{ 'x': 2 }]
    */
@@ -30,7 +30,7 @@ define(['./_baseDifference', './_baseFlatten', './_baseIteratee', './isArrayLike
       iteratee = undefined;
     }
     return isArrayLikeObject(array)
-      ? baseDifference(array, baseFlatten(values, false, true), baseIteratee(iteratee))
+      ? baseDifference(array, baseFlatten(values, 1, true), baseIteratee(iteratee))
       : [];
   });
 

differenceWith.js

@@ -28,7 +28,7 @@ define(['./_baseDifference', './_baseFlatten', './isArrayLikeObject', './last',
       comparator = undefined;
     }
     return isArrayLikeObject(array)
-      ? baseDifference(array, baseFlatten(values, false, true), undefined, comparator)
+      ? baseDifference(array, baseFlatten(values, 1, true), undefined, comparator)
       : [];
   });
 

dropRightWhile.js

@@ -22,15 +22,15 @@ define(['./_baseIteratee', './_baseWhile'], function(baseIteratee, baseWhile) {
    * _.dropRightWhile(users, function(o) { return !o.active; });
    * // => objects for ['barney']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
    * // => objects for ['barney', 'fred']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.dropRightWhile(users, ['active', false]);
    * // => objects for ['barney']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.dropRightWhile(users, 'active');
    * // => objects for ['barney', 'fred', 'pebbles']
    */

dropWhile.js

@@ -22,15 +22,15 @@ define(['./_baseIteratee', './_baseWhile'], function(baseIteratee, baseWhile) {
    * _.dropWhile(users, function(o) { return !o.active; });
    * // => objects for ['pebbles']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.dropWhile(users, { 'user': 'barney', 'active': false });
    * // => objects for ['fred', 'pebbles']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.dropWhile(users, ['active', false]);
    * // => objects for ['pebbles']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.dropWhile(users, 'active');
    * // => objects for ['barney', 'fred', 'pebbles']
    */

every.js

@@ -25,15 +25,15 @@ define(['./_arrayEvery', './_baseEvery', './_baseIteratee', './isArray', './_isI
    *   { 'user': 'fred',   'active': false }
    * ];
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.every(users, { 'user': 'barney', 'active': false });
    * // => false
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.every(users, ['active', false]);
    * // => true
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.every(users, 'active');
    * // => false
    */

filter.js

@@ -21,15 +21,15 @@ define(['./_arrayFilter', './_baseFilter', './_baseIteratee', './isArray'], func
    * _.filter(users, function(o) { return !o.active; });
    * // => objects for ['fred']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.filter(users, { 'age': 36, 'active': true });
    * // => objects for ['barney']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.filter(users, ['active', false]);
    * // => objects for ['fred']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.filter(users, 'active');
    * // => objects for ['barney']
    */

find.js

@@ -25,15 +25,15 @@ define(['./_baseEach', './_baseFind', './_baseFindIndex', './_baseIteratee', './
    * _.find(users, function(o) { return o.age < 40; });
    * // => object for 'barney'
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.find(users, { 'age': 1, 'active': true });
    * // => object for 'pebbles'
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.find(users, ['active', false]);
    * // => object for 'fred'
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.find(users, 'active');
    * // => object for 'barney'
    */

findIndex.js

@@ -21,15 +21,15 @@ define(['./_baseFindIndex', './_baseIteratee'], function(baseFindIndex, baseIter
    * _.findIndex(users, function(o) { return o.user == 'barney'; });
    * // => 0
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findIndex(users, { 'user': 'fred', 'active': false });
    * // => 1
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findIndex(users, ['active', false]);
    * // => 0
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findIndex(users, 'active');
    * // => 2
    */

findKey.js

@@ -21,15 +21,15 @@ define(['./_baseFind', './_baseForOwn', './_baseIteratee'], function(baseFind, b
    * _.findKey(users, function(o) { return o.age < 40; });
    * // => 'barney' (iteration order is not guaranteed)
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findKey(users, { 'age': 1, 'active': true });
    * // => 'pebbles'
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findKey(users, ['active', false]);
    * // => 'fred'
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findKey(users, 'active');
    * // => 'barney'
    */

findLastIndex.js

@@ -21,15 +21,15 @@ define(['./_baseFindIndex', './_baseIteratee'], function(baseFindIndex, baseIter
    * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
    * // => 2
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findLastIndex(users, { 'user': 'barney', 'active': true });
    * // => 0
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findLastIndex(users, ['active', false]);
    * // => 2
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findLastIndex(users, 'active');
    * // => 0
    */

findLastKey.js

@@ -21,15 +21,15 @@ define(['./_baseFind', './_baseForOwnRight', './_baseIteratee'], function(baseFi
    * _.findLastKey(users, function(o) { return o.age < 40; });
    * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findLastKey(users, { 'age': 36, 'active': true });
    * // => 'barney'
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findLastKey(users, ['active', false]);
    * // => 'fred'
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findLastKey(users, 'active');
    * // => 'pebbles'
    */

flatMap.js

@@ -1,16 +1,16 @@
-define(['./_arrayMap', './_baseFlatten', './_baseIteratee'], function(arrayMap, baseFlatten, baseIteratee) {
+define(['./_baseFlatten', './map'], function(baseFlatten, map) {
 
   /**
-   * Creates an array of flattened values by running each element in `array`
+   * Creates an array of flattened values by running each element in `collection`
    * through `iteratee` and concating its result to the other mapped values.
-   * The iteratee is invoked with three arguments: (value, index|key, array).
+   * The iteratee is invoked with three arguments: (value, index|key, collection).
    *
    * @static
    * @memberOf _
-   * @category Array
-   * @param {Array} array The array to iterate over.
+   * @category Collection
+   * @param {Array|Object} collection The collection to iterate over.
    * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration.
-   * @returns {Array} Returns the new array.
+   * @returns {Array} Returns the new flattened array.
    * @example
    *
    * function duplicate(n) {
@@ -20,9 +20,8 @@ define(['./_arrayMap', './_baseFlatten', './_baseIteratee'], function(arrayMap,
    * _.flatMap([1, 2], duplicate);
    * // => [1, 1, 2, 2]
    */
-  function flatMap(array, iteratee) {
-    var length = array ? array.length : 0;
-    return length ? baseFlatten(arrayMap(array, baseIteratee(iteratee, 3))) : [];
+  function flatMap(collection, iteratee) {
+    return baseFlatten(map(collection, iteratee), 1);
   }
 
   return flatMap;

flatten.js

@@ -1,7 +1,7 @@
 define(['./_baseFlatten'], function(baseFlatten) {
 
   /**
-   * Flattens `array` a single level.
+   * Flattens `array` a single level deep.
    *
    * @static
    * @memberOf _
@@ -10,12 +10,12 @@ define(['./_baseFlatten'], function(baseFlatten) {
    * @returns {Array} Returns the new flattened array.
    * @example
    *
-   * _.flatten([1, [2, 3, [4]]]);
-   * // => [1, 2, 3, [4]]
+   * _.flatten([1, [2, [3, [4]], 5]]);
+   * // => [1, 2, [3, [4]], 5]
    */
   function flatten(array) {
     var length = array ? array.length : 0;
-    return length ? baseFlatten(array) : [];
+    return length ? baseFlatten(array, 1) : [];
   }
 
   return flatten;

flattenDeep.js

@@ -1,21 +1,24 @@
 define(['./_baseFlatten'], function(baseFlatten) {
 
+  /** Used as references for various `Number` constants. */
+  var INFINITY = 1 / 0;
+
   /**
-   * This method is like `_.flatten` except that it recursively flattens `array`.
+   * Recursively flattens `array`.
    *
    * @static
    * @memberOf _
    * @category Array
-   * @param {Array} array The array to recursively flatten.
+   * @param {Array} array The array to flatten.
    * @returns {Array} Returns the new flattened array.
    * @example
    *
-   * _.flattenDeep([1, [2, 3, [4]]]);
-   * // => [1, 2, 3, 4]
+   * _.flattenDeep([1, [2, [3, [4]], 5]]);
+   * // => [1, 2, 3, 4, 5]
    */
   function flattenDeep(array) {
     var length = array ? array.length : 0;
-    return length ? baseFlatten(array, true) : [];
+    return length ? baseFlatten(array, INFINITY) : [];
   }
 
   return flattenDeep;

flattenDepth.js

@@ -0,0 +1,35 @@
+define(['./_baseFlatten', './toInteger'], function(baseFlatten, toInteger) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Recursively flatten `array` up to `depth` times.
+   *
+   * @static
+   * @memberOf _
+   * @category Array
+   * @param {Array} array The array to flatten.
+   * @param {number} [depth=1] The maximum recursion depth.
+   * @returns {Array} Returns the new flattened array.
+   * @example
+   *
+   * var array = [1, [2, [3, [4]], 5]];
+   *
+   * _.flattenDepth(array, 1);
+   * // => [1, 2, [3, [4]], 5]
+   *
+   * _.flattenDepth(array, 2);
+   * // => [1, 2, 3, [4], 5]
+   */
+  function flattenDepth(array, depth) {
+    var length = array ? array.length : 0;
+    if (!length) {
+      return [];
+    }
+    depth = depth === undefined ? 1 : toInteger(depth);
+    return baseFlatten(array, depth);
+  }
+
+  return flattenDepth;
+});

flow.js

@@ -1,9 +1,9 @@
 define(['./_createFlow'], function(createFlow) {
 
   /**
-   * Creates a function that returns the result of invoking the provided
-   * functions with the `this` binding of the created function, where each
-   * successive invocation is supplied the return value of the previous.
+   * Creates a function that returns the result of invoking the given functions
+   * with the `this` binding of the created function, where each successive
+   * invocation is supplied the return value of the previous.
    *
    * @static
    * @memberOf _

flowRight.js

@@ -2,7 +2,7 @@ define(['./_createFlow'], function(createFlow) {
 
   /**
    * This method is like `_.flow` except that it creates a function that
-   * invokes the provided functions from right to left.
+   * invokes the given functions from right to left.
    *
    * @static
    * @memberOf _

forEach.js

@@ -1,4 +1,4 @@
-define(['./_arrayEach', './_baseEach', './isArray', './_toFunction'], function(arrayEach, baseEach, isArray, toFunction) {
+define(['./_arrayEach', './_baseCastFunction', './_baseEach', './isArray'], function(arrayEach, baseCastFunction, baseEach, isArray) {
 
   /**
    * Iterates over elements of `collection` invoking `iteratee` for each element.
@@ -31,7 +31,7 @@ define(['./_arrayEach', './_baseEach', './isArray', './_toFunction'], function(a
   function forEach(collection, iteratee) {
     return (typeof iteratee == 'function' && isArray(collection))
       ? arrayEach(collection, iteratee)
-      : baseEach(collection, toFunction(iteratee));
+      : baseEach(collection, baseCastFunction(iteratee));
   }
 
   return forEach;

forEachRight.js

@@ -1,4 +1,4 @@
-define(['./_arrayEachRight', './_baseEachRight', './isArray', './_toFunction'], function(arrayEachRight, baseEachRight, isArray, toFunction) {
+define(['./_arrayEachRight', './_baseCastFunction', './_baseEachRight', './isArray'], function(arrayEachRight, baseCastFunction, baseEachRight, isArray) {
 
   /**
    * This method is like `_.forEach` except that it iterates over elements of
@@ -21,7 +21,7 @@ define(['./_arrayEachRight', './_baseEachRight', './isArray', './_toFunction'],
   function forEachRight(collection, iteratee) {
     return (typeof iteratee == 'function' && isArray(collection))
       ? arrayEachRight(collection, iteratee)
-      : baseEachRight(collection, toFunction(iteratee));
+      : baseEachRight(collection, baseCastFunction(iteratee));
   }
 
   return forEachRight;

forIn.js

@@ -1,4 +1,4 @@
-define(['./_baseFor', './keysIn', './_toFunction'], function(baseFor, keysIn, toFunction) {
+define(['./_baseCastFunction', './_baseFor', './keysIn'], function(baseCastFunction, baseFor, keysIn) {
 
   /**
    * Iterates over own and inherited enumerable properties of an object invoking
@@ -27,7 +27,9 @@ define(['./_baseFor', './keysIn', './_toFunction'], function(baseFor, keysIn, to
    * // => logs 'a', 'b', then 'c' (iteration order is not guaranteed)
    */
   function forIn(object, iteratee) {
-    return object == null ? object : baseFor(object, toFunction(iteratee), keysIn);
+    return object == null
+      ? object
+      : baseFor(object, baseCastFunction(iteratee), keysIn);
   }
 
   return forIn;

forInRight.js

@@ -1,4 +1,4 @@
-define(['./_baseForRight', './keysIn', './_toFunction'], function(baseForRight, keysIn, toFunction) {
+define(['./_baseCastFunction', './_baseForRight', './keysIn'], function(baseCastFunction, baseForRight, keysIn) {
 
   /**
    * This method is like `_.forIn` except that it iterates over properties of
@@ -25,7 +25,9 @@ define(['./_baseForRight', './keysIn', './_toFunction'], function(baseForRight,
    * // => logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'
    */
   function forInRight(object, iteratee) {
-    return object == null ? object : baseForRight(object, toFunction(iteratee), keysIn);
+    return object == null
+      ? object
+      : baseForRight(object, baseCastFunction(iteratee), keysIn);
   }
 
   return forInRight;

forOwn.js

@@ -1,4 +1,4 @@
-define(['./_baseForOwn', './_toFunction'], function(baseForOwn, toFunction) {
+define(['./_baseCastFunction', './_baseForOwn'], function(baseCastFunction, baseForOwn) {
 
   /**
    * Iterates over own enumerable properties of an object invoking `iteratee`
@@ -27,7 +27,7 @@ define(['./_baseForOwn', './_toFunction'], function(baseForOwn, toFunction) {
    * // => logs 'a' then 'b' (iteration order is not guaranteed)
    */
   function forOwn(object, iteratee) {
-    return object && baseForOwn(object, toFunction(iteratee));
+    return object && baseForOwn(object, baseCastFunction(iteratee));
   }
 
   return forOwn;

forOwnRight.js

@@ -1,4 +1,4 @@
-define(['./_baseForOwnRight', './_toFunction'], function(baseForOwnRight, toFunction) {
+define(['./_baseCastFunction', './_baseForOwnRight'], function(baseCastFunction, baseForOwnRight) {
 
   /**
    * This method is like `_.forOwn` except that it iterates over properties of
@@ -25,7 +25,7 @@ define(['./_baseForOwnRight', './_toFunction'], function(baseForOwnRight, toFunc
    * // => logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'
    */
   function forOwnRight(object, iteratee) {
-    return object && baseForOwnRight(object, toFunction(iteratee));
+    return object && baseForOwnRight(object, baseCastFunction(iteratee));
   }
 
   return forOwnRight;

groupBy.js

@@ -23,7 +23,7 @@ define(['./_createAggregator'], function(createAggregator) {
    * _.groupBy([6.1, 4.2, 6.3], Math.floor);
    * // => { '4': [4.2], '6': [6.1, 6.3] }
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.groupBy(['one', 'two', 'three'], 'length');
    * // => { '3': ['one', 'two'], '5': ['three'] }
    */

identity.js

@@ -1,7 +1,7 @@
 define([], function() {
 
   /**
-   * This method returns the first argument provided to it.
+   * This method returns the first argument given to it.
    *
    * @static
    * @memberOf _

indexOf.js

@@ -7,8 +7,7 @@ define(['./_baseIndexOf', './toInteger'], function(baseIndexOf, toInteger) {
    * Gets the index at which the first occurrence of `value` is found in `array`
    * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
    * for equality comparisons. If `fromIndex` is negative, it's used as the offset
-   * from the end of `array`. If `array` is sorted providing `true` for `fromIndex`
-   * performs a faster binary search.
+   * from the end of `array`.
    *
    * @static
    * @memberOf _
@@ -22,7 +21,7 @@ define(['./_baseIndexOf', './toInteger'], function(baseIndexOf, toInteger) {
    * _.indexOf([1, 2, 1, 2], 2);
    * // => 1
    *
-   * // using `fromIndex`
+   * // Search from the `fromIndex`.
    * _.indexOf([1, 2, 1, 2], 2, 2);
    * // => 3
    */

intersection.js

@@ -1,8 +1,8 @@
-define(['./_arrayMap', './_baseIntersection', './rest', './_toArrayLikeObject'], function(arrayMap, baseIntersection, rest, toArrayLikeObject) {
+define(['./_arrayMap', './_baseCastArrayLikeObject', './_baseIntersection', './rest'], function(arrayMap, baseCastArrayLikeObject, baseIntersection, rest) {
 
   /**
-   * Creates an array of unique values that are included in all of the provided
-   * arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+   * Creates an array of unique values that are included in all given arrays
+   * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
    * for equality comparisons.
    *
    * @static
@@ -16,7 +16,7 @@ define(['./_arrayMap', './_baseIntersection', './rest', './_toArrayLikeObject'],
    * // => [2]
    */
   var intersection = rest(function(arrays) {
-    var mapped = arrayMap(arrays, toArrayLikeObject);
+    var mapped = arrayMap(arrays, baseCastArrayLikeObject);
     return (mapped.length && mapped[0] === arrays[0])
       ? baseIntersection(mapped)
       : [];

intersectionBy.js

@@ -1,4 +1,4 @@
-define(['./_arrayMap', './_baseIntersection', './_baseIteratee', './last', './rest', './_toArrayLikeObject'], function(arrayMap, baseIntersection, baseIteratee, last, rest, toArrayLikeObject) {
+define(['./_arrayMap', './_baseCastArrayLikeObject', './_baseIntersection', './_baseIteratee', './last', './rest'], function(arrayMap, baseCastArrayLikeObject, baseIntersection, baseIteratee, last, rest) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -19,13 +19,13 @@ define(['./_arrayMap', './_baseIntersection', './_baseIteratee', './last', './re
    * _.intersectionBy([2.1, 1.2], [4.3, 2.4], Math.floor);
    * // => [2.1]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
    * // => [{ 'x': 1 }]
    */
   var intersectionBy = rest(function(arrays) {
     var iteratee = last(arrays),
-        mapped = arrayMap(arrays, toArrayLikeObject);
+        mapped = arrayMap(arrays, baseCastArrayLikeObject);
 
     if (iteratee === last(mapped)) {
       iteratee = undefined;

intersectionWith.js

@@ -1,4 +1,4 @@
-define(['./_arrayMap', './_baseIntersection', './last', './rest', './_toArrayLikeObject'], function(arrayMap, baseIntersection, last, rest, toArrayLikeObject) {
+define(['./_arrayMap', './_baseCastArrayLikeObject', './_baseIntersection', './last', './rest'], function(arrayMap, baseCastArrayLikeObject, baseIntersection, last, rest) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -24,7 +24,7 @@ define(['./_arrayMap', './_baseIntersection', './last', './rest', './_toArrayLik
    */
   var intersectionWith = rest(function(arrays) {
     var comparator = last(arrays),
-        mapped = arrayMap(arrays, toArrayLikeObject);
+        mapped = arrayMap(arrays, baseCastArrayLikeObject);
 
     if (comparator === last(mapped)) {
       comparator = undefined;

isArray.js

@@ -5,7 +5,7 @@ define([], function() {
    *
    * @static
    * @memberOf _
-   * @type Function
+   * @type {Function}
    * @category Lang
    * @param {*} value The value to check.
    * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.

isArrayBuffer.js

@@ -0,0 +1,35 @@
+define(['./isObjectLike'], function(isObjectLike) {
+
+  var arrayBufferTag = '[object ArrayBuffer]';
+
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /**
+   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+   * of values.
+   */
+  var objectToString = objectProto.toString;
+
+  /**
+   * Checks if `value` is classified as an `ArrayBuffer` object.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+   * @example
+   *
+   * _.isArrayBuffer(new ArrayBuffer(2));
+   * // => true
+   *
+   * _.isArrayBuffer(new Array(2));
+   * // => false
+   */
+  function isArrayBuffer(value) {
+    return isObjectLike(value) && objectToString.call(value) == arrayBufferTag;
+  }
+
+  return isArrayBuffer;
+});

isArrayLike.js

@@ -7,7 +7,6 @@ define(['./_getLength', './isFunction', './isLength'], function(getLength, isFun
    *
    * @static
    * @memberOf _
-   * @type Function
    * @category Lang
    * @param {*} value The value to check.
    * @returns {boolean} Returns `true` if `value` is array-like, else `false`.

isArrayLikeObject.js

@@ -6,7 +6,6 @@ define(['./isArrayLike', './isObjectLike'], function(isArrayLike, isObjectLike)
    *
    * @static
    * @memberOf _
-   * @type Function
    * @category Lang
    * @param {*} value The value to check.
    * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`.

isBuffer.js

@@ -0,0 +1,51 @@
+define(['./constant', './_root'], function(constant, root) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /** 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 the popular CommonJS extension `module.exports`. */
+  var moduleExports = (freeModule && freeModule.exports === freeExports)
+    ? freeExports
+    : undefined;
+
+  /** Built-in value references. */
+  var Buffer = moduleExports ? root.Buffer : undefined;
+
+  /**
+   * Checks if `value` is a buffer.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
+   * @example
+   *
+   * _.isBuffer(new Buffer(2));
+   * // => true
+   *
+   * _.isBuffer(new Uint8Array(2));
+   * // => false
+   */
+  var isBuffer = !Buffer ? constant(false) : function(value) {
+    return value instanceof Buffer;
+  };
+
+  return isBuffer;
+});

isEmpty.js

@@ -35,7 +35,8 @@ define(['./isArguments', './isArray', './isArrayLike', './isFunction', './isStri
    */
   function isEmpty(value) {
     if (isArrayLike(value) &&
-        (isArray(value) || isString(value) || isFunction(value.splice) || isArguments(value))) {
+        (isArray(value) || isString(value) ||
+          isFunction(value.splice) || isArguments(value))) {
       return !value.length;
     }
     for (var key in value) {

isEqualWith.js

@@ -4,10 +4,10 @@ define(['./_baseIsEqual'], function(baseIsEqual) {
   var undefined;
 
   /**
-   * This method is like `_.isEqual` except that it accepts `customizer` which is
-   * invoked to compare values. If `customizer` returns `undefined` comparisons are
-   * handled by the method instead. The `customizer` is invoked with up to six arguments:
-   * (objValue, othValue [, index|key, object, other, stack]).
+   * This method is like `_.isEqual` except that it accepts `customizer` which
+   * is invoked to compare values. If `customizer` returns `undefined` comparisons
+   * are handled by the method instead. The `customizer` is invoked with up to
+   * six arguments: (objValue, othValue [, index|key, object, other, stack]).
    *
    * @static
    * @memberOf _

isError.js

@@ -30,8 +30,12 @@ define(['./isObjectLike'], function(isObjectLike) {
    * // => false
    */
   function isError(value) {
-    return isObjectLike(value) &&
-      typeof value.message == 'string' && objectToString.call(value) == errorTag;
+    if (!isObjectLike(value)) {
+      return false;
+    }
+    var Ctor = value.constructor;
+    return (objectToString.call(value) == errorTag) ||
+      (typeof Ctor == 'function' && objectToString.call(Ctor.prototype) == errorTag);
   }
 
   return isError;