Bump to v3.5.0.

LICENSE.txt

@@ -1,5 +1,5 @@
 Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
-Based on Underscore.js 1.7.0, copyright 2009-2015 Jeremy Ashkenas,
+Based on Underscore.js, copyright 2009-2015 Jeremy Ashkenas,
 DocumentCloud and Investigative Reporters & Editors <http://underscorejs.org/>
 
 Permission is hereby granted, free of charge, to any person obtaining

README.md

@@ -1,4 +1,4 @@
-# lodash v3.2.0
+# lodash v3.5.0
 
 The [modern build](https://github.com/lodash/lodash/wiki/Build-Differences) of [lodash](https://lodash.com/) exported as [Node.js](http://nodejs.org/)/[io.js](https://iojs.org/) modules.
 
@@ -24,11 +24,11 @@ In Node.js/io.js:
 var _ = require('lodash');
 // or a method category
 var array = require('lodash/array');
-// or a method
+// or a method (great for smaller builds with browserify/webpack)
 var chunk = require('lodash/array/chunk');
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/3.2.0-npm) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/3.5.0-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>
@@ -39,8 +39,8 @@ Install [n_](https://www.npmjs.com/package/n_) for a REPL that includes lodash b
 lodash is also available in a variety of other builds & module formats.
 
  * npm packages for [modern](https://www.npmjs.com/package/lodash), [compatibility](https://www.npmjs.com/package/lodash-compat), & [per method](https://www.npmjs.com/browse/keyword/lodash-modularized) builds
- * AMD modules for [modern](https://github.com/lodash/lodash/tree/3.2.0-amd) & [compatibility](https://github.com/lodash/lodash-compat/tree/3.2.0-amd) builds
- * ES modules for the [modern](https://github.com/lodash/lodash/tree/3.2.0-es) build
+ * AMD modules for [modern](https://github.com/lodash/lodash/tree/3.5.0-amd) & [compatibility](https://github.com/lodash/lodash-compat/tree/3.5.0-amd) builds
+ * ES modules for the [modern](https://github.com/lodash/lodash/tree/3.5.0-es) build
 
 ## Further Reading
 
@@ -57,6 +57,7 @@ lodash is also available in a variety of other builds & module formats.
  * Follows [semantic versioning](http://semver.org/) for releases
  * [Lazily evaluated](http://filimanjaro.com/blog/2014/introducing-lazy-evaluation/) chaining
  * [_(…)](https://lodash.com/docs#_) supports intuitive chaining
+ * [_.add](https://lodash.com/docs#add) for mathematical composition
  * [_.ary](https://lodash.com/docs#ary) & [_.rearg](https://lodash.com/docs#rearg) to change function argument limits & order
  * [_.at](https://lodash.com/docs#at) for cherry-picking collection values
  * [_.attempt](https://lodash.com/docs#attempt) to execute functions which may error without a try-catch
@@ -69,33 +70,31 @@ lodash is also available in a variety of other builds & module formats.
  * [_.curry](https://lodash.com/docs#curry) & [_.curryRight](https://lodash.com/docs#curryRight) for creating [curried](http://hughfdjackson.com/javascript/why-curry-helps/) functions
  * [_.debounce](https://lodash.com/docs#debounce) & [_.throttle](https://lodash.com/docs#throttle) are cancelable & accept options for more control
  * [_.fill](https://lodash.com/docs#fill) to fill arrays with values
- * [_.findIndex](https://lodash.com/docs#findIndex) & [_.findKey](https://lodash.com/docs#findKey) for finding indexes & keys
+ * [_.findKey](https://lodash.com/docs#findKey) for finding keys
  * [_.flow](https://lodash.com/docs#flow) to complement [_.flowRight](https://lodash.com/docs#flowRight) (a.k.a `_.compose`)
  * [_.forEach](https://lodash.com/docs#forEach) supports exiting early
  * [_.forIn](https://lodash.com/docs#forIn) for iterating all enumerable properties
  * [_.forOwn](https://lodash.com/docs#forOwn) for iterating own properties
- * [_.includes](https://lodash.com/docs#includes) accepts a `fromIndex`
- * [_.isError](https://lodash.com/docs#isError) to check for error objects
+ * [_.inRange](https://lodash.com/docs#inRange) for checking whether a number is within a given range
  * [_.isNative](https://lodash.com/docs#isNative) to check for native functions
  * [_.isPlainObject](https://lodash.com/docs#isPlainObject) & [_.toPlainObject](https://lodash.com/docs#toPlainObject) to check for & convert to `Object` objects
  * [_.isTypedArray](https://lodash.com/docs#isTypedArray) to check for typed arrays
- * [_.keysIn](https://lodash.com/docs#keysIn) & [_.valuesIn](https://lodash.com/docs#valuesIn) for getting keys & values of all enumerable properties
- * [_.mapValues](https://lodash.com/docs#mapValues) for [mapping](https://lodash.com/docs#map) values to an object
  * [_.matches](https://lodash.com/docs#matches) supports deep object comparisons
  * [_.matchesProperty](https://lodash.com/docs#matchesProperty) to complement [_.matches](https://lodash.com/docs#matches) & [_.property](https://lodash.com/docs#property)
  * [_.merge](https://lodash.com/docs#merge) for a deep [_.extend](https://lodash.com/docs#extend)
  * [_.parseInt](https://lodash.com/docs#parseInt) for consistent cross-environment behavior
- * [_.propertyOf](https://lodash.com/docs#propertyOf) to complement [_.property](https://lodash.com/docs#property)
  * [_.pull](https://lodash.com/docs#pull), [_.pullAt](https://lodash.com/docs#pullAt), & [_.remove](https://lodash.com/docs#remove) for mutating arrays
  * [_.random](https://lodash.com/docs#random) supports returning floating-point numbers
  * [_.runInContext](https://lodash.com/docs#runInContext) for collisionless mixins & easier mocking
  * [_.slice](https://lodash.com/docs#slice) for creating subsets of array-like values
- * [_.sortByAll](https://lodash.com/docs#sortBy) for sorting by multiple properties
+ * [_.sortByAll](https://lodash.com/docs#sortByAll) & [_.sortByOrder](https://lodash.com/docs#sortByOrder) for sorting by multiple properties & orders
  * [_.spread](https://lodash.com/docs#spread) for creating a function to spread an array of arguments to another
+ * [_.sum](https://lodash.com/docs#sum) to get the sum of values
  * [_.support](https://lodash.com/docs#support) for flagging environment features
  * [_.template](https://lodash.com/docs#template) supports [*“imports”*](https://lodash.com/docs#templateSettings-imports) options & [ES template delimiters](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-template-literal-lexical-components)
  * [_.transform](https://lodash.com/docs#transform) as a powerful alternative to [_.reduce](https://lodash.com/docs#reduce) for transforming objects
  * [_.xor](https://lodash.com/docs#xor) to complement [_.difference](https://lodash.com/docs#difference), [_.intersection](https://lodash.com/docs#intersection), & [_.union](https://lodash.com/docs#union)
+ * [_.valuesIn](https://lodash.com/docs#valuesIn) for getting values of all enumerable properties
  * [_.bind](https://lodash.com/docs#bind), [_.curry](https://lodash.com/docs#curry), [_.partial](https://lodash.com/docs#partial), &
    [more](https://lodash.com/docs "_.bindKey, _.curryRight, _.partialRight") support customizable argument placeholders
  * [_.capitalize](https://lodash.com/docs#capitalize), [_.trim](https://lodash.com/docs#trim), &
@@ -104,8 +103,8 @@ lodash is also available in a variety of other builds & module formats.
    [more](https://lodash.com/docs "_.assign, _.cloneDeep, _.merge") accept callbacks
  * [_.dropWhile](https://lodash.com/docs#dropWhile), [_.takeWhile](https://lodash.com/docs#takeWhile), &
    [more](https://lodash.com/docs "_.drop, _.dropRightWhile, _.take, _.takeRightWhile") to complement [_.first](https://lodash.com/docs#first), [_.initial](https://lodash.com/docs#initial), [_.last](https://lodash.com/docs#last), & [_.rest](https://lodash.com/docs#rest)
- * [_.findLast](https://lodash.com/docs#findLast), [_.findLastIndex](https://lodash.com/docs#findLastIndex), &
-   [more](https://lodash.com/docs "_.findLastKey, _.flowRight, _.forEachRight, _.forInRight, _.forOwnRight, _.partialRight") right-associative methods
+ * [_.findLast](https://lodash.com/docs#findLast), [_.findLastKey](https://lodash.com/docs#findLastKey), &
+   [more](https://lodash.com/docs "_.flowRight, _.forEachRight, _.forInRight, _.forOwnRight, _.partialRight") right-associative methods
  * [_.includes](https://lodash.com/docs#includes), [_.toArray](https://lodash.com/docs#toArray), &
    [more](https://lodash.com/docs "_.at, _.countBy, _.every, _.filter, _.find, _.findLast, _.forEach, _.forEachRight, _.groupBy, _.indexBy, _.invoke, _.map, _.max, _.min, _.partition, _.pluck, _.reduce, _.reduceRight, _.reject, _.shuffle, _.size, _.some, _.sortBy") accept strings
  * [_#commit](https://lodash.com/docs#prototype-commit) & [_#plant](https://lodash.com/docs#prototype-plant) for working with chain sequences
@@ -113,6 +112,5 @@ lodash is also available in a variety of other builds & module formats.
 
 ## Support
 
-Tested in Chrome 39-40, Firefox 34-35, IE 6-11, Opera 26-27, Safari 5-8, io.js 1.2.0, Node.js 0.8.28, 0.10.36, & 0.12.0, PhantomJS 1.9.8, RingoJS 0.11, & Rhino 1.7RC5.
-
+Tested in Chrome 40-41, Firefox 35-36, IE 6-11, Opera 26-27, Safari 5-8, io.js 1.5.0, Node.js 0.8.28, 0.10.36, & 0.12.0, PhantomJS 1.9.8, RingoJS 0.11, & Rhino 1.7RC5.
 Automated [browser](https://saucelabs.com/u/lodash) & [CI](https://travis-ci.org/lodash/lodash/) test runs are available. Special thanks to [Sauce Labs](https://saucelabs.com/) for providing automated browser testing.

array/difference.js

@@ -20,20 +20,21 @@ var baseDifference = require('../internal/baseDifference'),
  * @returns {Array} Returns the new array of filtered values.
  * @example
  *
- * _.difference([1, 2, 3], [5, 2, 10]);
+ * _.difference([1, 2, 3], [4, 2]);
  * // => [1, 3]
  */
 function difference() {
-  var index = -1,
-      length = arguments.length;
+  var args = arguments,
+      index = -1,
+      length = args.length;
 
   while (++index < length) {
-    var value = arguments[index];
+    var value = args[index];
     if (isArray(value) || isArguments(value)) {
       break;
     }
   }
-  return baseDifference(value, baseFlatten(arguments, false, true, ++index));
+  return baseDifference(value, baseFlatten(args, false, true, ++index));
 }
 
 module.exports = difference;

array/dropRightWhile.js

@@ -27,7 +27,9 @@ var baseCallback = require('../internal/baseCallback'),
  * @returns {Array} Returns the slice of `array`.
  * @example
  *
- * _.dropRightWhile([1, 2, 3], function(n) { return n > 1; });
+ * _.dropRightWhile([1, 2, 3], function(n) {
+ *   return n > 1;
+ * });
  * // => [1]
  *
  * var users = [
@@ -37,7 +39,7 @@ var baseCallback = require('../internal/baseCallback'),
  * ];
  *
  * // using the `_.matches` callback shorthand
- * _.pluck(_.dropRightWhile(users, { 'user': pebbles, 'active': false }), 'user');
+ * _.pluck(_.dropRightWhile(users, { 'user': 'pebbles', 'active': false }), 'user');
  * // => ['barney', 'fred']
  *
  * // using the `_.matchesProperty` callback shorthand

array/dropWhile.js

@@ -27,7 +27,9 @@ var baseCallback = require('../internal/baseCallback'),
  * @returns {Array} Returns the slice of `array`.
  * @example
  *
- * _.dropWhile([1, 2, 3], function(n) { return n < 3; });
+ * _.dropWhile([1, 2, 3], function(n) {
+ *   return n < 3;
+ * });
  * // => [3]
  *
  * var users = [

array/findIndex.js

@@ -31,7 +31,9 @@ var baseCallback = require('../internal/baseCallback');
  *   { 'user': 'pebbles', 'active': true }
  * ];
  *
- * _.findIndex(users, function(chr) { return chr.user == 'barney'; });
+ * _.findIndex(users, function(chr) {
+ *   return chr.user == 'barney';
+ * });
  * // => 0
  *
  * // using the `_.matches` callback shorthand

array/findLastIndex.js

@@ -31,16 +31,18 @@ var baseCallback = require('../internal/baseCallback');
  *   { 'user': 'pebbles', 'active': false }
  * ];
  *
- * _.findLastIndex(users, function(chr) { return chr.user == 'pebbles'; });
+ * _.findLastIndex(users, function(chr) {
+ *   return chr.user == 'pebbles';
+ * });
  * // => 2
  *
  * // using the `_.matches` callback shorthand
- * _.findLastIndex(users, { user': 'barney', 'active': true });
+ * _.findLastIndex(users, { 'user': 'barney', 'active': true });
  * // => 0
  *
  * // using the `_.matchesProperty` callback shorthand
  * _.findLastIndex(users, 'active', false);
- * // => 1
+ * // => 2
  *
  * // using the `_.property` callback shorthand
  * _.findLastIndex(users, 'active');

array/flatten.js

@@ -14,11 +14,11 @@ var baseFlatten = require('../internal/baseFlatten'),
  * @returns {Array} Returns the new flattened array.
  * @example
  *
- * _.flatten([1, [2], [3, [[4]]]]);
- * // => [1, 2, 3, [[4]]];
+ * _.flatten([1, [2, 3, [4]]]);
+ * // => [1, 2, 3, [4]];
  *
  * // using `isDeep`
- * _.flatten([1, [2], [3, [[4]]]], true);
+ * _.flatten([1, [2, 3, [4]]], true);
  * // => [1, 2, 3, 4];
  */
 function flatten(array, isDeep, guard) {
@@ -26,7 +26,7 @@ function flatten(array, isDeep, guard) {
   if (guard && isIterateeCall(array, isDeep, guard)) {
     isDeep = false;
   }
-  return length ? baseFlatten(array, isDeep) : [];
+  return length ? baseFlatten(array, isDeep, false, 0) : [];
 }
 
 module.exports = flatten;

array/flattenDeep.js

@@ -10,12 +10,12 @@ var baseFlatten = require('../internal/baseFlatten');
  * @returns {Array} Returns the new flattened array.
  * @example
  *
- * _.flattenDeep([1, [2], [3, [[4]]]]);
+ * _.flattenDeep([1, [2, 3, [4]]]);
  * // => [1, 2, 3, 4];
  */
 function flattenDeep(array) {
   var length = array ? array.length : 0;
-  return length ? baseFlatten(array, true) : [];
+  return length ? baseFlatten(array, true, false, 0) : [];
 }
 
 module.exports = flattenDeep;

array/indexOf.js

@@ -25,15 +25,15 @@ var nativeMax = Math.max;
  * @returns {number} Returns the index of the matched value, else `-1`.
  * @example
  *
- * _.indexOf([1, 2, 3, 1, 2, 3], 2);
+ * _.indexOf([1, 2, 1, 2], 2);
  * // => 1
  *
  * // using `fromIndex`
- * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
- * // => 4
+ * _.indexOf([1, 2, 1, 2], 2, 2);
+ * // => 3
  *
  * // performing a binary search
- * _.indexOf([4, 4, 5, 5, 6, 6], 5, true);
+ * _.indexOf([1, 1, 2, 2], 2, true);
  * // => 2
  */
 function indexOf(array, value, fromIndex) {
@@ -42,14 +42,17 @@ function indexOf(array, value, fromIndex) {
     return -1;
   }
   if (typeof fromIndex == 'number') {
-    fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0);
+    fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : fromIndex;
   } else if (fromIndex) {
     var index = binaryIndex(array, value),
         other = array[index];
 
-    return (value === value ? value === other : other !== other) ? index : -1;
+    if (value === value ? (value === other) : (other !== other)) {
+      return index;
+    }
+    return -1;
   }
-  return baseIndexOf(array, value, fromIndex);
+  return baseIndexOf(array, value, fromIndex || 0);
 }
 
 module.exports = indexOf;

array/intersection.js

@@ -19,9 +19,8 @@ var baseIndexOf = require('../internal/baseIndexOf'),
  * @param {...Array} [arrays] The arrays to inspect.
  * @returns {Array} Returns the new array of shared values.
  * @example
- *
- * _.intersection([1, 2, 3], [5, 2, 1, 4], [2, 1]);
- * // => [1, 2]
+ * _.intersection([1, 2], [4, 2], [2, 1]);
+ * // => [2]
  */
 function intersection() {
   var args = [],
@@ -35,7 +34,7 @@ function intersection() {
     var value = arguments[argsIndex];
     if (isArray(value) || isArguments(value)) {
       args.push(value);
-      caches.push(isCommon && value.length >= 120 && createCache(argsIndex && value));
+      caches.push((isCommon && value.length >= 120) ? createCache(argsIndex && value) : null);
     }
   }
   argsLength = args.length;
@@ -48,11 +47,11 @@ function intersection() {
   outer:
   while (++index < length) {
     value = array[index];
-    if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value)) < 0) {
+    if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value, 0)) < 0) {
       argsIndex = argsLength;
       while (--argsIndex) {
         var cache = caches[argsIndex];
-        if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) {
+        if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value, 0)) < 0) {
           continue outer;
         }
       }

array/lastIndexOf.js

@@ -19,15 +19,15 @@ var nativeMax = Math.max,
  * @returns {number} Returns the index of the matched value, else `-1`.
  * @example
  *
- * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
- * // => 4
+ * _.lastIndexOf([1, 2, 1, 2], 2);
+ * // => 3
  *
  * // using `fromIndex`
- * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
+ * _.lastIndexOf([1, 2, 1, 2], 2, 2);
  * // => 1
  *
  * // performing a binary search
- * _.lastIndexOf([4, 4, 5, 5, 6, 6], 5, true);
+ * _.lastIndexOf([1, 1, 2, 2], 2, true);
  * // => 3
  */
 function lastIndexOf(array, value, fromIndex) {
@@ -41,7 +41,10 @@ function lastIndexOf(array, value, fromIndex) {
   } else if (fromIndex) {
     index = binaryIndex(array, value, true) - 1;
     var other = array[index];
-    return (value === value ? value === other : other !== other) ? index : -1;
+    if (value === value ? (value === other) : (other !== other)) {
+      return index;
+    }
+    return -1;
   }
   if (value !== value) {
     return indexOfNaN(array, index, true);

array/pull.js

@@ -25,22 +25,25 @@ var splice = arrayProto.splice;
  * @example
  *
  * var array = [1, 2, 3, 1, 2, 3];
+ *
  * _.pull(array, 2, 3);
  * console.log(array);
  * // => [1, 1]
  */
 function pull() {
-  var array = arguments[0];
+  var args = arguments,
+      array = args[0];
+
   if (!(array && array.length)) {
     return array;
   }
   var index = 0,
       indexOf = baseIndexOf,
-      length = arguments.length;
+      length = args.length;
 
   while (++index < length) {
     var fromIndex = 0,
-        value = arguments[index];
+        value = args[index];
 
     while ((fromIndex = indexOf(array, value, fromIndex)) > -1) {
       splice.call(array, fromIndex, 1);

array/pullAt.js

@@ -18,7 +18,7 @@ var baseFlatten = require('../internal/baseFlatten'),
  * @example
  *
  * var array = [5, 10, 15, 20];
- * var evens = _.pullAt(array, [1, 3]);
+ * var evens = _.pullAt(array, 1, 3);
  *
  * console.log(array);
  * // => [5, 15]

array/remove.js

@@ -35,7 +35,9 @@ var splice = arrayProto.splice;
  * @example
  *
  * var array = [1, 2, 3, 4];
- * var evens = _.remove(array, function(n) { return n % 2 == 0; });
+ * var evens = _.remove(array, function(n) {
+ *   return n % 2 == 0;
+ * });
  *
  * console.log(array);
  * // => [1, 3]

array/sortedIndex.js

@@ -35,7 +35,7 @@ var baseCallback = require('../internal/baseCallback'),
  * _.sortedIndex([30, 50], 40);
  * // => 1
  *
- * _.sortedIndex([4, 4, 5, 5, 6, 6], 5);
+ * _.sortedIndex([4, 4, 5, 5], 5);
  * // => 2
  *
  * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } };

array/sortedLastIndex.js

@@ -19,7 +19,7 @@ var baseCallback = require('../internal/baseCallback'),
  *  into `array`.
  * @example
  *
- * _.sortedLastIndex([4, 4, 5, 5, 6, 6], 5);
+ * _.sortedLastIndex([4, 4, 5, 5], 5);
  * // => 4
  */
 function sortedLastIndex(array, value, iteratee, thisArg) {

array/takeRightWhile.js

@@ -27,7 +27,9 @@ var baseCallback = require('../internal/baseCallback'),
  * @returns {Array} Returns the slice of `array`.
  * @example
  *
- * _.takeRightWhile([1, 2, 3], function(n) { return n > 1; });
+ * _.takeRightWhile([1, 2, 3], function(n) {
+ *   return n > 1;
+ * });
  * // => [2, 3]
  *
  * var users = [

array/takeWhile.js

@@ -27,7 +27,9 @@ var baseCallback = require('../internal/baseCallback'),
  * @returns {Array} Returns the slice of `array`.
  * @example
  *
- * _.takeWhile([1, 2, 3], function(n) { return n < 3; });
+ * _.takeWhile([1, 2, 3], function(n) {
+ *   return n < 3;
+ * });
  * // => [1, 2]
  *
  * var users = [

array/union.js

@@ -17,11 +17,11 @@ var baseFlatten = require('../internal/baseFlatten'),
  * @returns {Array} Returns the new array of combined values.
  * @example
  *
- * _.union([1, 2, 3], [5, 2, 1, 4], [2, 1]);
- * // => [1, 2, 3, 5, 4]
+ * _.union([1, 2], [4, 2], [2, 1]);
+ * // => [1, 2, 4]
  */
 function union() {
-  return baseUniq(baseFlatten(arguments, false, true));
+  return baseUniq(baseFlatten(arguments, false, true, 0));
 }
 
 module.exports = union;

array/uniq.js

@@ -46,7 +46,9 @@ var baseCallback = require('../internal/baseCallback'),
  * // => [1, 2]
  *
  * // using an iteratee function
- * _.uniq([1, 2.5, 1.5, 2], function(n) { return this.floor(n); }, Math);
+ * _.uniq([1, 2.5, 1.5, 2], function(n) {
+ *   return this.floor(n);
+ * }, Math);
  * // => [1, 2.5]
  *
  * // using the `_.property` callback shorthand
@@ -58,8 +60,7 @@ function uniq(array, isSorted, iteratee, thisArg) {
   if (!length) {
     return [];
   }
-  // Juggle arguments.
-  if (typeof isSorted != 'boolean' && isSorted != null) {
+  if (isSorted != null && typeof isSorted != 'boolean') {
     thisArg = iteratee;
     iteratee = isIterateeCall(array, isSorted, thisArg) ? null : isSorted;
     isSorted = false;

array/without.js

@@ -18,8 +18,8 @@ var baseDifference = require('../internal/baseDifference'),
  * @returns {Array} Returns the new array of filtered values.
  * @example
  *
- * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
- * // => [2, 3, 4]
+ * _.without([1, 2, 1, 3], 1, 2);
+ * // => [3]
  */
 function without(array) {
   return baseDifference(array, baseSlice(arguments, 1));

array/xor.js

@@ -15,11 +15,8 @@ var baseDifference = require('../internal/baseDifference'),
  * @returns {Array} Returns the new array of values.
  * @example
  *
- * _.xor([1, 2, 3], [5, 2, 1, 4]);
- * // => [3, 5, 4]
- *
- * _.xor([1, 2, 5], [2, 3, 5], [3, 4, 5]);
- * // => [1, 4, 5]
+ * _.xor([1, 2], [4, 2]);
+ * // => [1, 4]
  */
 function xor() {
   var index = -1,

chain/chain.js

@@ -19,7 +19,9 @@ var lodash = require('./lodash');
  *
  * var youngest = _.chain(users)
  *   .sortBy('age')
- *   .map(function(chr) { return chr.user + ' is ' + chr.age; })
+ *   .map(function(chr) {
+ *     return chr.user + ' is ' + chr.age;
+ *   })
  *   .first()
  *   .value();
  * // => 'pebbles is 1'

chain/lodash.js

@@ -1,5 +1,6 @@
 var LazyWrapper = require('../internal/LazyWrapper'),
     LodashWrapper = require('../internal/LodashWrapper'),
+    baseLodash = require('../internal/baseLodash'),
     isArray = require('../lang/isArray'),
     isObjectLike = require('../internal/isObjectLike'),
     wrapperClone = require('../internal/wrapperClone');
@@ -26,9 +27,14 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * Chaining is supported in custom builds as long as the `_#value` method is
  * directly or indirectly included in the build.
  *
- * In addition to lodash methods, wrappers also have the following `Array` methods:
- * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
- * and `unshift`
+ * In addition to lodash methods, wrappers have `Array` and `String` methods.
+ *
+ * The wrapper `Array` methods are:
+ * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`,
+ * `splice`, and `unshift`
+ *
+ * The wrapper `String` methods are:
+ * `replace` and `split`
  *
  * The wrapper methods that support shortcut fusion are:
  * `compact`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`,
@@ -48,26 +54,26 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * `mixin`, `negate`, `noop`, `omit`, `once`, `pairs`, `partial`, `partialRight`,
  * `partition`, `pick`, `plant`, `pluck`, `property`, `propertyOf`, `pull`,
  * `pullAt`, `push`, `range`, `rearg`, `reject`, `remove`, `rest`, `reverse`,
- * `shuffle`, `slice`, `sort`, `sortBy`, `sortByAll`, `splice`, `spread`,
- * `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `tap`, `throttle`,
- * `thru`, `times`, `toArray`, `toPlainObject`, `transform`, `union`, `uniq`,
- * `unshift`, `unzip`, `values`, `valuesIn`, `where`, `without`, `wrap`, `xor`,
- * `zip`, and `zipObject`
+ * `shuffle`, `slice`, `sort`, `sortBy`, `sortByAll`, `sortByOrder`, `splice`,
+ * `spread`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `tap`,
+ * `throttle`, `thru`, `times`, `toArray`, `toPlainObject`, `transform`,
+ * `union`, `uniq`, `unshift`, `unzip`, `values`, `valuesIn`, `where`,
+ * `without`, `wrap`, `xor`, `zip`, and `zipObject`
  *
  * The wrapper methods that are **not** chainable by default are:
- * `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `deburr`,
+ * `add`, `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `deburr`,
  * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`,
  * `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, `has`,
- * `identity`, `includes`, `indexOf`, `isArguments`, `isArray`, `isBoolean`,
- * `isDate`, `isElement`, `isEmpty`, `isEqual`, `isError`, `isFinite`,
- * `isFunction`, `isMatch`, `isNative`, `isNaN`, `isNull`, `isNumber`,
+ * `identity`, `includes`, `indexOf`, `inRange`, `isArguments`, `isArray`,
+ * `isBoolean`, `isDate`, `isElement`, `isEmpty`, `isEqual`, `isError`,
+ * `isFinite`,`isFunction`, `isMatch`, `isNative`, `isNaN`, `isNull`, `isNumber`,
  * `isObject`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`,
  * `isTypedArray`, `join`, `kebabCase`, `last`, `lastIndexOf`, `max`, `min`,
  * `noConflict`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`,
  * `random`, `reduce`, `reduceRight`, `repeat`, `result`, `runInContext`,
  * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`,
- * `startCase`, `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`,
- * `trunc`, `unescape`, `uniqueId`, `value`, and `words`
+ * `startCase`, `startsWith`, `sum`, `template`, `trim`, `trimLeft`,
+ * `trimRight`, `trunc`, `unescape`, `uniqueId`, `value`, and `words`
  *
  * The wrapper method `sample` will return a wrapped value when `n` is provided,
  * otherwise an unwrapped value is returned.
@@ -82,11 +88,15 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * var wrapped = _([1, 2, 3]);
  *
  * // returns an unwrapped value
- * wrapped.reduce(function(sum, n) { return sum + n; });
+ * wrapped.reduce(function(sum, n) {
+ *   return sum + n;
+ * });
  * // => 6
  *
  * // returns a wrapped value
- * var squares = wrapped.map(function(n) { return n * n; });
+ * var squares = wrapped.map(function(n) {
+ *   return n * n;
+ * });
  *
  * _.isArray(squares);
  * // => false
@@ -106,4 +116,7 @@ function lodash(value) {
   return new LodashWrapper(value);
 }
 
+// Ensure wrappers are instances of `baseLodash`.
+lodash.prototype = baseLodash.prototype;
+
 module.exports = lodash;

chain/tap.js

@@ -14,7 +14,9 @@
  * @example
  *
  * _([1, 2, 3])
- *  .tap(function(array) { array.pop(); })
+ *  .tap(function(array) {
+ *    array.pop();
+ *  })
  *  .reverse()
  *  .value();
  * // => [2, 1]

chain/thru.js

@@ -12,7 +12,9 @@
  *
  * _([1, 2, 3])
  *  .last()
- *  .thru(function(value) { return [value]; })
+ *  .thru(function(value) {
+ *    return [value];
+ *  })
  *  .value();
  * // => [3]
  */

chain/wrapperPlant.js

@@ -1,4 +1,4 @@
-var LodashWrapper = require('../internal/LodashWrapper'),
+var baseLodash = require('../internal/baseLodash'),
     wrapperClone = require('../internal/wrapperClone');
 
 /**
@@ -28,7 +28,7 @@ function wrapperPlant(value) {
   var result,
       parent = this;
 
-  while (parent instanceof LodashWrapper) {
+  while (parent instanceof baseLodash) {
     var clone = wrapperClone(parent);
     if (result) {
       previous.__wrapped__ = clone;

collection.js

@@ -24,8 +24,8 @@ module.exports = {
   'inject': require('./collection/inject'),
   'invoke': require('./collection/invoke'),
   'map': require('./collection/map'),
-  'max': require('./collection/max'),
-  'min': require('./collection/min'),
+  'max': require('./math/max'),
+  'min': require('./math/min'),
   'partition': require('./collection/partition'),
   'pluck': require('./collection/pluck'),
   'reduce': require('./collection/reduce'),
@@ -38,5 +38,7 @@ module.exports = {
   'some': require('./collection/some'),
   'sortBy': require('./collection/sortBy'),
   'sortByAll': require('./collection/sortByAll'),
+  'sortByOrder': require('./collection/sortByOrder'),
+  'sum': require('./math/sum'),
   'where': require('./collection/where')
 };

collection/at.js

@@ -17,8 +17,8 @@ var baseAt = require('../internal/baseAt'),
  * @returns {Array} Returns the new array of picked elements.
  * @example
  *
- * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]);
- * // => ['a', 'c', 'e']
+ * _.at(['a', 'b', 'c'], [0, 2]);
+ * // => ['a', 'c']
  *
  * _.at(['fred', 'barney', 'pebbles'], 0, 2);
  * // => ['fred', 'pebbles']

collection/countBy.js

@@ -34,10 +34,14 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @returns {Object} Returns the composed aggregate object.
  * @example
  *
- * _.countBy([4.3, 6.1, 6.4], function(n) { return Math.floor(n); });
+ * _.countBy([4.3, 6.1, 6.4], function(n) {
+ *   return Math.floor(n);
+ * });
  * // => { '4': 1, '6': 2 }
  *
- * _.countBy([4.3, 6.1, 6.4], function(n) { return this.floor(n); }, Math);
+ * _.countBy([4.3, 6.1, 6.4], function(n) {
+ *   return this.floor(n);
+ * }, Math);
  * // => { '4': 1, '6': 2 }
  *
  * _.countBy(['one', 'two', 'three'], 'length');

collection/filter.js

@@ -30,8 +30,10 @@ var arrayFilter = require('../internal/arrayFilter'),
  * @returns {Array} Returns the new filtered array.
  * @example
  *
- * var evens = _.filter([1, 2, 3, 4], function(n) { return n % 2 == 0; });
- * // => [2, 4]
+ * _.filter([4, 5, 6], function(n) {
+ *   return n % 2 == 0;
+ * });
+ * // => [4, 6]
  *
  * var users = [
  *   { 'user': 'barney', 'age': 36, 'active': true },

collection/find.js

@@ -37,7 +37,9 @@ var baseCallback = require('../internal/baseCallback'),
  *   { 'user': 'pebbles', 'age': 1,  'active': true }
  * ];
  *
- * _.result(_.find(users, function(chr) { return chr.age < 40; }), 'user');
+ * _.result(_.find(users, function(chr) {
+ *   return chr.age < 40;
+ * }), 'user');
  * // => 'barney'
  *
  * // using the `_.matches` callback shorthand

collection/findLast.js

@@ -16,7 +16,9 @@ var baseCallback = require('../internal/baseCallback'),
  * @returns {*} Returns the matched element, else `undefined`.
  * @example
  *
- * _.findLast([1, 2, 3, 4], function(n) { return n % 2 == 1; });
+ * _.findLast([1, 2, 3, 4], function(n) {
+ *   return n % 2 == 1;
+ * });
  * // => 3
  */
 function findLast(collection, predicate, thisArg) {

collection/forEach.js

@@ -23,10 +23,14 @@ var arrayEach = require('../internal/arrayEach'),
  * @returns {Array|Object|string} Returns `collection`.
  * @example
  *
- * _([1, 2, 3]).forEach(function(n) { console.log(n); }).value();
+ * _([1, 2]).forEach(function(n) {
+ *   console.log(n);
+ * }).value();
  * // => logs each value from left to right and returns the array
  *
- * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(n, key) { console.log(n, key); });
+ * _.forEach({ 'a': 1, 'b': 2 }, function(n, key) {
+ *   console.log(n, key);
+ * });
  * // => logs each value-key pair and returns the object (iteration order is not guaranteed)
  */
 function forEach(collection, iteratee, thisArg) {

collection/forEachRight.js

@@ -17,7 +17,9 @@ var arrayEachRight = require('../internal/arrayEachRight'),
  * @returns {Array|Object|string} Returns `collection`.
  * @example
  *
- * _([1, 2, 3]).forEachRight(function(n) { console.log(n); }).join(',');
+ * _([1, 2]).forEachRight(function(n) {
+ *   console.log(n);
+ * }).join(',');
  * // => logs each value from right to left and returns the array
  */
 function forEachRight(collection, iteratee, thisArg) {

collection/groupBy.js

@@ -34,10 +34,14 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @returns {Object} Returns the composed aggregate object.
  * @example
  *
- * _.groupBy([4.2, 6.1, 6.4], function(n) { return Math.floor(n); });
+ * _.groupBy([4.2, 6.1, 6.4], function(n) {
+ *   return Math.floor(n);
+ * });
  * // => { '4': [4.2], '6': [6.1, 6.4] }
  *
- * _.groupBy([4.2, 6.1, 6.4], function(n) { return this.floor(n); }, Math);
+ * _.groupBy([4.2, 6.1, 6.4], function(n) {
+ *   return this.floor(n);
+ * }, Math);
  * // => { '4': [4.2], '6': [6.1, 6.4] }
  *
  * // using the `_.property` callback shorthand

collection/indexBy.js

@@ -36,10 +36,14 @@ var createAggregator = require('../internal/createAggregator');
  * _.indexBy(keyData, 'dir');
  * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
  *
- * _.indexBy(keyData, function(object) { return String.fromCharCode(object.code); });
+ * _.indexBy(keyData, function(object) {
+ *   return String.fromCharCode(object.code);
+ * });
  * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
  *
- * _.indexBy(keyData, function(object) { return this.fromCharCode(object.code); }, String);
+ * _.indexBy(keyData, function(object) {
+ *   return this.fromCharCode(object.code);
+ * }, String);
  * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
  */
 var indexBy = createAggregator(function(result, value, key) {

collection/map.js

@@ -40,11 +40,15 @@ var arrayMap = require('../internal/arrayMap'),
  * @returns {Array} Returns the new mapped array.
  * @example
  *
- * _.map([1, 2, 3], function(n) { return n * 3; });
- * // => [3, 6, 9]
+ * function timesThree(n) {
+ *   return n * 3;
+ * }
  *
- * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(n) { return n * 3; });
- * // => [3, 6, 9] (iteration order is not guaranteed)
+ * _.map([1, 2], timesThree);
+ * // => [3, 6]
+ *
+ * _.map({ 'a': 1, 'b': 2 }, timesThree);
+ * // => [3, 6] (iteration order is not guaranteed)
  *
  * var users = [
  *   { 'user': 'barney' },

collection/max.js

@@ -1,51 +1 @@
-var arrayMax = require('../internal/arrayMax'),
-    createExtremum = require('../internal/createExtremum');
-
-/**
- * Gets the maximum value of `collection`. If `collection` is empty or falsey
- * `-Infinity` is returned. If an iteratee function is provided it is invoked
- * for each value in `collection` to generate the criterion by which the value
- * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
- * arguments; (value, index, collection).
- *
- * If a property name is provided for `predicate` the created `_.property`
- * style callback returns the property value of the given element.
- *
- * If a value is also provided for `thisArg` the created `_.matchesProperty`
- * style callback returns `true` for elements that have a matching property
- * value, else `false`.
- *
- * If an object is provided for `predicate` the created `_.matches` style
- * callback returns `true` for elements that have the properties of the given
- * object, else `false`.
- *
- * @static
- * @memberOf _
- * @category Collection
- * @param {Array|Object|string} collection The collection to iterate over.
- * @param {Function|Object|string} [iteratee] The function invoked per iteration.
- * @param {*} [thisArg] The `this` binding of `iteratee`.
- * @returns {*} Returns the maximum value.
- * @example
- *
- * _.max([4, 2, 8, 6]);
- * // => 8
- *
- * _.max([]);
- * // => -Infinity
- *
- * var users = [
- *   { 'user': 'barney', 'age': 36 },
- *   { 'user': 'fred',   'age': 40 }
- * ];
- *
- * _.max(users, function(chr) { return chr.age; });
- * // => { 'user': 'fred', 'age': 40 };
- *
- * // using the `_.property` callback shorthand
- * _.max(users, 'age');
- * // => { 'user': 'fred', 'age': 40 };
- */
-var max = createExtremum(arrayMax);
-
-module.exports = max;
+module.exports = require('../math/max');

collection/min.js

@@ -1,51 +1 @@
-var arrayMin = require('../internal/arrayMin'),
-    createExtremum = require('../internal/createExtremum');
-
-/**
- * Gets the minimum value of `collection`. If `collection` is empty or falsey
- * `Infinity` is returned. If an iteratee function is provided it is invoked
- * for each value in `collection` to generate the criterion by which the value
- * is ranked. The `iteratee` is bound to `thisArg` and invoked with three
- * arguments; (value, index, collection).
- *
- * If a property name is provided for `predicate` the created `_.property`
- * style callback returns the property value of the given element.
- *
- * If a value is also provided for `thisArg` the created `_.matchesProperty`
- * style callback returns `true` for elements that have a matching property
- * value, else `false`.
- *
- * If an object is provided for `predicate` the created `_.matches` style
- * callback returns `true` for elements that have the properties of the given
- * object, else `false`.
- *
- * @static
- * @memberOf _
- * @category Collection
- * @param {Array|Object|string} collection The collection to iterate over.
- * @param {Function|Object|string} [iteratee] The function invoked per iteration.
- * @param {*} [thisArg] The `this` binding of `iteratee`.
- * @returns {*} Returns the minimum value.
- * @example
- *
- * _.min([4, 2, 8, 6]);
- * // => 2
- *
- * _.min([]);
- * // => Infinity
- *
- * var users = [
- *   { 'user': 'barney', 'age': 36 },
- *   { 'user': 'fred',   'age': 40 }
- * ];
- *
- * _.min(users, function(chr) { return chr.age; });
- * // => { 'user': 'barney', 'age': 36 };
- *
- * // using the `_.property` callback shorthand
- * _.min(users, 'age');
- * // => { 'user': 'barney', 'age': 36 };
- */
-var min = createExtremum(arrayMin, true);
-
-module.exports = min;
+module.exports = require('../math/min');

collection/partition.js

@@ -27,11 +27,15 @@ var createAggregator = require('../internal/createAggregator');
  * @returns {Array} Returns the array of grouped elements.
  * @example
  *
- * _.partition([1, 2, 3], function(n) { return n % 2; });
+ * _.partition([1, 2, 3], function(n) {
+ *   return n % 2;
+ * });
  * // => [[1, 3], [2]]
  *
- * _.partition([1.2, 2.3, 3.4], function(n) { return this.floor(n) % 2; }, Math);
- * // => [[1, 3], [2]]
+ * _.partition([1.2, 2.3, 3.4], function(n) {
+ *   return this.floor(n) % 2;
+ * }, Math);
+ * // => [[1.2, 3.4], [2.3]]
  *
  * var users = [
  *   { 'user': 'barney',  'age': 36, 'active': false },
@@ -39,7 +43,9 @@ var createAggregator = require('../internal/createAggregator');
  *   { 'user': 'pebbles', 'age': 1,  'active': false }
  * ];
  *
- * var mapper = function(array) { return _.pluck(array, 'user'); };
+ * var mapper = function(array) {
+ *   return _.pluck(array, 'user');
+ * };
  *
  * // using the `_.matches` callback shorthand
  * _.map(_.partition(users, { 'age': 1, 'active': false }), mapper);

collection/reduce.js

@@ -29,14 +29,16 @@ var arrayReduce = require('../internal/arrayReduce'),
  * @returns {*} Returns the accumulated value.
  * @example
  *
- * var sum = _.reduce([1, 2, 3], function(sum, n) { return sum + n; });
- * // => 6
+ * _.reduce([1, 2], function(sum, n) {
+ *   return sum + n;
+ * });
+ * // => 3
  *
- * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, n, key) {
+ * _.reduce({ 'a': 1, 'b': 2 }, function(result, n, key) {
  *   result[key] = n * 3;
  *   return result;
  * }, {});
- * // => { 'a': 3, 'b': 6, 'c': 9 } (iteration order is not guaranteed)
+ * // => { 'a': 3, 'b': 6 } (iteration order is not guaranteed)
  */
 function reduce(collection, iteratee, accumulator, thisArg) {
   var func = isArray(collection) ? arrayReduce : baseReduce;

collection/reduceRight.js

@@ -20,7 +20,10 @@ var arrayReduceRight = require('../internal/arrayReduceRight'),
  * @example
  *
  * var array = [[0, 1], [2, 3], [4, 5]];
- * _.reduceRight(array, function(flattened, other) { return flattened.concat(other); }, []);
+ *
+ * _.reduceRight(array, function(flattened, other) {
+ *   return flattened.concat(other);
+ * }, []);
  * // => [4, 5, 2, 3, 0, 1]
  */
 function reduceRight(collection, iteratee, accumulator, thisArg) {

collection/reject.js

@@ -28,7 +28,9 @@ var arrayFilter = require('../internal/arrayFilter'),
  * @returns {Array} Returns the new filtered array.
  * @example
  *
- * var odds = _.reject([1, 2, 3, 4], function(n) { return n % 2 == 0; });
+ * _.reject([1, 2, 3, 4], function(n) {
+ *   return n % 2 == 0;
+ * });
  * // => [1, 3]
  *
  * var users = [

collection/size.js

@@ -2,8 +2,8 @@ var isLength = require('../internal/isLength'),
     keys = require('../object/keys');
 
 /**
- * Gets the size of `collection` by returning `collection.length` for
- * array-like values or the number of own enumerable properties for objects.
+ * Gets the size of `collection` by returning its length for array-like
+ * values or the number of own enumerable properties for objects.
  *
  * @static
  * @memberOf _
@@ -12,12 +12,12 @@ var isLength = require('../internal/isLength'),
  * @returns {number} Returns the size of `collection`.
  * @example
  *
- * _.size([1, 2]);
- * // => 2
- *
- * _.size({ 'one': 1, 'two': 2, 'three': 3 });
+ * _.size([1, 2, 3]);
  * // => 3
  *
+ * _.size({ 'a': 1, 'b': 2 });
+ * // => 2
+ *
  * _.size('pebbles');
  * // => 7
  */

collection/some.js

@@ -41,7 +41,7 @@ var arraySome = require('../internal/arraySome'),
  * ];
  *
  * // using the `_.matches` callback shorthand
- * _.some(users, { user': 'barney', 'active': false });
+ * _.some(users, { 'user': 'barney', 'active': false });
  * // => false
  *
  * // using the `_.matchesProperty` callback shorthand

collection/sortBy.js

@@ -34,10 +34,14 @@ var baseCallback = require('../internal/baseCallback'),
  * @returns {Array} Returns the new sorted array.
  * @example
  *
- * _.sortBy([1, 2, 3], function(n) { return Math.sin(n); });
+ * _.sortBy([1, 2, 3], function(n) {
+ *   return Math.sin(n);
+ * });
  * // => [3, 1, 2]
  *
- * _.sortBy([1, 2, 3], function(n) { return this.sin(n); }, Math);
+ * _.sortBy([1, 2, 3], function(n) {
+ *   return this.sin(n);
+ * }, Math);
  * // => [3, 1, 2]
  *
  * var users = [
@@ -51,8 +55,11 @@ var baseCallback = require('../internal/baseCallback'),
  * // => ['barney', 'fred', 'pebbles']
  */
 function sortBy(collection, iteratee, thisArg) {
+  if (collection == null) {
+    return [];
+  }
   var index = -1,
-      length = collection ? collection.length : 0,
+      length = collection.length,
       result = isLength(length) ? Array(length) : [];
 
   if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {

collection/sortByAll.js

@@ -1,9 +1,6 @@
-var baseEach = require('../internal/baseEach'),
-    baseFlatten = require('../internal/baseFlatten'),
-    baseSortBy = require('../internal/baseSortBy'),
-    compareMultipleAscending = require('../internal/compareMultipleAscending'),
-    isIterateeCall = require('../internal/isIterateeCall'),
-    isLength = require('../internal/isLength');
+var baseFlatten = require('../internal/baseFlatten'),
+    baseSortByOrder = require('../internal/baseSortByOrder'),
+    isIterateeCall = require('../internal/isIterateeCall');
 
 /**
  * This method is like `_.sortBy` except that it sorts by property names
@@ -29,25 +26,16 @@ var baseEach = require('../internal/baseEach'),
  * // => [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
  */
 function sortByAll(collection) {
-  var args = arguments;
-  if (args.length > 3 && isIterateeCall(args[1], args[2], args[3])) {
+  if (collection == null) {
+    return [];
+  }
+  var args = arguments,
+      guard = args[3];
+
+  if (guard && isIterateeCall(args[1], args[2], guard)) {
     args = [collection, args[1]];
   }
-  var index = -1,
-      length = collection ? collection.length : 0,
-      props = baseFlatten(args, false, false, 1),
-      result = isLength(length) ? Array(length) : [];
-
-  baseEach(collection, function(value) {
-    var length = props.length,
-        criteria = Array(length);
-
-    while (length--) {
-      criteria[length] = value == null ? undefined : value[props[length]];
-    }
-    result[++index] = { 'criteria': criteria, 'index': index, 'value': value };
-  });
-  return baseSortBy(result, compareMultipleAscending);
+  return baseSortByOrder(collection, baseFlatten(args, false, false, 1), []);
 }
 
 module.exports = sortByAll;

collection/sortByOrder.js

@@ -0,0 +1,48 @@
+var baseSortByOrder = require('../internal/baseSortByOrder'),
+    isArray = require('../lang/isArray'),
+    isIterateeCall = require('../internal/isIterateeCall');
+
+/**
+ * This method is like `_.sortByAll` except that it allows specifying the
+ * sort orders of the property names to sort by. A truthy value in `orders`
+ * will sort the corresponding property name in ascending order while a
+ * falsey value will sort it in descending order.
+ *
+ * @static
+ * @memberOf _
+ * @category Collection
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {string[]} props The property names to sort by.
+ * @param {boolean[]} orders The sort orders of `props`.
+ * @param- {Object} [guard] Enables use as a callback for functions like `_.reduce`.
+ * @returns {Array} Returns the new sorted array.
+ * @example
+ *
+ * var users = [
+ *   { 'user': 'barney', 'age': 26 },
+ *   { 'user': 'fred',   'age': 40 },
+ *   { 'user': 'barney', 'age': 36 },
+ *   { 'user': 'fred',   'age': 30 }
+ * ];
+ *
+ * // sort by `user` in ascending order and by `age` in descending order
+ * _.map(_.sortByOrder(users, ['user', 'age'], [true, false]), _.values);
+ * // => [['barney', 36], ['barney', 26], ['fred', 40], ['fred', 30]]
+ */
+function sortByOrder(collection, props, orders, guard) {
+  if (collection == null) {
+    return [];
+  }
+  if (guard && isIterateeCall(props, orders, guard)) {
+    orders = null;
+  }
+  if (!isArray(props)) {
+    props = props == null ? [] : [props];
+  }
+  if (!isArray(orders)) {
+    orders = orders == null ? [] : [orders];
+  }
+  return baseSortByOrder(collection, props, orders);
+}
+
+module.exports = sortByOrder;

collection/sum.js

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

date/now.js

@@ -12,7 +12,9 @@ var nativeNow = isNative(nativeNow = Date.now) && nativeNow;
  * @category Date
  * @example
  *
- * _.defer(function(stamp) { console.log(_.now() - stamp); }, _.now());
+ * _.defer(function(stamp) {
+ *   console.log(_.now() - stamp);
+ * }, _.now());
  * // => logs the number of milliseconds it took for the deferred function to be invoked
  */
 var now = nativeNow || function() {

function/bindAll.js

@@ -21,7 +21,9 @@ var baseBindAll = require('../internal/baseBindAll'),
  *
  * var view = {
  *   'label': 'docs',
- *   'onClick': function() { console.log('clicked ' + this.label); }
+ *   'onClick': function() {
+ *     console.log('clicked ' + this.label);
+ *   }
  * };
  *
  * _.bindAll(view);

function/debounce.js

@@ -26,7 +26,7 @@ var nativeMax = Math.max;
  * @memberOf _
  * @category Function
  * @param {Function} func The function to debounce.
- * @param {number} wait The number of milliseconds to delay.
+ * @param {number} [wait=0] The number of milliseconds to delay.
  * @param {Object} [options] The options object.
  * @param {boolean} [options.leading=false] Specify invoking on the leading
  *  edge of the timeout.
@@ -84,7 +84,7 @@ function debounce(func, wait, options) {
   if (typeof func != 'function') {
     throw new TypeError(FUNC_ERROR_TEXT);
   }
-  wait = wait < 0 ? 0 : wait;
+  wait = wait < 0 ? 0 : (+wait || 0);
   if (options === true) {
     var leading = true;
     trailing = false;

function/defer.js

@@ -12,7 +12,9 @@ var baseDelay = require('../internal/baseDelay');
  * @returns {number} Returns the timer id.
  * @example
  *
- * _.defer(function(text) { console.log(text); }, 'deferred');
+ * _.defer(function(text) {
+ *   console.log(text);
+ * }, 'deferred');
  * // logs 'deferred' after one or more milliseconds
  */
 function defer(func) {

function/delay.js

@@ -13,7 +13,9 @@ var baseDelay = require('../internal/baseDelay');
  * @returns {number} Returns the timer id.
  * @example
  *
- * _.delay(function(text) { console.log(text); }, 1000, 'later');
+ * _.delay(function(text) {
+ *   console.log(text);
+ * }, 1000, 'later');
  * // => logs 'later' after one second
  */
 function delay(func, wait) {

function/flow.js

@@ -1,8 +1,4 @@
-var arrayEvery = require('../internal/arrayEvery'),
-    isFunction = require('../lang/isFunction');
-
-/** Used as the `TypeError` message for "Functions" methods. */
-var FUNC_ERROR_TEXT = 'Expected a function';
+var createComposer = require('../internal/createComposer');
 
 /**
  * Creates a function that returns the result of invoking the provided
@@ -16,37 +12,14 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * @returns {Function} Returns the new function.
  * @example
  *
- * function add(x, y) {
- *   return x + y;
- * }
- *
  * function square(n) {
  *   return n * n;
  * }
  *
- * var addSquare = _.flow(add, square);
+ * var addSquare = _.flow(_.add, square);
  * addSquare(1, 2);
  * // => 9
  */
-function flow() {
-  var funcs = arguments,
-      length = funcs.length;
-
-  if (!length) {
-    return function() { return arguments[0]; };
-  }
-  if (!arrayEvery(funcs, isFunction)) {
-    throw new TypeError(FUNC_ERROR_TEXT);
-  }
-  return function() {
-    var index = 0,
-        result = funcs[index].apply(this, arguments);
-
-    while (++index < length) {
-      result = funcs[index].call(this, result);
-    }
-    return result;
-  };
-}
+var flow = createComposer();
 
 module.exports = flow;

function/flowRight.js

@@ -1,8 +1,4 @@
-var arrayEvery = require('../internal/arrayEvery'),
-    isFunction = require('../lang/isFunction');
-
-/** Used as the `TypeError` message for "Functions" methods. */
-var FUNC_ERROR_TEXT = 'Expected a function';
+var createComposer = require('../internal/createComposer');
 
 /**
  * This method is like `_.flow` except that it creates a function that
@@ -16,37 +12,14 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * @returns {Function} Returns the new function.
  * @example
  *
- * function add(x, y) {
- *   return x + y;
- * }
- *
  * function square(n) {
  *   return n * n;
  * }
  *
- * var addSquare = _.flowRight(square, add);
+ * var addSquare = _.flowRight(square, _.add);
  * addSquare(1, 2);
  * // => 9
  */
-function flowRight() {
-  var funcs = arguments,
-      fromIndex = funcs.length - 1;
-
-  if (fromIndex < 0) {
-    return function() { return arguments[0]; };
-  }
-  if (!arrayEvery(funcs, isFunction)) {
-    throw new TypeError(FUNC_ERROR_TEXT);
-  }
-  return function() {
-    var index = fromIndex,
-        result = funcs[index].apply(this, arguments);
-
-    while (index--) {
-      result = funcs[index].call(this, result);
-    }
-    return result;
-  };
-}
+var flowRight = createComposer(true);
 
 module.exports = flowRight;

function/memoize.js

@@ -61,13 +61,14 @@ function memoize(func, resolver) {
     throw new TypeError(FUNC_ERROR_TEXT);
   }
   var memoized = function() {
-    var cache = memoized.cache,
-        key = resolver ? resolver.apply(this, arguments) : arguments[0];
+    var args = arguments,
+        cache = memoized.cache,
+        key = resolver ? resolver.apply(this, args) : args[0];
 
     if (cache.has(key)) {
       return cache.get(key);
     }
-    var result = func.apply(this, arguments);
+    var result = func.apply(this, args);
     cache.set(key, result);
     return result;
   };

function/rearg.js

@@ -27,7 +27,9 @@ var REARG_FLAG = 128;
  * // => ['a', 'b', 'c']
  *
  * var map = _.rearg(_.map, [1, 0]);
- * map(function(n) { return n * 3; }, [1, 2, 3]);
+ * map(function(n) {
+ *   return n * 3;
+ * }, [1, 2, 3]);
  * // => [3, 6, 9]
  */
 function rearg(func) {

function/throttle.js

@@ -30,7 +30,7 @@ var debounceOptions = {
  * @memberOf _
  * @category Function
  * @param {Function} func The function to throttle.
- * @param {number} wait The number of milliseconds to throttle invocations to.
+ * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
  * @param {Object} [options] The options object.
  * @param {boolean} [options.leading=true] Specify invoking on the leading
  *  edge of the timeout.
@@ -43,8 +43,9 @@ var debounceOptions = {
  * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
  *
  * // invoke `renewToken` when the click event is fired, but not more than once every 5 minutes
- * var throttled =  _.throttle(renewToken, 300000, { 'trailing': false })
- * jQuery('.interactive').on('click', throttled);
+ * jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {
+ *   'trailing': false
+ * }));
  *
  * // cancel a trailing throttled call
  * jQuery(window).on('popstate', throttled.cancel);

internal/LazyWrapper.js

@@ -1,3 +1,6 @@
+var baseCreate = require('./baseCreate'),
+    baseLodash = require('./baseLodash');
+
 /** Used as references for `-Infinity` and `Infinity`. */
 var POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
 
@@ -18,4 +21,7 @@ function LazyWrapper(value) {
   this.__views__ = null;
 }
 
+LazyWrapper.prototype = baseCreate(baseLodash.prototype);
+LazyWrapper.prototype.constructor = LazyWrapper;
+
 module.exports = LazyWrapper;

internal/LodashWrapper.js

@@ -1,3 +1,6 @@
+var baseCreate = require('./baseCreate'),
+    baseLodash = require('./baseLodash');
+
 /**
  * The base constructor for creating `lodash` wrapper objects.
  *
@@ -12,4 +15,7 @@ function LodashWrapper(value, chainAll, actions) {
   this.__chain__ = !!chainAll;
 }
 
+LodashWrapper.prototype = baseCreate(baseLodash.prototype);
+LodashWrapper.prototype.constructor = LodashWrapper;
+
 module.exports = LodashWrapper;

internal/baseAssign.js

@@ -24,7 +24,7 @@ function baseAssign(object, source, customizer) {
         value = object[key],
         result = customizer(value, source[key], key, object, source);
 
-    if ((result === result ? result !== value : value === value) ||
+    if ((result === result ? (result !== value) : (value === value)) ||
         (typeof value == 'undefined' && !(key in object))) {
       object[key] = result;
     }

internal/baseDifference.js

@@ -21,7 +21,7 @@ function baseDifference(array, values) {
   var index = -1,
       indexOf = baseIndexOf,
       isCommon = true,
-      cache = isCommon && values.length >= 200 && createCache(values),
+      cache = (isCommon && values.length >= 200) ? createCache(values) : null,
       valuesLength = values.length;
 
   if (cache) {
@@ -42,7 +42,7 @@ function baseDifference(array, values) {
       }
       result.push(value);
     }
-    else if (indexOf(values, value) < 0) {
+    else if (indexOf(values, value, 0) < 0) {
       result.push(value);
     }
   }

internal/baseFill.js

@@ -19,7 +19,7 @@ function baseFill(array, value, start, end) {
   if (end < 0) {
     end += length;
   }
-  length = start > end ? 0 : end >>> 0;
+  length = start > end ? 0 : (end >>> 0);
   start >>>= 0;
 
   while (start < length) {

internal/baseFlatten.js

@@ -9,13 +9,13 @@ var isArguments = require('../lang/isArguments'),
  *
  * @private
  * @param {Array} array The array to flatten.
- * @param {boolean} [isDeep] Specify a deep flatten.
- * @param {boolean} [isStrict] Restrict flattening to arrays and `arguments` objects.
- * @param {number} [fromIndex=0] The index to start from.
+ * @param {boolean} isDeep Specify a deep flatten.
+ * @param {boolean} isStrict Restrict flattening to arrays and `arguments` objects.
+ * @param {number} fromIndex The index to start from.
  * @returns {Array} Returns the new flattened array.
  */
 function baseFlatten(array, isDeep, isStrict, fromIndex) {
-  var index = (fromIndex || 0) - 1,
+  var index = fromIndex - 1,
       length = array.length,
       resIndex = -1,
       result = [];
@@ -26,7 +26,7 @@ function baseFlatten(array, isDeep, isStrict, fromIndex) {
     if (isObjectLike(value) && isLength(value.length) && (isArray(value) || isArguments(value))) {
       if (isDeep) {
         // Recursively flatten arrays (susceptible to call stack limits).
-        value = baseFlatten(value, isDeep, isStrict);
+        value = baseFlatten(value, isDeep, isStrict, 0);
       }
       var valIndex = -1,
           valLength = value.length;

internal/baseIndexOf.js

@@ -6,14 +6,14 @@ var indexOfNaN = require('./indexOfNaN');
  * @private
  * @param {Array} array The array to search.
  * @param {*} value The value to search for.
- * @param {number} [fromIndex=0] The index to search from.
+ * @param {number} fromIndex The index to search from.
  * @returns {number} Returns the index of the matched value, else `-1`.
  */
 function baseIndexOf(array, value, fromIndex) {
   if (value !== value) {
     return indexOfNaN(array, fromIndex);
   }
-  var index = (fromIndex || 0) - 1,
+  var index = fromIndex - 1,
       length = array.length;
 
   while (++index < length) {

internal/baseIsFunction.js

@@ -0,0 +1,15 @@
+/**
+ * The base implementation of `_.isFunction` without support for environments
+ * with incorrect `typeof` results.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ */
+function baseIsFunction(value) {
+  // Avoid a Chakra JIT bug in compatibility modes of IE 11.
+  // See https://github.com/jashkenas/underscore/issues/1621 for more details.
+  return typeof value == 'function' || false;
+}
+
+module.exports = baseIsFunction;

internal/baseLodash.js

@@ -0,0 +1,10 @@
+/**
+ * The function whose prototype all chaining wrappers inherit from.
+ *
+ * @private
+ */
+function baseLodash() {
+  // No operation performed.
+}
+
+module.exports = baseLodash;

internal/baseMerge.js

@@ -3,6 +3,7 @@ var arrayEach = require('./arrayEach'),
     baseMergeDeep = require('./baseMergeDeep'),
     isArray = require('../lang/isArray'),
     isLength = require('./isLength'),
+    isObject = require('../lang/isObject'),
     isObjectLike = require('./isObjectLike'),
     isTypedArray = require('../lang/isTypedArray');
 
@@ -19,8 +20,10 @@ var arrayEach = require('./arrayEach'),
  * @returns {Object} Returns the destination object.
  */
 function baseMerge(object, source, customizer, stackA, stackB) {
+  if (!isObject(object)) {
+    return object;
+  }
   var isSrcArr = isLength(source.length) && (isArray(source) || isTypedArray(source));
-
   (isSrcArr ? arrayEach : baseForOwn)(source, function(srcValue, key, source) {
     if (isObjectLike(srcValue)) {
       stackA || (stackA = []);
@@ -35,7 +38,7 @@ function baseMerge(object, source, customizer, stackA, stackB) {
       result = srcValue;
     }
     if ((isSrcArr || typeof result != 'undefined') &&
-        (isCommon || (result === result ? result !== value : value === value))) {
+        (isCommon || (result === result ? (result !== value) : (value === value)))) {
       object[key] = result;
     }
   });

internal/baseMergeDeep.js

@@ -59,7 +59,7 @@ function baseMergeDeep(object, source, key, mergeFunc, customizer, stackA, stack
   if (isCommon) {
     // Recursively merge objects and arrays (susceptible to call stack limits).
     object[key] = mergeFunc(result, srcValue, customizer, stackA, stackB);
-  } else if (result === result ? result !== value : value === value) {
+  } else if (result === result ? (result !== value) : (value === value)) {
     object[key] = result;
   }
 }

internal/baseSlice.js

@@ -19,7 +19,7 @@ function baseSlice(array, start, end) {
   if (end < 0) {
     end += length;
   }
-  length = start > end ? 0 : (end - start) >>> 0;
+  length = start > end ? 0 : ((end - start) >>> 0);
   start >>>= 0;
 
   var result = Array(length);

internal/baseSortBy.js

@@ -1,6 +1,6 @@
 /**
- * The base implementation of `_.sortBy` and `_.sortByAll` which uses `comparer`
- * to define the sort order of `array` and replaces criteria objects with their
+ * The base implementation of `_.sortBy` which uses `comparer` to define
+ * the sort order of `array` and replaces criteria objects with their
  * corresponding values.
  *
  * @private

internal/baseSortByOrder.js

@@ -0,0 +1,35 @@
+var baseEach = require('./baseEach'),
+    baseSortBy = require('./baseSortBy'),
+    compareMultiple = require('./compareMultiple'),
+    isLength = require('./isLength');
+
+/**
+ * The base implementation of `_.sortByOrder` without param guards.
+ *
+ * @private
+ * @param {Array|Object|string} collection The collection to iterate over.
+ * @param {string[]} props The property names to sort by.
+ * @param {boolean[]} orders The sort orders of `props`.
+ * @returns {Array} Returns the new sorted array.
+ */
+function baseSortByOrder(collection, props, orders) {
+  var index = -1,
+      length = collection.length,
+      result = isLength(length) ? Array(length) : [];
+
+  baseEach(collection, function(value) {
+    var length = props.length,
+        criteria = Array(length);
+
+    while (length--) {
+      criteria[length] = value == null ? undefined : value[props[length]];
+    }
+    result[++index] = { 'criteria': criteria, 'index': index, 'value': value };
+  });
+
+  return baseSortBy(result, function(object, other) {
+    return compareMultiple(object, other, orders);
+  });
+}
+
+module.exports = baseSortByOrder;

internal/baseUniq.js

@@ -17,7 +17,7 @@ function baseUniq(array, iteratee) {
       length = array.length,
       isCommon = true,
       isLarge = isCommon && length >= 200,
-      seen = isLarge && createCache(),
+      seen = isLarge ? createCache() : null,
       result = [];
 
   if (seen) {
@@ -44,7 +44,7 @@ function baseUniq(array, iteratee) {
       }
       result.push(value);
     }
-    else if (indexOf(seen, computed) < 0) {
+    else if (indexOf(seen, computed, 0) < 0) {
       if (iteratee || isLarge) {
         seen.push(computed);
       }

internal/compareMultiple.js

@@ -1,24 +1,33 @@
 var baseCompareAscending = require('./baseCompareAscending');
 
 /**
- * Used by `_.sortByAll` to compare multiple properties of each element
- * in a collection and stable sort them in ascending order.
+ * Used by `_.sortByOrder` to compare multiple properties of each element
+ * in a collection and stable sort them in the following order:
+ *
+ * If orders is unspecified, sort in ascending order for all properties.
+ * Otherwise, for each property, sort in ascending order if its corresponding value in
+ * orders is true, and descending order if false.
  *
  * @private
  * @param {Object} object The object to compare to `other`.
  * @param {Object} other The object to compare to `object`.
+ * @param {boolean[]} orders The order to sort by for each property.
  * @returns {number} Returns the sort order indicator for `object`.
  */
-function compareMultipleAscending(object, other) {
+function compareMultiple(object, other, orders) {
   var index = -1,
       objCriteria = object.criteria,
       othCriteria = other.criteria,
-      length = objCriteria.length;
+      length = objCriteria.length,
+      ordersLength = orders.length;
 
   while (++index < length) {
     var result = baseCompareAscending(objCriteria[index], othCriteria[index]);
     if (result) {
-      return result;
+      if (index >= ordersLength) {
+        return result;
+      }
+      return result * (orders[index] ? 1 : -1);
     }
   }
   // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
@@ -31,4 +40,4 @@ function compareMultipleAscending(object, other) {
   return object.index - other.index;
 }
 
-module.exports = compareMultipleAscending;
+module.exports = compareMultiple;

internal/createAssigner.js

@@ -11,24 +11,31 @@ var bindCallback = require('./bindCallback'),
  */
 function createAssigner(assigner) {
   return function() {
-    var length = arguments.length,
-        object = arguments[0];
+    var args = arguments,
+        length = args.length,
+        object = args[0];
 
     if (length < 2 || object == null) {
       return object;
     }
-    if (length > 3 && isIterateeCall(arguments[1], arguments[2], arguments[3])) {
-      length = 2;
+    var customizer = args[length - 2],
+        thisArg = args[length - 1],
+        guard = args[3];
+
+    if (length > 3 && typeof customizer == 'function') {
+      customizer = bindCallback(customizer, thisArg, 5);
+      length -= 2;
+    } else {
+      customizer = (length > 2 && typeof thisArg == 'function') ? thisArg : null;
+      length -= (customizer ? 1 : 0);
     }
-    // Juggle arguments.
-    if (length > 3 && typeof arguments[length - 2] == 'function') {
-      var customizer = bindCallback(arguments[--length - 1], arguments[length--], 5);
-    } else if (length > 2 && typeof arguments[length - 1] == 'function') {
-      customizer = arguments[--length];
+    if (guard && isIterateeCall(args[1], args[2], guard)) {
+      customizer = length == 3 ? null : customizer;
+      length = 2;
     }
     var index = 0;
     while (++index < length) {
-      var source = arguments[index];
+      var source = args[index];
       if (source) {
         assigner(object, source, customizer);
       }

internal/createBindWrapper.js

@@ -13,7 +13,8 @@ function createBindWrapper(func, thisArg) {
   var Ctor = createCtorWrapper(func);
 
   function wrapper() {
-    return (this instanceof wrapper ? Ctor : func).apply(thisArg, arguments);
+    var fn = (this && this !== global && this instanceof wrapper) ? Ctor : func;
+    return fn.apply(thisArg, arguments);
   }
   return wrapper;
 }

internal/createComposer.js

@@ -0,0 +1,39 @@
+/** Used as the `TypeError` message for "Functions" methods. */
+var FUNC_ERROR_TEXT = 'Expected a function';
+
+/**
+ * Creates a function to compose other functions into a single function.
+ *
+ * @private
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {Function} Returns the new composer function.
+ */
+function createComposer(fromRight) {
+  return function() {
+    var length = arguments.length,
+        index = length,
+        fromIndex = fromRight ? (length - 1) : 0;
+
+    if (!length) {
+      return function() { return arguments[0]; };
+    }
+    var funcs = Array(length);
+    while (index--) {
+      funcs[index] = arguments[index];
+      if (typeof funcs[index] != 'function') {
+        throw new TypeError(FUNC_ERROR_TEXT);
+      }
+    }
+    return function() {
+      var index = fromIndex,
+          result = funcs[index].apply(this, arguments);
+
+      while ((fromRight ? index-- : ++index < length)) {
+        result = funcs[index].call(this, result);
+      }
+      return result;
+    };
+  };
+}
+
+module.exports = createComposer;

internal/createHybridWrapper.js

@@ -96,7 +96,8 @@ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partials
     if (isAry && ary < args.length) {
       args.length = ary;
     }
-    return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args);
+    var fn = (this && this !== global && this instanceof wrapper) ? (Ctor || createCtorWrapper(func)) : func;
+    return fn.apply(thisBinding, args);
   }
   return wrapper;
 }

internal/createPartialWrapper.js

@@ -34,7 +34,8 @@ function createPartialWrapper(func, bitmask, thisArg, partials) {
     while (argsLength--) {
       args[leftIndex++] = arguments[++argsIndex];
     }
-    return (this instanceof wrapper ? Ctor : func).apply(isBind ? thisArg : this, args);
+    var fn = (this && this !== global && this instanceof wrapper) ? Ctor : func;
+    return fn.apply(isBind ? thisArg : this, args);
   }
   return wrapper;
 }

internal/equalObjects.js

@@ -61,8 +61,10 @@ function equalObjects(object, other, equalFunc, customizer, isWhere, stackA, sta
         othCtor = other.constructor;
 
     // Non `Object` object instances with different constructors are not equal.
-    if (objCtor != othCtor && ('constructor' in object && 'constructor' in other) &&
-        !(typeof objCtor == 'function' && objCtor instanceof objCtor && typeof othCtor == 'function' && othCtor instanceof othCtor)) {
+    if (objCtor != othCtor &&
+        ('constructor' in object && 'constructor' in other) &&
+        !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
+          typeof othCtor == 'function' && othCtor instanceof othCtor)) {
       return false;
     }
   }

internal/extremumBy.js

@@ -23,7 +23,8 @@ function extremumBy(collection, iteratee, isMin) {
 
   baseEach(collection, function(value, index, collection) {
     var current = iteratee(value, index, collection);
-    if ((isMin ? current < computed : current > computed) || (current === exValue && current === result)) {
+    if ((isMin ? (current < computed) : (current > computed)) ||
+        (current === exValue && current === result)) {
       computed = current;
       result = value;
     }

internal/indexOfNaN.js

@@ -4,13 +4,13 @@
  *
  * @private
  * @param {Array} array The array to search.
- * @param {number} [fromIndex] The index to search from.
+ * @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 `NaN`, else `-1`.
  */
 function indexOfNaN(array, fromIndex, fromRight) {
   var length = array.length,
-      index = fromRight ? (fromIndex || length) : ((fromIndex || 0) - 1);
+      index = fromIndex + (fromRight ? 0 : -1);
 
   while ((fromRight ? index-- : ++index < length)) {
     var other = array[index];

internal/isIterateeCall.js

@@ -22,7 +22,11 @@ function isIterateeCall(value, index, object) {
   } else {
     prereq = type == 'string' && index in object;
   }
-  return prereq && object[index] === value;
+  if (prereq) {
+    var other = object[index];
+    return value === value ? (value === other) : (other !== other);
+  }
+  return false;
 }
 
 module.exports = isIterateeCall;

internal/lazyClone.js

@@ -17,7 +17,6 @@ function lazyClone() {
 
   result.__actions__ = actions ? arrayCopy(actions) : null;
   result.__dir__ = this.__dir__;
-  result.__dropCount__ = this.__dropCount__;
   result.__filtered__ = this.__filtered__;
   result.__iteratees__ = iteratees ? arrayCopy(iteratees) : null;
   result.__takeCount__ = this.__takeCount__;

internal/lazyValue.js

@@ -3,8 +3,9 @@ var baseWrapperValue = require('./baseWrapperValue'),
     isArray = require('../lang/isArray');
 
 /** Used to indicate the type of lazy iteratees. */
-var LAZY_FILTER_FLAG = 0,
-    LAZY_MAP_FLAG = 1;
+var LAZY_DROP_WHILE_FLAG = 0,
+    LAZY_FILTER_FLAG = 1,
+    LAZY_MAP_FLAG = 2;
 
 /* Native method references for those with the same name as other `lodash` methods. */
 var nativeMin = Math.min;
@@ -28,9 +29,8 @@ function lazyValue() {
       start = view.start,
       end = view.end,
       length = end - start,
-      dropCount = this.__dropCount__,
+      index = isRight ? end : (start - 1),
       takeCount = nativeMin(length, this.__takeCount__),
-      index = isRight ? end : start - 1,
       iteratees = this.__iteratees__,
       iterLength = iteratees ? iteratees.length : 0,
       resIndex = 0,
@@ -46,24 +46,34 @@ function lazyValue() {
     while (++iterIndex < iterLength) {
       var data = iteratees[iterIndex],
           iteratee = data.iteratee,
-          computed = iteratee(value, index, array),
           type = data.type;
 
-      if (type == LAZY_MAP_FLAG) {
-        value = computed;
-      } else if (!computed) {
-        if (type == LAZY_FILTER_FLAG) {
-          continue outer;
-        } else {
-          break outer;
+      if (type == LAZY_DROP_WHILE_FLAG) {
+        if (data.done && (isRight ? (index > data.index) : (index < data.index))) {
+          data.count = 0;
+          data.done = false;
+        }
+        data.index = index;
+        if (!data.done) {
+          var limit = data.limit;
+          if (!(data.done = limit > -1 ? (data.count++ >= limit) : !iteratee(value))) {
+            continue outer;
+          }
+        }
+      } else {
+        var computed = iteratee(value);
+        if (type == LAZY_MAP_FLAG) {
+          value = computed;
+        } else if (!computed) {
+          if (type == LAZY_FILTER_FLAG) {
+            continue outer;
+          } else {
+            break outer;
+          }
         }
       }
     }
-    if (dropCount) {
-      dropCount--;
-    } else {
-      result[resIndex++] = value;
-    }
+    result[resIndex++] = value;
   }
   return result;
 }

lang/clone.js

@@ -40,22 +40,26 @@ var baseClone = require('../internal/baseClone'),
  * // => false
  *
  * // using a customizer callback
- * var body = _.clone(document.body, function(value) {
- *   return _.isElement(value) ? value.cloneNode(false) : undefined;
+ * var el = _.clone(document.body, function(value) {
+ *   if (_.isElement(value)) {
+ *     return value.cloneNode(false);
+ *   }
  * });
  *
- * body === document.body
+ * el === document.body
  * // => false
- * body.nodeName
+ * el.nodeName
  * // => BODY
- * body.childNodes.length;
+ * el.childNodes.length;
  * // => 0
  */
 function clone(value, isDeep, customizer, thisArg) {
-  // Juggle arguments.
-  if (typeof isDeep != 'boolean' && isDeep != null) {
+  if (isDeep && typeof isDeep != 'boolean' && isIterateeCall(value, isDeep, customizer)) {
+    isDeep = false;
+  }
+  else if (typeof isDeep == 'function') {
     thisArg = customizer;
-    customizer = isIterateeCall(value, isDeep, thisArg) ? null : isDeep;
+    customizer = isDeep;
     isDeep = false;
   }
   customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 1);

lang/cloneDeep.js

@@ -34,14 +34,16 @@ var baseClone = require('../internal/baseClone'),
  *
  * // using a customizer callback
  * var el = _.cloneDeep(document.body, function(value) {
- *   return _.isElement(value) ? value.cloneNode(true) : undefined;
+ *   if (_.isElement(value)) {
+ *     return value.cloneNode(true);
+ *   }
  * });
  *
- * body === document.body
+ * el === document.body
  * // => false
- * body.nodeName
+ * el.nodeName
  * // => BODY
- * body.childNodes.length;
+ * el.childNodes.length;
  * // => 20
  */
 function cloneDeep(value, customizer, thisArg) {

lang/isArguments.js

@@ -24,7 +24,7 @@ var objToString = objectProto.toString;
  * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
  * @example
  *
- * (function() { return _.isArguments(arguments); })();
+ * _.isArguments(function() { return arguments; }());
  * // => true
  *
  * _.isArguments([1, 2, 3]);

lang/isArray.js

@@ -31,7 +31,7 @@ var nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray;
  * _.isArray([1, 2, 3]);
  * // => true
  *
- * (function() { return _.isArray(arguments); })();
+ * _.isArray(function() { return arguments; }());
  * // => false
  */
 var isArray = nativeIsArray || function(value) {

lang/isElement.js

@@ -30,7 +30,7 @@ var objToString = objectProto.toString;
  */
 function isElement(value) {
   return (value && value.nodeType === 1 && isObjectLike(value) &&
-    objToString.call(value).indexOf('Element') > -1) || false;
+    (objToString.call(value).indexOf('Element') > -1)) || false;
 }
 // Fallback for environments without DOM support.
 if (!support.dom) {

lang/isEmpty.js

@@ -7,7 +7,7 @@ var isArguments = require('./isArguments'),
     keys = require('../object/keys');
 
 /**
- * Checks if a value is empty. A value is considered empty unless it is an
+ * Checks if `value` is empty. A value is considered empty unless it is an
  * `arguments` object, array, string, or jQuery-like collection with a length
  * greater than `0` or an object with own enumerable properties.
  *

lang/isEqual.js

@@ -39,7 +39,9 @@ var baseIsEqual = require('../internal/baseIsEqual'),
  * var other = ['hi', 'goodbye'];
  *
  * _.isEqual(array, other, function(value, other) {
- *   return _.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/) || undefined;
+ *   if (_.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/)) {
+ *     return true;
+ *   }
  * });
  * // => true
  */

lang/isFunction.js

@@ -1,4 +1,5 @@
-var isNative = require('./isNative');
+var baseIsFunction = require('../internal/baseIsFunction'),
+    isNative = require('./isNative');
 
 /** `Object#toString` result references. */
 var funcTag = '[object Function]';
@@ -32,19 +33,11 @@ var Uint8Array = isNative(Uint8Array = global.Uint8Array) && Uint8Array;
  * _.isFunction(/abc/);
  * // => false
  */
-function isFunction(value) {
-  // Avoid a Chakra JIT bug in compatibility modes of IE 11.
-  // See https://github.com/jashkenas/underscore/issues/1621 for more details.
-  return typeof value == 'function' || false;
-}
-// Fallback for environments that return incorrect `typeof` operator results.
-if (isFunction(/x/) || (Uint8Array && !isFunction(Uint8Array))) {
-  isFunction = function(value) {
-    // The use of `Object#toString` avoids issues with the `typeof` operator
-    // in older versions of Chrome and Safari which return 'function' for regexes
-    // and Safari 8 equivalents which return 'object' for typed array constructors.
-    return objToString.call(value) == funcTag;
-  };
-}
+var isFunction = !(baseIsFunction(/x/) || (Uint8Array && !baseIsFunction(Uint8Array))) ? baseIsFunction : function(value) {
+  // The use of `Object#toString` avoids issues with the `typeof` operator
+  // in older versions of Chrome and Safari which return 'function' for regexes
+  // and Safari 8 equivalents which return 'object' for typed array constructors.
+  return objToString.call(value) == funcTag;
+};
 
 module.exports = isFunction;

lang/toArray.js

@@ -12,7 +12,9 @@ var arrayCopy = require('../internal/arrayCopy'),
  * @returns {Array} Returns the converted array.
  * @example
  *
- * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3);
+ * (function() {
+ *   return _.toArray(arguments).slice(1);
+ * }(1, 2, 3));
  * // => [2, 3]
  */
 function toArray(value) {

math.js

@@ -0,0 +1,6 @@
+module.exports = {
+  'add': require('./math/add'),
+  'max': require('./math/max'),
+  'min': require('./math/min'),
+  'sum': require('./math/sum')
+};

math/add.js

@@ -0,0 +1,19 @@
+/**
+ * Adds two numbers.
+ *
+ * @static
+ * @memberOf _
+ * @category Math
+ * @param {number} augend The first number to add.
+ * @param {number} addend The second number to add.
+ * @returns {number} Returns the sum.
+ * @example
+ *
+ * _.add(6, 4);
+ * // => 10
+ */
+function add(augend, addend) {
+  return augend + addend;
+}
+
+module.exports = add;