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-es v3.0.1
+# lodash-es v3.5.0
 
 The [modern build](https://github.com/lodash/lodash/wiki/Build-Differences) of [lodash](https://lodash.com/) exported as [ES](https://people.mozilla.org/~jorendorff/es6-draft.html) modules.
 
@@ -6,3 +6,5 @@ Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
 ```bash
 $ lodash modularize modern exports=es -o ./
 ```
+
+See the [package source](https://github.com/lodash/lodash/tree/3.5.0-es) for more details.

array.js

@@ -5,6 +5,7 @@ import drop from './array/drop';
 import dropRight from './array/dropRight';
 import dropRightWhile from './array/dropRightWhile';
 import dropWhile from './array/dropWhile';
+import fill from './array/fill';
 import findIndex from './array/findIndex';
 import findLastIndex from './array/findLastIndex';
 import first from './array/first';
@@ -46,6 +47,7 @@ export default {
   'dropRight': dropRight,
   'dropRightWhile': dropRightWhile,
   'dropWhile': dropWhile,
+  'fill': fill,
   'findIndex': findIndex,
   'findLastIndex': findLastIndex,
   'first': first,

array/chunk.js

@@ -16,7 +16,7 @@ var nativeMax = Math.max;
  * @memberOf _
  * @category Array
  * @param {Array} array The array to process.
- * @param {numer} [size=1] The length of each chunk.
+ * @param {number} [size=1] The length of each chunk.
  * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
  * @returns {Array} Returns the new array containing chunks.
  * @example

array/difference.js

@@ -20,20 +20,21 @@ import isArray from '../lang/isArray';
  * @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));
 }
 
 export default difference;

array/drop.js

@@ -6,7 +6,6 @@ import isIterateeCall from '../internal/isIterateeCall';
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {number} [n=1] The number of elements to drop.

array/dropRight.js

@@ -6,7 +6,6 @@ import isIterateeCall from '../internal/isIterateeCall';
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {number} [n=1] The number of elements to drop.

array/dropRightWhile.js

@@ -6,40 +6,49 @@ import baseSlice from '../internal/baseSlice';
  * Elements are dropped until `predicate` returns falsey. The predicate is
  * bound to `thisArg` and invoked with three arguments; (value, index, array).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
- * callback returns `true` for elements that have the properties of the given
+ * 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 match the properties of the given
  * object, else `false`.
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per element.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @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 = [
- *   { 'user': 'barney',  'status': 'busy', 'active': false },
- *   { 'user': 'fred',    'status': 'busy', 'active': true },
- *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ *   { 'user': 'barney',  'active': true },
+ *   { 'user': 'fred',    'active': false },
+ *   { 'user': 'pebbles', 'active': false }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.pluck(_.dropRightWhile(users, 'active'), 'user');
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.dropRightWhile(users, { 'user': 'pebbles', 'active': false }), 'user');
+ * // => ['barney', 'fred']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.dropRightWhile(users, 'active', false), 'user');
  * // => ['barney']
  *
- * // using the "_.matches" callback shorthand
- * _.pluck(_.dropRightWhile(users, { 'status': 'away' }), 'user');
- * // => ['barney', 'fred']
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.dropRightWhile(users, 'active'), 'user');
+ * // => ['barney', 'fred', 'pebbles']
  */
 function dropRightWhile(array, predicate, thisArg) {
   var length = array ? array.length : 0;

array/dropWhile.js

@@ -6,40 +6,49 @@ import baseSlice from '../internal/baseSlice';
  * Elements are dropped until `predicate` returns falsey. The predicate is
  * bound to `thisArg` and invoked with three arguments; (value, index, array).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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 _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per element.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @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 = [
- *   { 'user': 'barney',  'status': 'busy', 'active': true },
- *   { 'user': 'fred',    'status': 'busy', 'active': false },
- *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ *   { 'user': 'barney',  'active': false },
+ *   { 'user': 'fred',    'active': false },
+ *   { 'user': 'pebbles', 'active': true }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.pluck(_.dropWhile(users, 'active'), 'user');
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.dropWhile(users, { 'user': 'barney', 'active': false }), 'user');
  * // => ['fred', 'pebbles']
  *
- * // using the "_.matches" callback shorthand
- * _.pluck(_.dropWhile(users, { 'status': 'busy' }), 'user');
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.dropWhile(users, 'active', false), 'user');
  * // => ['pebbles']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.dropWhile(users, 'active'), 'user');
+ * // => ['barney', 'fred', 'pebbles']
  */
 function dropWhile(array, predicate, thisArg) {
   var length = array ? array.length : 0;

array/fill.js

@@ -0,0 +1,31 @@
+import baseFill from '../internal/baseFill';
+import isIterateeCall from '../internal/isIterateeCall';
+
+/**
+ * Fills elements of `array` with `value` from `start` up to, but not
+ * including, `end`.
+ *
+ * **Note:** This method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill `array` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns `array`.
+ */
+function fill(array, value, start, end) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
+    start = 0;
+    end = length;
+  }
+  return baseFill(array, value, start, end);
+}
+
+export default fill;

array/findIndex.js

@@ -4,10 +4,14 @@ import baseCallback from '../internal/baseCallback';
  * This method is like `_.find` except that it returns the index of the first
  * element `predicate` returns truthy for, instead of the element itself.
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -16,28 +20,33 @@ import baseCallback from '../internal/baseCallback';
  * @category Array
  * @param {Array} array The array to search.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {number} Returns the index of the found element, else `-1`.
  * @example
  *
  * var users = [
- *   { 'user': 'barney',  'age': 36, 'active': false },
- *   { 'user': 'fred',    'age': 40, 'active': true },
- *   { 'user': 'pebbles', 'age': 1,  'active': false }
+ *   { 'user': 'barney',  'active': false },
+ *   { 'user': 'fred',    'active': false },
+ *   { 'user': 'pebbles', 'active': true }
  * ];
  *
- * _.findIndex(users, function(chr) { return chr.age < 40; });
+ * _.findIndex(users, function(chr) {
+ *   return chr.user == 'barney';
+ * });
  * // => 0
  *
- * // using the "_.matches" callback shorthand
- * _.findIndex(users, { 'age': 1 });
- * // => 2
- *
- * // using the "_.property" callback shorthand
- * _.findIndex(users, 'active');
+ * // using the `_.matches` callback shorthand
+ * _.findIndex(users, { 'user': 'fred', 'active': false });
  * // => 1
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.findIndex(users, 'active', false);
+ * // => 0
+ *
+ * // using the `_.property` callback shorthand
+ * _.findIndex(users, 'active');
+ * // => 2
  */
 function findIndex(array, predicate, thisArg) {
   var index = -1,

array/findLastIndex.js

@@ -4,10 +4,14 @@ import baseCallback from '../internal/baseCallback';
  * This method is like `_.findIndex` except that it iterates over elements
  * of `collection` from right to left.
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -16,26 +20,31 @@ import baseCallback from '../internal/baseCallback';
  * @category Array
  * @param {Array} array The array to search.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {number} Returns the index of the found element, else `-1`.
  * @example
  *
  * var users = [
- *   { 'user': 'barney',  'age': 36, 'active': true },
- *   { 'user': 'fred',    'age': 40, 'active': false },
- *   { 'user': 'pebbles', 'age': 1,  'active': false }
+ *   { 'user': 'barney',  'active': true },
+ *   { 'user': 'fred',    'active': false },
+ *   { 'user': 'pebbles', 'active': false }
  * ];
  *
- * _.findLastIndex(users, function(chr) { return chr.age < 40; });
+ * _.findLastIndex(users, function(chr) {
+ *   return chr.user == 'pebbles';
+ * });
  * // => 2
  *
- * // using the "_.matches" callback shorthand
- * _.findLastIndex(users, { 'age': 40 });
- * // => 1
+ * // using the `_.matches` callback shorthand
+ * _.findLastIndex(users, { 'user': 'barney', 'active': true });
+ * // => 0
  *
- * // using the "_.property" callback shorthand
+ * // using the `_.matchesProperty` callback shorthand
+ * _.findLastIndex(users, 'active', false);
+ * // => 2
+ *
+ * // using the `_.property` callback shorthand
  * _.findLastIndex(users, 'active');
  * // => 0
  */

array/flatten.js

@@ -14,11 +14,11 @@ import isIterateeCall from '../internal/isIterateeCall';
  * @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) : [];
 }
 
 export default flatten;

array/flattenDeep.js

@@ -10,12 +10,12 @@ import baseFlatten from '../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) : [];
 }
 
 export default 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);
 }
 
 export default indexOf;

array/intersection.js

@@ -19,9 +19,8 @@ import isArray from '../lang/isArray';
  * @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 @@ import basePullAt from '../internal/basePullAt';
  * @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

@@ -11,10 +11,14 @@ var splice = arrayProto.splice;
  * and returns an array of the removed elements. The predicate is bound to
  * `thisArg` and invoked with three arguments; (value, index, array).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -25,14 +29,15 @@ var splice = arrayProto.splice;
  * @category Array
  * @param {Array} array The array to modify.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {Array} Returns the new array of removed elements.
  * @example
  *
  * var array = [1, 2, 3, 4];
- * var evens = _.remove(array, function(n) { return n % 2 == 0; });
+ * var evens = _.remove(array, function(n) {
+ *   return n % 2 == 0;
+ * });
  *
  * console.log(array);
  * // => [1, 3]

array/sortedIndex.js

@@ -9,10 +9,14 @@ import binaryIndexBy from '../internal/binaryIndexBy';
  * to compute their sort ranking. The iteratee is bound to `thisArg` and
  * invoked with one argument; (value).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -22,8 +26,7 @@ import binaryIndexBy from '../internal/binaryIndexBy';
  * @param {Array} array The sorted array to inspect.
  * @param {*} value The value to evaluate.
  * @param {Function|Object|string} [iteratee=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {number} Returns the index at which `value` should be inserted
  *  into `array`.
@@ -32,7 +35,7 @@ import binaryIndexBy from '../internal/binaryIndexBy';
  * _.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 } };
@@ -43,7 +46,7 @@ import binaryIndexBy from '../internal/binaryIndexBy';
  * }, dict);
  * // => 1
  *
- * // using the "_.property" callback shorthand
+ * // using the `_.property` callback shorthand
  * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
  * // => 1
  */

array/sortedLastIndex.js

@@ -13,14 +13,13 @@ import binaryIndexBy from '../internal/binaryIndexBy';
  * @param {Array} array The sorted array to inspect.
  * @param {*} value The value to evaluate.
  * @param {Function|Object|string} [iteratee=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {number} Returns the index at which `value` should be inserted
  *  into `array`.
  * @example
  *
- * _.sortedLastIndex([4, 4, 5, 5, 6, 6], 5);
+ * _.sortedLastIndex([4, 4, 5, 5], 5);
  * // => 4
  */
 function sortedLastIndex(array, value, iteratee, thisArg) {

array/take.js

@@ -6,7 +6,6 @@ import isIterateeCall from '../internal/isIterateeCall';
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {number} [n=1] The number of elements to take.

array/takeRight.js

@@ -6,7 +6,6 @@ import isIterateeCall from '../internal/isIterateeCall';
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {number} [n=1] The number of elements to take.

array/takeRightWhile.js

@@ -6,40 +6,49 @@ import baseSlice from '../internal/baseSlice';
  * taken until `predicate` returns falsey. The predicate is bound to `thisArg`
  * and invoked with three arguments; (value, index, array).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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 _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per element.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @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 = [
- *   { 'user': 'barney',  'status': 'busy', 'active': false },
- *   { 'user': 'fred',    'status': 'busy', 'active': true },
- *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ *   { 'user': 'barney',  'active': true },
+ *   { 'user': 'fred',    'active': false },
+ *   { 'user': 'pebbles', 'active': false }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.pluck(_.takeRightWhile(users, 'active'), 'user');
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.takeRightWhile(users, { 'user': 'pebbles', 'active': false }), 'user');
+ * // => ['pebbles']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.takeRightWhile(users, 'active', false), 'user');
  * // => ['fred', 'pebbles']
  *
- * // using the "_.matches" callback shorthand
- * _.pluck(_.takeRightWhile(users, { 'status': 'away' }), 'user');
- * // => ['pebbles']
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.takeRightWhile(users, 'active'), 'user');
+ * // => []
  */
 function takeRightWhile(array, predicate, thisArg) {
   var length = array ? array.length : 0;

array/takeWhile.js

@@ -6,40 +6,49 @@ import baseSlice from '../internal/baseSlice';
  * are taken until `predicate` returns falsey. The predicate is bound to
  * `thisArg` and invoked with three arguments; (value, index, array).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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 _
- * @type Function
  * @category Array
  * @param {Array} array The array to query.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per element.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @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 = [
- *   { 'user': 'barney',  'status': 'busy', 'active': true },
- *   { 'user': 'fred',    'status': 'busy', 'active': false },
- *   { 'user': 'pebbles', 'status': 'away', 'active': true }
+ *   { 'user': 'barney',  'active': false },
+ *   { 'user': 'fred',    'active': false},
+ *   { 'user': 'pebbles', 'active': true }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.pluck(_.takeWhile(users, 'active'), 'user');
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.takeWhile(users, { 'user': 'barney', 'active': false }), 'user');
  * // => ['barney']
  *
- * // using the "_.matches" callback shorthand
- * _.pluck(_.takeWhile(users, { 'status': 'busy' }), 'user');
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.takeWhile(users, 'active', false), 'user');
  * // => ['barney', 'fred']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.takeWhile(users, 'active'), 'user');
+ * // => []
  */
 function takeWhile(array, predicate, thisArg) {
   var length = array ? array.length : 0;

array/union.js

@@ -17,11 +17,11 @@ import baseUniq from '../internal/baseUniq';
  * @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));
 }
 
 export default union;

array/uniq.js

@@ -11,10 +11,14 @@ import sortedUniq from '../internal/sortedUniq';
  * uniqueness is computed. The `iteratee` is bound to `thisArg` and invoked
  * with three arguments; (value, index, array).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -30,8 +34,6 @@ import sortedUniq from '../internal/sortedUniq';
  * @param {Array} array The array to inspect.
  * @param {boolean} [isSorted] Specify the array is sorted.
  * @param {Function|Object|string} [iteratee] The function invoked per iteration.
- *  If a property name or object is provided it is used to create a "_.property"
- *  or "_.matches" style callback respectively.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {Array} Returns the new duplicate-value-free array.
  * @example
@@ -44,10 +46,12 @@ import sortedUniq from '../internal/sortedUniq';
  * // => [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
+ * // using the `_.property` callback shorthand
  * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
  * // => [{ 'x': 1 }, { 'x': 2 }]
  */
@@ -56,8 +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 @@ import baseSlice from '../internal/baseSlice';
  * @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 @@ import isArray from '../lang/isArray';
  * @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.js

@@ -1,6 +1,9 @@
 import chain from './chain/chain';
+import commit from './chain/commit';
 import lodash from './chain/lodash';
+import plant from './chain/plant';
 import reverse from './chain/reverse';
+import run from './chain/run';
 import tap from './chain/tap';
 import thru from './chain/thru';
 import toJSON from './chain/toJSON';
@@ -11,8 +14,11 @@ import wrapperChain from './chain/wrapperChain';
 
 export default {
   'chain': chain,
+  'commit': commit,
   'lodash': lodash,
+  'plant': plant,
   'reverse': reverse,
+  'run': run,
   'tap': tap,
   'thru': thru,
   'toJSON': toJSON,

chain/chain.js

@@ -8,7 +8,7 @@ import lodash from './lodash';
  * @memberOf _
  * @category Chain
  * @param {*} value The value to wrap.
- * @returns {Object} Returns the new `lodash` object.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
  * @example
  *
  * var users = [
@@ -19,7 +19,9 @@ import lodash from './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/commit.js

@@ -0,0 +1,2 @@
+import wrapperCommit from './wrapperCommit'
+export default wrapperCommit;

chain/lodash.js

@@ -1,7 +1,9 @@
+import LazyWrapper from '../internal/LazyWrapper';
 import LodashWrapper from '../internal/LodashWrapper';
-import arrayCopy from '../internal/arrayCopy';
+import baseLodash from '../internal/baseLodash';
 import isArray from '../lang/isArray';
 import isObjectLike from '../internal/isObjectLike';
+import wrapperClone from '../internal/wrapperClone';
 
 /** Used for native method references. */
 var objectProto = Object.prototype;
@@ -10,7 +12,7 @@ var objectProto = Object.prototype;
 var hasOwnProperty = objectProto.hasOwnProperty;
 
 /**
- * Creates a `lodash` object which wraps `value` to enable intuitive chaining.
+ * Creates a `lodash` object which wraps `value` to enable implicit chaining.
  * Methods that operate on and return arrays, collections, and functions can
  * be chained together. Methods that return a boolean or single value will
  * automatically end the chain returning the unwrapped value. Explicit chaining
@@ -25,65 +27,76 @@ 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 functions that support shortcut fusion are:
- * `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`, `first`,
- * `initial`, `last`, `map`, `pluck`, `reject`, `rest`, `reverse`, `slice`,
- * `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `where`
+ * The wrapper `Array` methods are:
+ * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`,
+ * `splice`, and `unshift`
  *
- * The chainable wrapper functions are:
+ * The wrapper `String` methods are:
+ * `replace` and `split`
+ *
+ * The wrapper methods that support shortcut fusion are:
+ * `compact`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`,
+ * `first`, `initial`, `last`, `map`, `pluck`, `reject`, `rest`, `reverse`,
+ * `slice`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `toArray`,
+ * and `where`
+ *
+ * The chainable wrapper methods are:
  * `after`, `ary`, `assign`, `at`, `before`, `bind`, `bindAll`, `bindKey`,
- * `callback`, `chain`, `chunk`, `compact`, `concat`, `constant`, `countBy`,
- * `create`, `curry`, `debounce`, `defaults`, `defer`, `delay`, `difference`,
- * `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`, `flatten`,
- * `flattenDeep`, `flow`, `flowRight`, `forEach`, `forEachRight`, `forIn`,
- * `forInRight`, `forOwn`, `forOwnRight`, `functions`, `groupBy`, `indexBy`,
- * `initial`, `intersection`, `invert`, `invoke`, `keys`, `keysIn`, `map`,
- * `mapValues`, `matches`, `memoize`, `merge`, `mixin`, `negate`, `noop`,
- * `omit`, `once`, `pairs`, `partial`, `partialRight`, `partition`, `pick`,
- * `pluck`, `property`, `propertyOf`, `pull`, `pullAt`, `push`, `range`,
- * `rearg`, `reject`, `remove`, `rest`, `reverse`, `shuffle`, `slice`, `sort`,
- * `sortBy`, `sortByAll`, `splice`, `take`, `takeRight`, `takeRightWhile`,
- * `takeWhile`, `tap`, `throttle`, `thru`, `times`, `toArray`, `toPlainObject`,
- * `transform`, `union`, `uniq`, `unshift`, `unzip`, `values`, `valuesIn`,
- * `where`, `without`, `wrap`, `xor`, `zip`, and `zipObject`
+ * `callback`, `chain`, `chunk`, `commit`, `compact`, `concat`, `constant`,
+ * `countBy`, `create`, `curry`, `debounce`, `defaults`, `defer`, `delay`,
+ * `difference`, `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `fill`,
+ * `filter`, `flatten`, `flattenDeep`, `flow`, `flowRight`, `forEach`,
+ * `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `functions`,
+ * `groupBy`, `indexBy`, `initial`, `intersection`, `invert`, `invoke`, `keys`,
+ * `keysIn`, `map`, `mapValues`, `matches`, `matchesProperty`, `memoize`, `merge`,
+ * `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`, `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 functions that are **not** chainable by default are:
- * `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `deburr`,
+ * The wrapper methods that are **not** chainable by default are:
+ * `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`,
- * `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 function `sample` will return a wrapped value when `n` is provided,
+ * The wrapper method `sample` will return a wrapped value when `n` is provided,
  * otherwise an unwrapped value is returned.
  *
  * @name _
  * @constructor
  * @category Chain
  * @param {*} value The value to wrap in a `lodash` instance.
- * @returns {Object} Returns a `lodash` instance.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
  * @example
  *
  * 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
@@ -92,18 +105,18 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * // => true
  */
 function lodash(value) {
-  if (isObjectLike(value) && !isArray(value)) {
+  if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
     if (value instanceof LodashWrapper) {
       return value;
     }
-    if (hasOwnProperty.call(value, '__wrapped__')) {
-      return new LodashWrapper(value.__wrapped__, value.__chain__, arrayCopy(value.__actions__));
+    if (hasOwnProperty.call(value, '__chain__') && hasOwnProperty.call(value, '__wrapped__')) {
+      return wrapperClone(value);
     }
   }
   return new LodashWrapper(value);
 }
 
-// Ensure `new LodashWrapper` is an instance of `lodash`.
-LodashWrapper.prototype = lodash.prototype;
+// Ensure wrappers are instances of `baseLodash`.
+lodash.prototype = baseLodash.prototype;
 
 export default lodash;

chain/plant.js

@@ -0,0 +1,2 @@
+import wrapperPlant from './wrapperPlant'
+export default wrapperPlant;

chain/run.js

@@ -0,0 +1,2 @@
+import wrapperValue from './wrapperValue'
+export default wrapperValue;

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/wrapperChain.js

@@ -6,7 +6,7 @@ import chain from './chain';
  * @name chain
  * @memberOf _
  * @category Chain
- * @returns {*} Returns the `lodash` object.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
  * @example
  *
  * var users = [

chain/wrapperCommit.js

@@ -0,0 +1,32 @@
+import LodashWrapper from '../internal/LodashWrapper';
+
+/**
+ * Executes the chained sequence and returns the wrapped result.
+ *
+ * @name commit
+ * @memberOf _
+ * @category Chain
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2];
+ * var wrapper = _(array).push(3);
+ *
+ * console.log(array);
+ * // => [1, 2]
+ *
+ * wrapper = wrapper.commit();
+ * console.log(array);
+ * // => [1, 2, 3]
+ *
+ * wrapper.last();
+ * // => 3
+ *
+ * console.log(array);
+ * // => [1, 2, 3]
+ */
+function wrapperCommit() {
+  return new LodashWrapper(this.value(), this.__chain__);
+}
+
+export default wrapperCommit;

chain/wrapperPlant.js

@@ -0,0 +1,45 @@
+import baseLodash from '../internal/baseLodash';
+import wrapperClone from '../internal/wrapperClone';
+
+/**
+ * Creates a clone of the chained sequence planting `value` as the wrapped value.
+ *
+ * @name plant
+ * @memberOf _
+ * @category Chain
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var array = [1, 2];
+ * var wrapper = _(array).map(function(value) {
+ *   return Math.pow(value, 2);
+ * });
+ *
+ * var other = [3, 4];
+ * var otherWrapper = wrapper.plant(other);
+ *
+ * otherWrapper.value();
+ * // => [9, 16]
+ *
+ * wrapper.value();
+ * // => [1, 4]
+ */
+function wrapperPlant(value) {
+  var result,
+      parent = this;
+
+  while (parent instanceof baseLodash) {
+    var clone = wrapperClone(parent);
+    if (result) {
+      previous.__wrapped__ = clone;
+    } else {
+      result = clone;
+    }
+    var previous = clone;
+    parent = parent.__wrapped__;
+  }
+  previous.__wrapped__ = value;
+  return result;
+}
+
+export default wrapperPlant;

chain/wrapperReverse.js

@@ -11,7 +11,7 @@ import thru from './thru';
  * @name reverse
  * @memberOf _
  * @category Chain
- * @returns {Object} Returns the new reversed `lodash` object.
+ * @returns {Object} Returns the new reversed `lodash` wrapper instance.
  * @example
  *
  * var array = [1, 2, 3];
@@ -28,7 +28,7 @@ function wrapperReverse() {
     if (this.__actions__.length) {
       value = new LazyWrapper(this);
     }
-    return new LodashWrapper(value.reverse());
+    return new LodashWrapper(value.reverse(), this.__chain__);
   }
   return this.thru(function(value) {
     return value.reverse();

chain/wrapperValue.js

@@ -5,7 +5,7 @@ import baseWrapperValue from '../internal/baseWrapperValue';
  *
  * @name value
  * @memberOf _
- * @alias toJSON, valueOf
+ * @alias run, toJSON, valueOf
  * @category Chain
  * @returns {*} Returns the resolved unwrapped value.
  * @example

collection.js

@@ -23,8 +23,8 @@ import indexBy from './collection/indexBy';
 import inject from './collection/inject';
 import invoke from './collection/invoke';
 import map from './collection/map';
-import max from './collection/max';
-import min from './collection/min';
+import max from './math/max';
+import min from './math/min';
 import partition from './collection/partition';
 import pluck from './collection/pluck';
 import reduce from './collection/reduce';
@@ -37,6 +37,8 @@ import size from './collection/size';
 import some from './collection/some';
 import sortBy from './collection/sortBy';
 import sortByAll from './collection/sortByAll';
+import sortByOrder from './collection/sortByOrder';
+import sum from './math/sum';
 import where from './collection/where';
 
 export default {
@@ -79,5 +81,7 @@ export default {
   'some': some,
   'sortBy': sortBy,
   'sortByAll': sortByAll,
+  'sortByOrder': sortByOrder,
+  'sum': sum,
   'where': where
 };

collection/at.js

@@ -17,8 +17,8 @@ import toIterable from '../internal/toIterable';
  * @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

@@ -13,10 +13,14 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * The `iteratee` is bound to `thisArg` and invoked with three arguments;
  * (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -25,16 +29,19 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [iteratee=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {Object} Returns the composed aggregate object.
  * @example
  *
- * _.countBy([4.3, 6.1, 6.4], function(n) { return Math.floor(n); });
+ * _.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/every.js

@@ -8,10 +8,14 @@ import isArray from '../lang/isArray';
  * The predicate is bound to `thisArg` and invoked with three arguments;
  * (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -21,27 +25,30 @@ import isArray from '../lang/isArray';
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {boolean} Returns `true` if all elements pass the predicate check,
  *  else `false`.
  * @example
  *
- * _.every([true, 1, null, 'yes']);
+ * _.every([true, 1, null, 'yes'], Boolean);
  * // => false
  *
  * var users = [
- *   { 'user': 'barney', 'age': 36 },
- *   { 'user': 'fred',   'age': 40 }
+ *   { 'user': 'barney', 'active': false },
+ *   { 'user': 'fred',   'active': false }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.every(users, 'age');
+ * // using the `_.matches` callback shorthand
+ * _.every(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.every(users, 'active', false);
  * // => true
  *
- * // using the "_.matches" callback shorthand
- * _.every(users, { 'age': 36 });
+ * // using the `_.property` callback shorthand
+ * _.every(users, 'active');
  * // => false
  */
 function every(collection, predicate, thisArg) {

collection/filter.js

@@ -8,10 +8,14 @@ import isArray from '../lang/isArray';
  * `predicate` returns truthy for. The predicate is bound to `thisArg` and
  * invoked with three arguments; (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -21,26 +25,31 @@ import isArray from '../lang/isArray';
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {Array} Returns the new filtered array.
  * @example
  *
- * var evens = _.filter([1, 2, 3, 4], function(n) { return n % 2 == 0; });
- * // => [2, 4]
+ * _.filter([4, 5, 6], function(n) {
+ *   return n % 2 == 0;
+ * });
+ * // => [4, 6]
  *
  * var users = [
- *   { 'user': 'barney', 'age': 36, 'active': false },
- *   { 'user': 'fred',   'age': 40, 'active': true }
+ *   { 'user': 'barney', 'age': 36, 'active': true },
+ *   { 'user': 'fred',   'age': 40, 'active': false }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.pluck(_.filter(users, 'active'), 'user');
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.filter(users, { 'age': 36, 'active': true }), 'user');
+ * // => ['barney']
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.filter(users, 'active', false), 'user');
  * // => ['fred']
  *
- * // using the "_.matches" callback shorthand
- * _.pluck(_.filter(users, { 'age': 36 }), 'user');
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.filter(users, 'active'), 'user');
  * // => ['barney']
  */
 function filter(collection, predicate, thisArg) {

collection/find.js

@@ -9,10 +9,14 @@ import isArray from '../lang/isArray';
  * `predicate` returns truthy for. The predicate is bound to `thisArg` and
  * invoked with three arguments; (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -22,28 +26,33 @@ import isArray from '../lang/isArray';
  * @category Collection
  * @param {Array|Object|string} collection The collection to search.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {*} Returns the matched element, else `undefined`.
  * @example
  *
  * var users = [
- *   { 'user': 'barney',  'age': 36, 'active': false },
- *   { 'user': 'fred',    'age': 40, 'active': true },
- *   { 'user': 'pebbles', 'age': 1,  'active': false }
+ *   { 'user': 'barney',  'age': 36, 'active': true },
+ *   { 'user': 'fred',    'age': 40, 'active': false },
+ *   { '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
- * _.result(_.find(users, { 'age': 1 }), 'user');
+ * // using the `_.matches` callback shorthand
+ * _.result(_.find(users, { 'age': 1, 'active': true }), 'user');
  * // => 'pebbles'
  *
- * // using the "_.property" callback shorthand
- * _.result(_.find(users, 'active'), 'user');
+ * // using the `_.matchesProperty` callback shorthand
+ * _.result(_.find(users, 'active', false), 'user');
  * // => 'fred'
+ *
+ * // using the `_.property` callback shorthand
+ * _.result(_.find(users, 'active'), 'user');
+ * // => 'barney'
  */
 function find(collection, predicate, thisArg) {
   if (isArray(collection)) {

collection/findLast.js

@@ -11,13 +11,14 @@ import baseFind from '../internal/baseFind';
  * @category Collection
  * @param {Array|Object|string} collection The collection to search.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {*} Returns the matched element, else `undefined`.
  * @example
  *
- * _.findLast([1, 2, 3, 4], function(n) { return n % 2 == 1; });
+ * _.findLast([1, 2, 3, 4], function(n) {
+ *   return n % 2 == 1;
+ * });
  * // => 3
  */
 function findLast(collection, predicate, thisArg) {

collection/findWhere.js

@@ -1,11 +1,16 @@
+import baseMatches from '../internal/baseMatches';
 import find from './find';
-import matches from '../utility/matches';
 
 /**
  * Performs a deep comparison between each element in `collection` and the
  * source object, returning the first element that has equivalent property
  * values.
  *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties. For comparing a single
+ * own or inherited property value see `_.matchesProperty`.
+ *
  * @static
  * @memberOf _
  * @category Collection
@@ -15,18 +20,18 @@ import matches from '../utility/matches';
  * @example
  *
  * var users = [
- *   { 'user': 'barney', 'age': 36, 'status': 'busy' },
- *   { 'user': 'fred',   'age': 40, 'status': 'busy' }
+ *   { 'user': 'barney', 'age': 36, 'active': true },
+ *   { 'user': 'fred',   'age': 40, 'active': false }
  * ];
  *
- * _.result(_.findWhere(users, { 'status': 'busy' }), 'user');
+ * _.result(_.findWhere(users, { 'age': 36, 'active': true }), 'user');
  * // => 'barney'
  *
- * _.result(_.findWhere(users, { 'age': 40 }), 'user');
+ * _.result(_.findWhere(users, { 'age': 40, 'active': false }), 'user');
  * // => 'fred'
  */
 function findWhere(collection, source) {
-  return find(collection, matches(source));
+  return find(collection, baseMatches(source));
 }
 
 export default findWhere;

collection/forEach.js

@@ -23,10 +23,14 @@ import isArray from '../lang/isArray';
  * @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 @@ import isArray from '../lang/isArray';
  * @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

@@ -13,10 +13,14 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * The `iteratee` is bound to `thisArg` and invoked with three arguments;
  * (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -25,19 +29,22 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [iteratee=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {Object} Returns the composed aggregate object.
  * @example
  *
- * _.groupBy([4.2, 6.1, 6.4], function(n) { return Math.floor(n); });
+ * _.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
+ * // using the `_.property` callback shorthand
  * _.groupBy(['one', 'two', 'three'], 'length');
  * // => { '3': ['one', 'two'], '5': ['three'] }
  */

collection/indexBy.js

@@ -7,10 +7,14 @@ import createAggregator from '../internal/createAggregator';
  * iteratee function is bound to `thisArg` and invoked with three arguments;
  * (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -19,8 +23,7 @@ import createAggregator from '../internal/createAggregator';
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [iteratee=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {Object} Returns the composed aggregate object.
  * @example
@@ -33,10 +36,14 @@ import createAggregator from '../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

@@ -8,37 +8,54 @@ import isArray from '../lang/isArray';
  * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
  * arguments; (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
+ * Many lodash methods are guarded to work as interatees for methods like
+ * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
+ *
+ * The guarded methods are:
+ * `ary`, `callback`, `chunk`, `clone`, `create`, `curry`, `curryRight`, `drop`,
+ * `dropRight`, `fill`, `flatten`, `invert`, `max`, `min`, `parseInt`, `slice`,
+ * `sortBy`, `take`, `takeRight`, `template`, `trim`, `trimLeft`, `trimRight`,
+ * `trunc`, `random`, `range`, `sample`, `uniq`, and `words`
+ *
  * @static
  * @memberOf _
  * @alias collect
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [iteratee=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
+ *  create a `_.property` or `_.matches` style callback respectively.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {Array} Returns the new mapped array.
  * @example
  *
- * _.map([1, 2, 3], function(n) { return n * 3; });
- * // => [3, 6, 9]
+ * 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' },
  *   { 'user': 'fred' }
  * ];
  *
- * // using the "_.property" callback shorthand
+ * // using the `_.property` callback shorthand
  * _.map(users, 'user');
  * // => ['barney', 'fred']
  */

collection/max.js

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

collection/min.js

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

collection/partition.js

@@ -6,10 +6,14 @@ import createAggregator from '../internal/createAggregator';
  * contains elements `predicate` returns falsey for. The predicate is bound
  * to `thisArg` and invoked with three arguments; (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -18,17 +22,20 @@ import createAggregator from '../internal/createAggregator';
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {Array} Returns the array of grouped elements.
  * @example
  *
- * _.partition([1, 2, 3], function(n) { return n % 2; });
+ * _.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 },
@@ -36,12 +43,20 @@ import createAggregator from '../internal/createAggregator';
  *   { 'user': 'pebbles', 'age': 1,  'active': false }
  * ];
  *
- * // using the "_.matches" callback shorthand
- * _.map(_.partition(users, { 'age': 1 }), 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);
  * // => [['pebbles'], ['barney', 'fred']]
  *
- * // using the "_.property" callback shorthand
- * _.map(_.partition(users, 'active'), function(array) { return _.pluck(array, 'user'); });
+ * // using the `_.matchesProperty` callback shorthand
+ * _.map(_.partition(users, 'active', false), mapper);
+ * // => [['barney', 'pebbles'], ['fred']]
+ *
+ * // using the `_.property` callback shorthand
+ * _.map(_.partition(users, 'active'), mapper);
  * // => [['fred'], ['barney', 'pebbles']]
  */
 var partition = createAggregator(function(result, value, key) {

collection/pluck.js

@@ -1,5 +1,5 @@
+import baseProperty from '../internal/baseProperty';
 import map from './map';
-import property from '../utility/property';
 
 /**
  * Gets the value of `key` from all elements in `collection`.
@@ -25,7 +25,7 @@ import property from '../utility/property';
  * // => [36, 40] (iteration order is not guaranteed)
  */
 function pluck(collection, key) {
-  return map(collection, property(key));
+  return map(collection, baseProperty(key));
 }
 
 export default pluck;

collection/reduce.js

@@ -12,6 +12,12 @@ import isArray from '../lang/isArray';
  * value. The `iteratee` is bound to `thisArg`and invoked with four arguments;
  * (accumulator, value, index|key, collection).
  *
+ * Many lodash methods are guarded to work as interatees for methods like
+ * `_.reduce`, `_.reduceRight`, and `_.transform`.
+ *
+ * The guarded methods are:
+ * `assign`, `defaults`, `merge`, and `sortAllBy`
+ *
  * @static
  * @memberOf _
  * @alias foldl, inject
@@ -23,14 +29,16 @@ import isArray from '../lang/isArray';
  * @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 @@ import isArray from '../lang/isArray';
  * @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

@@ -7,10 +7,14 @@ import isArray from '../lang/isArray';
  * The opposite of `_.filter`; this method returns the elements of `collection`
  * that `predicate` does **not** return truthy for.
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -19,13 +23,14 @@ import isArray from '../lang/isArray';
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {Array} Returns the new filtered array.
  * @example
  *
- * var odds = _.reject([1, 2, 3, 4], function(n) { return n % 2 == 0; });
+ * _.reject([1, 2, 3, 4], function(n) {
+ *   return n % 2 == 0;
+ * });
  * // => [1, 3]
  *
  * var users = [
@@ -33,13 +38,17 @@ import isArray from '../lang/isArray';
  *   { 'user': 'fred',   'age': 40, 'active': true }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.pluck(_.reject(users, 'active'), 'user');
+ * // using the `_.matches` callback shorthand
+ * _.pluck(_.reject(users, { 'age': 40, 'active': true }), 'user');
  * // => ['barney']
  *
- * // using the "_.matches" callback shorthand
- * _.pluck(_.reject(users, { 'age': 36 }), 'user');
+ * // using the `_.matchesProperty` callback shorthand
+ * _.pluck(_.reject(users, 'active', false), 'user');
  * // => ['fred']
+ *
+ * // using the `_.property` callback shorthand
+ * _.pluck(_.reject(users, 'active'), 'user');
+ * // => ['barney']
  */
 function reject(collection, predicate, thisArg) {
   var func = isArray(collection) ? arrayFilter : baseFilter;

collection/size.js

@@ -2,8 +2,8 @@ import isLength from '../internal/isLength';
 import keys from '../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 @@ import keys from '../object/keys';
  * @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

@@ -9,10 +9,14 @@ import isArray from '../lang/isArray';
  * over the entire collection. The predicate is bound to `thisArg` and invoked
  * with three arguments; (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -22,8 +26,7 @@ import isArray from '../lang/isArray';
  * @category Collection
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Function|Object|string} [predicate=_.identity] The function invoked
- *  per iteration. If a property name or object is provided it is used to
- *  create a "_.property" or "_.matches" style callback respectively.
+ *  per iteration.
  * @param {*} [thisArg] The `this` binding of `predicate`.
  * @returns {boolean} Returns `true` if any element passes the predicate check,
  *  else `false`.
@@ -33,17 +36,21 @@ import isArray from '../lang/isArray';
  * // => true
  *
  * var users = [
- *   { 'user': 'barney', 'age': 36, 'active': false },
- *   { 'user': 'fred',   'age': 40, 'active': true }
+ *   { 'user': 'barney', 'active': true },
+ *   { 'user': 'fred',   'active': false }
  * ];
  *
- * // using the "_.property" callback shorthand
- * _.some(users, 'active');
+ * // using the `_.matches` callback shorthand
+ * _.some(users, { 'user': 'barney', 'active': false });
+ * // => false
+ *
+ * // using the `_.matchesProperty` callback shorthand
+ * _.some(users, 'active', false);
  * // => true
  *
- * // using the "_.matches" callback shorthand
- * _.some(users, { 'age': 1 });
- * // => false
+ * // using the `_.property` callback shorthand
+ * _.some(users, 'active');
+ * // => true
  */
 function some(collection, predicate, thisArg) {
   var func = isArray(collection) ? arraySome : baseSome;

collection/sortBy.js

@@ -12,10 +12,14 @@ import isLength from '../internal/isLength';
  * The `iteratee` is bound to `thisArg` and invoked with three arguments;
  * (value, index|key, collection).
  *
- * If a property name is provided for `predicate` the created "_.property"
+ * If a property name is provided for `predicate` the created `_.property`
  * style callback returns the property value of the given element.
  *
- * If an object is provided for `predicate` the created "_.matches" style
+ * 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`.
  *
@@ -25,15 +29,19 @@ import isLength from '../internal/isLength';
  * @param {Array|Object|string} collection The collection to iterate over.
  * @param {Array|Function|Object|string} [iteratee=_.identity] The function
  *  invoked per iteration. If a property name or an object is provided it is
- *  used to create a "_.property" or "_.matches" style callback respectively.
+ *  used to create a `_.property` or `_.matches` style callback respectively.
  * @param {*} [thisArg] The `this` binding of `iteratee`.
  * @returns {Array} Returns the new sorted array.
  * @example
  *
- * _.sortBy([1, 2, 3], function(n) { return Math.sin(n); });
+ * _.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 = [
@@ -42,13 +50,16 @@ import isLength from '../internal/isLength';
  *   { 'user': 'barney' }
  * ];
  *
- * // using the "_.property" callback shorthand
+ * // using the `_.property` callback shorthand
  * _.pluck(_.sortBy(users, 'user'), 'user');
  * // => ['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 @@
-import baseEach from '../internal/baseEach';
 import baseFlatten from '../internal/baseFlatten';
-import baseSortBy from '../internal/baseSortBy';
-import compareMultipleAscending from '../internal/compareMultipleAscending';
+import baseSortByOrder from '../internal/baseSortByOrder';
 import isIterateeCall from '../internal/isIterateeCall';
-import isLength from '../internal/isLength';
 
 /**
  * This method is like `_.sortBy` except that it sorts by property names
@@ -29,25 +26,16 @@ import isLength from '../internal/isLength';
  * // => [['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, key, collection) {
-    var length = props.length,
-        criteria = Array(length);
-
-    while (length--) {
-      criteria[length] = value == null ? undefined : value[props[length]];
-    }
-    result[++index] = { 'criteria': criteria, 'index': index, 'value': value };
-  });
-  return baseSortBy(result, compareMultipleAscending);
+  return baseSortByOrder(collection, baseFlatten(args, false, false, 1), []);
 }
 
 export default sortByAll;

collection/sortByOrder.js

@@ -0,0 +1,48 @@
+import baseSortByOrder from '../internal/baseSortByOrder';
+import isArray from '../lang/isArray';
+import isIterateeCall from '../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);
+}
+
+export default sortByOrder;

collection/sum.js

@@ -0,0 +1,2 @@
+import sum from '../math/sum'
+export default sum;

collection/where.js

@@ -1,11 +1,16 @@
+import baseMatches from '../internal/baseMatches';
 import filter from './filter';
-import matches from '../utility/matches';
 
 /**
  * Performs a deep comparison between each element in `collection` and the
  * source object, returning an array of all elements that have equivalent
  * property values.
  *
+ * **Note:** This method supports comparing arrays, booleans, `Date` objects,
+ * numbers, `Object` objects, regexes, and strings. Objects are compared by
+ * their own, not inherited, enumerable properties. For comparing a single
+ * own or inherited property value see `_.matchesProperty`.
+ *
  * @static
  * @memberOf _
  * @category Collection
@@ -15,21 +20,18 @@ import matches from '../utility/matches';
  * @example
  *
  * var users = [
- *   { 'user': 'barney', 'age': 36, 'status': 'busy', 'pets': ['hoppy'] },
- *   { 'user': 'fred',   'age': 40, 'status': 'busy', 'pets': ['baby puss', 'dino'] }
+ *   { 'user': 'barney', 'age': 36, 'active': false, 'pets': ['hoppy'] },
+ *   { 'user': 'fred',   'age': 40, 'active': true, 'pets': ['baby puss', 'dino'] }
  * ];
  *
- * _.pluck(_.where(users, { 'age': 36 }), 'user');
+ * _.pluck(_.where(users, { 'age': 36, 'active': false }), 'user');
  * // => ['barney']
  *
  * _.pluck(_.where(users, { 'pets': ['dino'] }), 'user');
  * // => ['fred']
- *
- * _.pluck(_.where(users, { 'status': 'busy' }), 'user');
- * // => ['barney', 'fred']
  */
 function where(collection, source) {
-  return filter(collection, matches(source));
+  return filter(collection, baseMatches(source));
 }
 
 export default where;

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.js

@@ -19,6 +19,7 @@ import once from './function/once';
 import partial from './function/partial';
 import partialRight from './function/partialRight';
 import rearg from './function/rearg';
+import spread from './function/spread';
 import throttle from './function/throttle';
 import wrap from './function/wrap';
 
@@ -44,6 +45,7 @@ export default {
   'partial': partial,
   'partialRight': partialRight,
   'rearg': rearg,
+  'spread': spread,
   'throttle': throttle,
   'wrap': wrap
 };

function/after.js

@@ -1,4 +1,3 @@
-import isFunction from '../lang/isFunction';
 import root from '../internal/root';
 
 /** Used as the `TypeError` message for "Functions" methods. */
@@ -31,8 +30,8 @@ var nativeIsFinite = root.isFinite;
  * // => logs 'done saving!' after the two async saves have completed
  */
 function after(n, func) {
-  if (!isFunction(func)) {
-    if (isFunction(n)) {
+  if (typeof func != 'function') {
+    if (typeof n == 'function') {
       var temp = n;
       n = func;
       func = temp;

function/before.js

@@ -1,5 +1,3 @@
-import isFunction from '../lang/isFunction';
-
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
@@ -21,8 +19,8 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  */
 function before(n, func) {
   var result;
-  if (!isFunction(func)) {
-    if (isFunction(n)) {
+  if (typeof func != 'function') {
+    if (typeof n == 'function') {
       var temp = n;
       n = func;
       func = temp;

function/bindAll.js

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

function/debounce.js

@@ -1,4 +1,3 @@
-import isFunction from '../lang/isFunction';
 import isObject from '../lang/isObject';
 import now from '../date/now';
 
@@ -27,7 +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.
@@ -82,10 +81,10 @@ function debounce(func, wait, options) {
       maxWait = false,
       trailing = true;
 
-  if (!isFunction(func)) {
+  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 @@ import baseDelay from '../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 @@ import baseDelay from '../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 @@
-import arrayEvery from '../internal/arrayEvery';
-import isFunction from '../lang/isFunction';
-
-/** Used as the `TypeError` message for "Functions" methods. */
-var FUNC_ERROR_TEXT = 'Expected a function';
+import createComposer from '../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() {};
-  }
-  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();
 
 export default flow;

function/flowRight.js

@@ -1,8 +1,4 @@
-import arrayEvery from '../internal/arrayEvery';
-import isFunction from '../lang/isFunction';
-
-/** Used as the `TypeError` message for "Functions" methods. */
-var FUNC_ERROR_TEXT = 'Expected a function';
+import createComposer from '../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() {};
-  }
-  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);
 
 export default flowRight;

function/memoize.js

@@ -1,5 +1,4 @@
 import MapCache from '../internal/MapCache';
-import isFunction from '../lang/isFunction';
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
@@ -58,17 +57,18 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * // => { 'user': 'barney' }
  */
 function memoize(func, resolver) {
-  if (!isFunction(func) || (resolver && !isFunction(resolver))) {
+  if (typeof func != 'function' || (resolver && typeof resolver != 'function')) {
     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/negate.js

@@ -1,5 +1,3 @@
-import isFunction from '../lang/isFunction';
-
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
@@ -23,7 +21,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * // => [1, 3, 5]
  */
 function negate(predicate) {
-  if (!isFunction(predicate)) {
+  if (typeof predicate != 'function') {
     throw new TypeError(FUNC_ERROR_TEXT);
   }
   return function() {

function/once.js

@@ -7,7 +7,6 @@ import before from './before';
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Function
  * @param {Function} func The function to restrict.
  * @returns {Function} Returns the new restricted function.

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/spread.js

@@ -0,0 +1,43 @@
+/** Used as the `TypeError` message for "Functions" methods. */
+var FUNC_ERROR_TEXT = 'Expected a function';
+
+/**
+ * Creates a function that invokes `func` with the `this` binding of the
+ * created function and the array of arguments provided to the created
+ * function much like [Function#apply](http://es5.github.io/#x15.3.4.3).
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to spread arguments over.
+ * @returns {*} Returns the new function.
+ * @example
+ *
+ * var spread = _.spread(function(who, what) {
+ *   return who + ' says ' + what;
+ * });
+ *
+ * spread(['Fred', 'hello']);
+ * // => 'Fred says hello'
+ *
+ * // with a Promise
+ * var numbers = Promise.all([
+ *   Promise.resolve(40),
+ *   Promise.resolve(36)
+ * ]);
+ *
+ * numbers.then(_.spread(function(x, y) {
+ *   return x + y;
+ * }));
+ * // => a Promise of 76
+ */
+function spread(func) {
+  if (typeof func != 'function') {
+    throw new TypeError(FUNC_ERROR_TEXT);
+  }
+  return function(array) {
+    return func.apply(this, array);
+  };
+}
+
+export default spread;

function/throttle.js

@@ -1,5 +1,4 @@
 import debounce from './debounce';
-import isFunction from '../lang/isFunction';
 import isObject from '../lang/isObject';
 
 /** Used as the `TypeError` message for "Functions" methods. */
@@ -31,7 +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.
@@ -44,8 +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);
@@ -54,7 +54,7 @@ function throttle(func, wait, options) {
   var leading = true,
       trailing = true;
 
-  if (!isFunction(func)) {
+  if (typeof func != 'function') {
     throw new TypeError(FUNC_ERROR_TEXT);
   }
   if (options === false) {

internal/LazyWrapper.js

@@ -1,3 +1,6 @@
+import baseCreate from './baseCreate';
+import baseLodash from './baseLodash';
+
 /** Used as references for `-Infinity` and `Infinity`. */
 var POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
 
@@ -8,14 +11,17 @@ var POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
  * @param {*} value The value to wrap.
  */
 function LazyWrapper(value) {
-  this.actions = null;
-  this.dir = 1;
-  this.dropCount = 0;
-  this.filtered = false;
-  this.iteratees = null;
-  this.takeCount = POSITIVE_INFINITY;
-  this.views = null;
-  this.wrapped = value;
+  this.__wrapped__ = value;
+  this.__actions__ = null;
+  this.__dir__ = 1;
+  this.__dropCount__ = 0;
+  this.__filtered__ = false;
+  this.__iteratees__ = null;
+  this.__takeCount__ = POSITIVE_INFINITY;
+  this.__views__ = null;
 }
 
+LazyWrapper.prototype = baseCreate(baseLodash.prototype);
+LazyWrapper.prototype.constructor = LazyWrapper;
+
 export default LazyWrapper;

internal/LodashWrapper.js

@@ -1,3 +1,6 @@
+import baseCreate from './baseCreate';
+import baseLodash from './baseLodash';
+
 /**
  * The base constructor for creating `lodash` wrapper objects.
  *
@@ -7,9 +10,12 @@
  * @param {Array} [actions=[]] Actions to peform to resolve the unwrapped value.
  */
 function LodashWrapper(value, chainAll, actions) {
+  this.__wrapped__ = value;
   this.__actions__ = actions || [];
   this.__chain__ = !!chainAll;
-  this.__wrapped__ = value;
 }
 
+LodashWrapper.prototype = baseCreate(baseLodash.prototype);
+LodashWrapper.prototype.constructor = LodashWrapper;
+
 export default LodashWrapper;

internal/baseAssign.js

@@ -17,14 +17,14 @@ function baseAssign(object, source, customizer) {
     return baseCopy(source, object, props);
   }
   var index = -1,
-      length = props.length
+      length = props.length;
 
   while (++index < length) {
     var key = props[index],
         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/baseCallback.js

@@ -1,4 +1,5 @@
 import baseMatches from './baseMatches';
+import baseMatchesProperty from './baseMatchesProperty';
 import baseProperty from './baseProperty';
 import bindCallback from './bindCallback';
 import identity from '../utility/identity';
@@ -24,10 +25,12 @@ function baseCallback(func, thisArg, argCount) {
   if (func == null) {
     return identity;
   }
-  // Handle "_.property" and "_.matches" style callback shorthands.
-  return type == 'object'
-    ? baseMatches(func, !argCount)
-    : baseProperty(func + '');
+  if (type == 'object') {
+    return baseMatches(func);
+  }
+  return typeof thisArg == 'undefined'
+    ? baseProperty(func + '')
+    : baseMatchesProperty(func + '', thisArg);
 }
 
 export default baseCallback;

internal/baseDelay.js

@@ -1,5 +1,4 @@
 import baseSlice from './baseSlice';
-import isFunction from '../lang/isFunction';
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
@@ -15,7 +14,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * @returns {number} Returns the timer id.
  */
 function baseDelay(func, wait, args, fromIndex) {
-  if (!isFunction(func)) {
+  if (typeof func != 'function') {
     throw new TypeError(FUNC_ERROR_TEXT);
   }
   return setTimeout(function() { func.apply(undefined, baseSlice(args, fromIndex)); }, wait);

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

@@ -0,0 +1,31 @@
+/**
+ * The base implementation of `_.fill` without an iteratee call guard.
+ *
+ * @private
+ * @param {Array} array The array to fill.
+ * @param {*} value The value to fill `array` with.
+ * @param {number} [start=0] The start position.
+ * @param {number} [end=array.length] The end position.
+ * @returns {Array} Returns `array`.
+ */
+function baseFill(array, value, start, end) {
+  var length = array.length;
+
+  start = start == null ? 0 : (+start || 0);
+  if (start < 0) {
+    start = -start > length ? 0 : (length + start);
+  }
+  end = (typeof end == 'undefined' || end > length) ? length : (+end || 0);
+  if (end < 0) {
+    end += length;
+  }
+  length = start > end ? 0 : (end >>> 0);
+  start >>>= 0;
+
+  while (start < length) {
+    array[start++] = value;
+  }
+  return array;
+}
+
+export default baseFill;

internal/baseFlatten.js

@@ -9,13 +9,13 @@ import isObjectLike from './isObjectLike';
  *
  * @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 @@ import indexOfNaN from './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;
+}
+
+export default baseIsFunction;

internal/baseIsMatch.js

@@ -11,7 +11,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * shorthands or `this` binding.
  *
  * @private
- * @param {Object} source The object to inspect.
+ * @param {Object} object The object to inspect.
  * @param {Array} props The source property names to match.
  * @param {Array} values The source values to match.
  * @param {Array} strictCompareFlags Strict comparison flags for source values.

internal/baseLodash.js

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

internal/baseMatches.js

@@ -1,4 +1,3 @@
-import baseClone from './baseClone';
 import baseIsMatch from './baseIsMatch';
 import isStrictComparable from './isStrictComparable';
 import keys from '../object/keys';
@@ -10,15 +9,13 @@ var objectProto = Object.prototype;
 var hasOwnProperty = objectProto.hasOwnProperty;
 
 /**
- * The base implementation of `_.matches` which supports specifying whether
- * `source` should be cloned.
+ * The base implementation of `_.matches` which does not clone `source`.
  *
  * @private
  * @param {Object} source The object of property values to match.
- * @param {boolean} [isCloned] Specify cloning the source object.
  * @returns {Function} Returns the new function.
  */
-function baseMatches(source, isCloned) {
+function baseMatches(source) {
   var props = keys(source),
       length = props.length;
 
@@ -28,13 +25,10 @@ function baseMatches(source, isCloned) {
 
     if (isStrictComparable(value)) {
       return function(object) {
-        return object != null && value === object[key] && hasOwnProperty.call(object, key);
+        return object != null && object[key] === value && hasOwnProperty.call(object, key);
       };
     }
   }
-  if (isCloned) {
-    source = baseClone(source, true);
-  }
   var values = Array(length),
       strictCompareFlags = Array(length);
 

internal/baseMatchesProperty.js

@@ -0,0 +1,24 @@
+import baseIsEqual from './baseIsEqual';
+import isStrictComparable from './isStrictComparable';
+
+/**
+ * The base implementation of `_.matchesProperty` which does not coerce `key`
+ * to a string.
+ *
+ * @private
+ * @param {string} key The key of the property to get.
+ * @param {*} value The value to compare.
+ * @returns {Function} Returns the new function.
+ */
+function baseMatchesProperty(key, value) {
+  if (isStrictComparable(value)) {
+    return function(object) {
+      return object != null && object[key] === value;
+    };
+  }
+  return function(object) {
+    return object != null && baseIsEqual(value, object[key], null, true);
+  };
+}
+
+export default baseMatchesProperty;