diff --git a/README.md b/README.md
index 937b54f8d..6028ddf6b 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash-amd v4.1.0
+# lodash-amd v4.2.0
 
 The [lodash](https://lodash.com/) library exported as [AMD](https://github.com/amdjs/amdjs-api/wiki/AMD) modules.
 
@@ -27,4 +27,4 @@ require({
 });
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.1.0-amd) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.2.0-amd) for more details.
diff --git a/_apply.js b/_apply.js
index 54cdb10c7..eea9fd562 100644
--- a/_apply.js
+++ b/_apply.js
@@ -7,11 +7,11 @@ define([], function() {
    * @private
    * @param {Function} func The function to invoke.
    * @param {*} thisArg The `this` binding of `func`.
-   * @param {...*} [args] The arguments to invoke `func` with.
+   * @param {...*} args The arguments to invoke `func` with.
    * @returns {*} Returns the result of `func`.
    */
   function apply(func, thisArg, args) {
-    var length = args ? args.length : 0;
+    var length = args.length;
     switch (length) {
       case 0: return func.call(thisArg);
       case 1: return func.call(thisArg, args[0]);
diff --git a/_baseSum.js b/_baseSum.js
index feb11a1f4..3448ed335 100644
--- a/_baseSum.js
+++ b/_baseSum.js
@@ -22,7 +22,7 @@ define([], function() {
         result = result === undefined ? current : (result + current);
       }
     }
-    return length ? result : 0;
+    return result;
   }
 
   return baseSum;
diff --git a/array.js b/array.js
index 3ab7b3309..6fb6328c7 100644
--- a/array.js
+++ b/array.js
@@ -1,4 +1,4 @@
-define(['./chunk', './compact', './concat', './difference', './differenceBy', './differenceWith', './drop', './dropRight', './dropRightWhile', './dropWhile', './fill', './findIndex', './findLastIndex', './flatMap', './flatten', './flattenDeep', './fromPairs', './head', './indexOf', './initial', './intersection', './intersectionBy', './intersectionWith', './join', './last', './lastIndexOf', './pull', './pullAll', './pullAllBy', './pullAt', './remove', './reverse', './slice', './sortedIndex', './sortedIndexBy', './sortedIndexOf', './sortedLastIndex', './sortedLastIndexBy', './sortedLastIndexOf', './sortedUniq', './sortedUniqBy', './tail', './take', './takeRight', './takeRightWhile', './takeWhile', './union', './unionBy', './unionWith', './uniq', './uniqBy', './uniqWith', './unzip', './unzipWith', './without', './xor', './xorBy', './xorWith', './zip', './zipObject', './zipObjectDeep', './zipWith'], function(chunk, compact, concat, difference, differenceBy, differenceWith, drop, dropRight, dropRightWhile, dropWhile, fill, findIndex, findLastIndex, flatMap, flatten, flattenDeep, fromPairs, head, indexOf, initial, intersection, intersectionBy, intersectionWith, join, last, lastIndexOf, pull, pullAll, pullAllBy, pullAt, remove, reverse, slice, sortedIndex, sortedIndexBy, sortedIndexOf, sortedLastIndex, sortedLastIndexBy, sortedLastIndexOf, sortedUniq, sortedUniqBy, tail, take, takeRight, takeRightWhile, takeWhile, union, unionBy, unionWith, uniq, uniqBy, uniqWith, unzip, unzipWith, without, xor, xorBy, xorWith, zip, zipObject, zipObjectDeep, zipWith) {
+define(['./chunk', './compact', './concat', './difference', './differenceBy', './differenceWith', './drop', './dropRight', './dropRightWhile', './dropWhile', './fill', './findIndex', './findLastIndex', './flatten', './flattenDeep', './fromPairs', './head', './indexOf', './initial', './intersection', './intersectionBy', './intersectionWith', './join', './last', './lastIndexOf', './pull', './pullAll', './pullAllBy', './pullAt', './remove', './reverse', './slice', './sortedIndex', './sortedIndexBy', './sortedIndexOf', './sortedLastIndex', './sortedLastIndexBy', './sortedLastIndexOf', './sortedUniq', './sortedUniqBy', './tail', './take', './takeRight', './takeRightWhile', './takeWhile', './union', './unionBy', './unionWith', './uniq', './uniqBy', './uniqWith', './unzip', './unzipWith', './without', './xor', './xorBy', './xorWith', './zip', './zipObject', './zipObjectDeep', './zipWith'], function(chunk, compact, concat, difference, differenceBy, differenceWith, drop, dropRight, dropRightWhile, dropWhile, fill, findIndex, findLastIndex, flatten, flattenDeep, fromPairs, head, indexOf, initial, intersection, intersectionBy, intersectionWith, join, last, lastIndexOf, pull, pullAll, pullAllBy, pullAt, remove, reverse, slice, sortedIndex, sortedIndexBy, sortedIndexOf, sortedLastIndex, sortedLastIndexBy, sortedLastIndexOf, sortedUniq, sortedUniqBy, tail, take, takeRight, takeRightWhile, takeWhile, union, unionBy, unionWith, uniq, uniqBy, uniqWith, unzip, unzipWith, without, xor, xorBy, xorWith, zip, zipObject, zipObjectDeep, zipWith) {
   return {
     'chunk': chunk,
     'compact': compact,
@@ -13,7 +13,6 @@ define(['./chunk', './compact', './concat', './difference', './differenceBy', '.
     'fill': fill,
     'findIndex': findIndex,
     'findLastIndex': findLastIndex,
-    'flatMap': flatMap,
     'flatten': flatten,
     'flattenDeep': flattenDeep,
     'fromPairs': fromPairs,
diff --git a/attempt.js b/attempt.js
index 282250c27..bef212c82 100644
--- a/attempt.js
+++ b/attempt.js
@@ -1,4 +1,4 @@
-define(['./_apply', './isError', './rest'], function(apply, isError, rest) {
+define(['./_apply', './isObject', './rest'], function(apply, isObject, rest) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -14,7 +14,7 @@ define(['./_apply', './isError', './rest'], function(apply, isError, rest) {
    * @returns {*} Returns the `func` result or error object.
    * @example
    *
-   * // avoid throwing errors for invalid selectors
+   * // Avoid throwing errors for invalid selectors.
    * var elements = _.attempt(function(selector) {
    *   return document.querySelectorAll(selector);
    * }, '>_>');
@@ -27,7 +27,7 @@ define(['./_apply', './isError', './rest'], function(apply, isError, rest) {
     try {
       return apply(func, undefined, args);
     } catch (e) {
-      return isError(e) ? e : new Error(e);
+      return isObject(e) ? e : new Error(e);
     }
   });
 
diff --git a/bind.js b/bind.js
index 395e6d3d2..19d27188f 100644
--- a/bind.js
+++ b/bind.js
@@ -34,7 +34,7 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
    * bound('!');
    * // => 'hi fred!'
    *
-   * // using placeholders
+   * // Bound with placeholders.
    * var bound = _.bind(greet, object, _, '!');
    * bound('hi');
    * // => 'hi fred!'
diff --git a/bindKey.js b/bindKey.js
index cc957dbc9..dc3e2d05c 100644
--- a/bindKey.js
+++ b/bindKey.js
@@ -44,7 +44,7 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
    * bound('!');
    * // => 'hiya fred!'
    *
-   * // using placeholders
+   * // Bound with placeholders.
    * var bound = _.bindKey(object, 'greet', _, '!');
    * bound('hi');
    * // => 'hiya fred!'
diff --git a/collection.js b/collection.js
index fbbf5cfdf..8c564ea3e 100644
--- a/collection.js
+++ b/collection.js
@@ -1,4 +1,4 @@
-define(['./at', './countBy', './each', './eachRight', './every', './filter', './find', './findLast', './forEach', './forEachRight', './groupBy', './includes', './invokeMap', './keyBy', './map', './orderBy', './partition', './reduce', './reduceRight', './reject', './sample', './sampleSize', './shuffle', './size', './some', './sortBy'], function(at, countBy, each, eachRight, every, filter, find, findLast, forEach, forEachRight, groupBy, includes, invokeMap, keyBy, map, orderBy, partition, reduce, reduceRight, reject, sample, sampleSize, shuffle, size, some, sortBy) {
+define(['./at', './countBy', './each', './eachRight', './every', './filter', './find', './findLast', './flatMap', './forEach', './forEachRight', './groupBy', './includes', './invokeMap', './keyBy', './map', './orderBy', './partition', './reduce', './reduceRight', './reject', './sample', './sampleSize', './shuffle', './size', './some', './sortBy'], function(at, countBy, each, eachRight, every, filter, find, findLast, flatMap, forEach, forEachRight, groupBy, includes, invokeMap, keyBy, map, orderBy, partition, reduce, reduceRight, reject, sample, sampleSize, shuffle, size, some, sortBy) {
   return {
     'at': at,
     'countBy': countBy,
@@ -8,6 +8,7 @@ define(['./at', './countBy', './each', './eachRight', './every', './filter', './
     'filter': filter,
     'find': find,
     'findLast': findLast,
+    'flatMap': flatMap,
     'forEach': forEach,
     'forEachRight': forEachRight,
     'groupBy': groupBy,
diff --git a/curry.js b/curry.js
index 9b4c258a9..a7584ba0c 100644
--- a/curry.js
+++ b/curry.js
@@ -42,7 +42,7 @@ define(['./_createWrapper'], function(createWrapper) {
    * curried(1, 2, 3);
    * // => [1, 2, 3]
    *
-   * // using placeholders
+   * // Curried with placeholders.
    * curried(1)(_, 3)(2);
    * // => [1, 2, 3]
    */
diff --git a/curryRight.js b/curryRight.js
index abd19786f..5fa232432 100644
--- a/curryRight.js
+++ b/curryRight.js
@@ -39,7 +39,7 @@ define(['./_createWrapper'], function(createWrapper) {
    * curried(1, 2, 3);
    * // => [1, 2, 3]
    *
-   * // using placeholders
+   * // Curried with placeholders.
    * curried(3)(1, _)(2);
    * // => [1, 2, 3]
    */
diff --git a/debounce.js b/debounce.js
index af8b23c4f..20852e84c 100644
--- a/debounce.js
+++ b/debounce.js
@@ -41,21 +41,21 @@ define(['./isObject', './now', './toNumber'], function(isObject, now, toNumber)
    * @returns {Function} Returns the new debounced function.
    * @example
    *
-   * // avoid costly calculations while the window size is in flux
+   * // Avoid costly calculations while the window size is in flux.
    * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
    *
-   * // invoke `sendMail` when clicked, debouncing subsequent calls
+   * // Invoke `sendMail` when clicked, debouncing subsequent calls.
    * jQuery(element).on('click', _.debounce(sendMail, 300, {
    *   'leading': true,
    *   'trailing': false
    * }));
    *
-   * // ensure `batchLog` is invoked once after 1 second of debounced calls
+   * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
    * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
    * var source = new EventSource('/stream');
    * jQuery(source).on('message', debounced);
    *
-   * // cancel a trailing debounced invocation
+   * // Cancel the trailing debounced invocation.
    * jQuery(window).on('popstate', debounced.cancel);
    */
   function debounce(func, wait, options) {
diff --git a/defer.js b/defer.js
index 18aa150e4..06741b97e 100644
--- a/defer.js
+++ b/defer.js
@@ -15,7 +15,7 @@ define(['./_baseDelay', './rest'], function(baseDelay, rest) {
    * _.defer(function(text) {
    *   console.log(text);
    * }, 'deferred');
-   * // logs 'deferred' after one or more milliseconds
+   * // => logs 'deferred' after one or more milliseconds
    */
   var defer = rest(function(func, args) {
     return baseDelay(func, 1, args);
diff --git a/differenceBy.js b/differenceBy.js
index 29038b4ee..6e78fa456 100644
--- a/differenceBy.js
+++ b/differenceBy.js
@@ -20,7 +20,7 @@ define(['./_baseDifference', './_baseFlatten', './_baseIteratee', './isArrayLike
    * _.differenceBy([3.1, 2.2, 1.3], [4.4, 2.5], Math.floor);
    * // => [3.1, 1.3]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
    * // => [{ 'x': 2 }]
    */
diff --git a/dropRightWhile.js b/dropRightWhile.js
index eaf43dc7d..e9579a3b1 100644
--- a/dropRightWhile.js
+++ b/dropRightWhile.js
@@ -22,15 +22,15 @@ define(['./_baseIteratee', './_baseWhile'], function(baseIteratee, baseWhile) {
    * _.dropRightWhile(users, function(o) { return !o.active; });
    * // => objects for ['barney']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
    * // => objects for ['barney', 'fred']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.dropRightWhile(users, ['active', false]);
    * // => objects for ['barney']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.dropRightWhile(users, 'active');
    * // => objects for ['barney', 'fred', 'pebbles']
    */
diff --git a/dropWhile.js b/dropWhile.js
index be3d3079a..116ce5ee1 100644
--- a/dropWhile.js
+++ b/dropWhile.js
@@ -22,15 +22,15 @@ define(['./_baseIteratee', './_baseWhile'], function(baseIteratee, baseWhile) {
    * _.dropWhile(users, function(o) { return !o.active; });
    * // => objects for ['pebbles']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.dropWhile(users, { 'user': 'barney', 'active': false });
    * // => objects for ['fred', 'pebbles']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.dropWhile(users, ['active', false]);
    * // => objects for ['pebbles']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.dropWhile(users, 'active');
    * // => objects for ['barney', 'fred', 'pebbles']
    */
diff --git a/every.js b/every.js
index 0ffef4ad1..396830647 100644
--- a/every.js
+++ b/every.js
@@ -25,15 +25,15 @@ define(['./_arrayEvery', './_baseEvery', './_baseIteratee', './isArray', './_isI
    *   { 'user': 'fred',   'active': false }
    * ];
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.every(users, { 'user': 'barney', 'active': false });
    * // => false
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.every(users, ['active', false]);
    * // => true
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.every(users, 'active');
    * // => false
    */
diff --git a/filter.js b/filter.js
index 3a4edd500..87eb82d08 100644
--- a/filter.js
+++ b/filter.js
@@ -21,15 +21,15 @@ define(['./_arrayFilter', './_baseFilter', './_baseIteratee', './isArray'], func
    * _.filter(users, function(o) { return !o.active; });
    * // => objects for ['fred']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.filter(users, { 'age': 36, 'active': true });
    * // => objects for ['barney']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.filter(users, ['active', false]);
    * // => objects for ['fred']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.filter(users, 'active');
    * // => objects for ['barney']
    */
diff --git a/find.js b/find.js
index a8c746ed5..ed3112b82 100644
--- a/find.js
+++ b/find.js
@@ -25,15 +25,15 @@ define(['./_baseEach', './_baseFind', './_baseFindIndex', './_baseIteratee', './
    * _.find(users, function(o) { return o.age < 40; });
    * // => object for 'barney'
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.find(users, { 'age': 1, 'active': true });
    * // => object for 'pebbles'
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.find(users, ['active', false]);
    * // => object for 'fred'
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.find(users, 'active');
    * // => object for 'barney'
    */
diff --git a/findIndex.js b/findIndex.js
index 23ccb065c..bff92db31 100644
--- a/findIndex.js
+++ b/findIndex.js
@@ -21,15 +21,15 @@ define(['./_baseFindIndex', './_baseIteratee'], function(baseFindIndex, baseIter
    * _.findIndex(users, function(o) { return o.user == 'barney'; });
    * // => 0
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findIndex(users, { 'user': 'fred', 'active': false });
    * // => 1
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findIndex(users, ['active', false]);
    * // => 0
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findIndex(users, 'active');
    * // => 2
    */
diff --git a/findKey.js b/findKey.js
index 1427f1d65..8b3ef0615 100644
--- a/findKey.js
+++ b/findKey.js
@@ -21,15 +21,15 @@ define(['./_baseFind', './_baseForOwn', './_baseIteratee'], function(baseFind, b
    * _.findKey(users, function(o) { return o.age < 40; });
    * // => 'barney' (iteration order is not guaranteed)
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findKey(users, { 'age': 1, 'active': true });
    * // => 'pebbles'
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findKey(users, ['active', false]);
    * // => 'fred'
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findKey(users, 'active');
    * // => 'barney'
    */
diff --git a/findLastIndex.js b/findLastIndex.js
index 17d08bf33..25124b375 100644
--- a/findLastIndex.js
+++ b/findLastIndex.js
@@ -21,15 +21,15 @@ define(['./_baseFindIndex', './_baseIteratee'], function(baseFindIndex, baseIter
    * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
    * // => 2
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findLastIndex(users, { 'user': 'barney', 'active': true });
    * // => 0
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findLastIndex(users, ['active', false]);
    * // => 2
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findLastIndex(users, 'active');
    * // => 0
    */
diff --git a/findLastKey.js b/findLastKey.js
index f452b0bea..4e5c9356c 100644
--- a/findLastKey.js
+++ b/findLastKey.js
@@ -21,15 +21,15 @@ define(['./_baseFind', './_baseForOwnRight', './_baseIteratee'], function(baseFi
    * _.findLastKey(users, function(o) { return o.age < 40; });
    * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.findLastKey(users, { 'age': 36, 'active': true });
    * // => 'barney'
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.findLastKey(users, ['active', false]);
    * // => 'fred'
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.findLastKey(users, 'active');
    * // => 'pebbles'
    */
diff --git a/flatMap.js b/flatMap.js
index f05b36390..766199337 100644
--- a/flatMap.js
+++ b/flatMap.js
@@ -1,16 +1,16 @@
-define(['./_arrayMap', './_baseFlatten', './_baseIteratee'], function(arrayMap, baseFlatten, baseIteratee) {
+define(['./_baseFlatten', './map'], function(baseFlatten, map) {
 
   /**
-   * Creates an array of flattened values by running each element in `array`
+   * Creates an array of flattened values by running each element in `collection`
    * through `iteratee` and concating its result to the other mapped values.
-   * The iteratee is invoked with three arguments: (value, index|key, array).
+   * The iteratee is invoked with three arguments: (value, index|key, collection).
    *
    * @static
    * @memberOf _
-   * @category Array
-   * @param {Array} array The array to iterate over.
+   * @category Collection
+   * @param {Array|Object} collection The collection to iterate over.
    * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration.
-   * @returns {Array} Returns the new array.
+   * @returns {Array} Returns the new flattened array.
    * @example
    *
    * function duplicate(n) {
@@ -20,9 +20,8 @@ define(['./_arrayMap', './_baseFlatten', './_baseIteratee'], function(arrayMap,
    * _.flatMap([1, 2], duplicate);
    * // => [1, 1, 2, 2]
    */
-  function flatMap(array, iteratee) {
-    var length = array ? array.length : 0;
-    return length ? baseFlatten(arrayMap(array, baseIteratee(iteratee, 3))) : [];
+  function flatMap(collection, iteratee) {
+    return baseFlatten(map(collection, iteratee));
   }
 
   return flatMap;
diff --git a/groupBy.js b/groupBy.js
index bfd42c01a..d1ea4ab4a 100644
--- a/groupBy.js
+++ b/groupBy.js
@@ -23,7 +23,7 @@ define(['./_createAggregator'], function(createAggregator) {
    * _.groupBy([6.1, 4.2, 6.3], Math.floor);
    * // => { '4': [4.2], '6': [6.1, 6.3] }
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.groupBy(['one', 'two', 'three'], 'length');
    * // => { '3': ['one', 'two'], '5': ['three'] }
    */
diff --git a/indexOf.js b/indexOf.js
index 546af4d64..de535b2db 100644
--- a/indexOf.js
+++ b/indexOf.js
@@ -7,8 +7,7 @@ define(['./_baseIndexOf', './toInteger'], function(baseIndexOf, toInteger) {
    * Gets the index at which the first occurrence of `value` is found in `array`
    * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
    * for equality comparisons. If `fromIndex` is negative, it's used as the offset
-   * from the end of `array`. If `array` is sorted providing `true` for `fromIndex`
-   * performs a faster binary search.
+   * from the end of `array`.
    *
    * @static
    * @memberOf _
@@ -22,7 +21,7 @@ define(['./_baseIndexOf', './toInteger'], function(baseIndexOf, toInteger) {
    * _.indexOf([1, 2, 1, 2], 2);
    * // => 1
    *
-   * // using `fromIndex`
+   * // Search from the `fromIndex`.
    * _.indexOf([1, 2, 1, 2], 2, 2);
    * // => 3
    */
diff --git a/intersectionBy.js b/intersectionBy.js
index f58b4a320..2a5eea52f 100644
--- a/intersectionBy.js
+++ b/intersectionBy.js
@@ -19,7 +19,7 @@ define(['./_arrayMap', './_baseIntersection', './_baseIteratee', './last', './re
    * _.intersectionBy([2.1, 1.2], [4.3, 2.4], Math.floor);
    * // => [2.1]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
    * // => [{ 'x': 1 }]
    */
diff --git a/iteratee.js b/iteratee.js
index 48c8bdeec..8c23415d9 100644
--- a/iteratee.js
+++ b/iteratee.js
@@ -1,4 +1,4 @@
-define(['./_baseIteratee', './isArray', './isObjectLike', './matches'], function(baseIteratee, isArray, isObjectLike, matches) {
+define(['./_baseClone', './_baseIteratee'], function(baseClone, baseIteratee) {
 
   /**
    * Creates a function that invokes `func` with the arguments of the created
@@ -18,7 +18,7 @@ define(['./_baseIteratee', './isArray', './isObjectLike', './matches'], function
    *   { 'user': 'fred',   'age': 40 }
    * ];
    *
-   * // create custom iteratee shorthands
+   * // Create custom iteratee shorthands.
    * _.iteratee = _.wrap(_.iteratee, function(callback, func) {
    *   var p = /^(\S+)\s*([<>])\s*(\S+)$/.exec(func);
    *   return !p ? callback(func) : function(object) {
@@ -30,9 +30,7 @@ define(['./_baseIteratee', './isArray', './isObjectLike', './matches'], function
    * // => [{ 'user': 'fred', 'age': 40 }]
    */
   function iteratee(func) {
-    return (isObjectLike(func) && !isArray(func))
-      ? matches(func)
-      : baseIteratee(func);
+    return baseIteratee(typeof func == 'function' ? func : baseClone(func, true));
   }
 
   return iteratee;
diff --git a/lastIndexOf.js b/lastIndexOf.js
index e22f21f3b..ae2dc71f8 100644
--- a/lastIndexOf.js
+++ b/lastIndexOf.js
@@ -23,7 +23,7 @@ define(['./_indexOfNaN', './toInteger'], function(indexOfNaN, toInteger) {
    * _.lastIndexOf([1, 2, 1, 2], 2);
    * // => 3
    *
-   * // using `fromIndex`
+   * // Search from the `fromIndex`.
    * _.lastIndexOf([1, 2, 1, 2], 2, 2);
    * // => 1
    */
diff --git a/main.js b/main.js
index 74c3dbac4..a1cbdf230 100644
--- a/main.js
+++ b/main.js
@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 4.1.0 (Custom Build) <https://lodash.com/>
+ * lodash 4.2.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash exports="amd" -d -o ./main.js`
  * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -13,7 +13,7 @@
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.1.0';
+  var VERSION = '4.2.0';
 
   /** Used to compose bitmasks for wrapper metadata. */
   var BIND_FLAG = 1,
@@ -394,11 +394,11 @@
    * @private
    * @param {Function} func The function to invoke.
    * @param {*} thisArg The `this` binding of `func`.
-   * @param {...*} [args] The arguments to invoke `func` with.
+   * @param {...*} args The arguments to invoke `func` with.
    * @returns {*} Returns the result of `func`.
    */
   function apply(func, thisArg, args) {
-    var length = args ? args.length : 0;
+    var length = args.length;
     switch (length) {
       case 0: return func.call(thisArg);
       case 1: return func.call(thisArg, args[0]);
@@ -838,7 +838,7 @@
         result = result === undefined ? current : (result + current);
       }
     }
-    return length ? result : 0;
+    return result;
   }
 
   /**
@@ -1251,14 +1251,14 @@
    * lodash.isFunction(lodash.bar);
    * // => true
    *
-   * // using `context` to mock `Date#getTime` use in `_.now`
+   * // Use `context` to mock `Date#getTime` use in `_.now`.
    * var mock = _.runInContext({
    *   'Date': function() {
    *     return { 'getTime': getTimeMock };
    *   }
    * });
    *
-   * // or creating a suped-up `defer` in Node.js
+   * // Create a suped-up `defer` in Node.js.
    * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
    */
   function runInContext(context) {
@@ -1448,11 +1448,11 @@
      *
      * var wrapped = _([1, 2, 3]);
      *
-     * // returns an unwrapped value
+     * // Returns an unwrapped value.
      * wrapped.reduce(_.add);
      * // => 6
      *
-     * // returns a wrapped value
+     * // Returns a wrapped value.
      * var squares = wrapped.map(square);
      *
      * _.isArray(squares);
@@ -5468,7 +5468,7 @@
      * _.differenceBy([3.1, 2.2, 1.3], [4.4, 2.5], Math.floor);
      * // => [3.1, 1.3]
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
      * // => [{ 'x': 2 }]
      */
@@ -5600,15 +5600,15 @@
      * _.dropRightWhile(users, function(o) { return !o.active; });
      * // => objects for ['barney']
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
      * // => objects for ['barney', 'fred']
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.dropRightWhile(users, ['active', false]);
      * // => objects for ['barney']
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.dropRightWhile(users, 'active');
      * // => objects for ['barney', 'fred', 'pebbles']
      */
@@ -5640,15 +5640,15 @@
      * _.dropWhile(users, function(o) { return !o.active; });
      * // => objects for ['pebbles']
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.dropWhile(users, { 'user': 'barney', 'active': false });
      * // => objects for ['fred', 'pebbles']
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.dropWhile(users, ['active', false]);
      * // => objects for ['pebbles']
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.dropWhile(users, 'active');
      * // => objects for ['barney', 'fred', 'pebbles']
      */
@@ -5719,15 +5719,15 @@
      * _.findIndex(users, function(o) { return o.user == 'barney'; });
      * // => 0
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.findIndex(users, { 'user': 'fred', 'active': false });
      * // => 1
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.findIndex(users, ['active', false]);
      * // => 0
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.findIndex(users, 'active');
      * // => 2
      */
@@ -5758,15 +5758,15 @@
      * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
      * // => 2
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.findLastIndex(users, { 'user': 'barney', 'active': true });
      * // => 0
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.findLastIndex(users, ['active', false]);
      * // => 2
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.findLastIndex(users, 'active');
      * // => 0
      */
@@ -5776,31 +5776,6 @@
         : -1;
     }
 
-    /**
-     * Creates an array of flattened values by running each element in `array`
-     * through `iteratee` and concating its result to the other mapped values.
-     * The iteratee is invoked with three arguments: (value, index|key, array).
-     *
-     * @static
-     * @memberOf _
-     * @category Array
-     * @param {Array} array The array to iterate over.
-     * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration.
-     * @returns {Array} Returns the new array.
-     * @example
-     *
-     * function duplicate(n) {
-     *   return [n, n];
-     * }
-     *
-     * _.flatMap([1, 2], duplicate);
-     * // => [1, 1, 2, 2]
-     */
-    function flatMap(array, iteratee) {
-      var length = array ? array.length : 0;
-      return length ? baseFlatten(arrayMap(array, getIteratee(iteratee, 3))) : [];
-    }
-
     /**
      * Flattens `array` a single level.
      *
@@ -5888,8 +5863,7 @@
      * Gets the index at which the first occurrence of `value` is found in `array`
      * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
      * for equality comparisons. If `fromIndex` is negative, it's used as the offset
-     * from the end of `array`. If `array` is sorted providing `true` for `fromIndex`
-     * performs a faster binary search.
+     * from the end of `array`.
      *
      * @static
      * @memberOf _
@@ -5903,7 +5877,7 @@
      * _.indexOf([1, 2, 1, 2], 2);
      * // => 1
      *
-     * // using `fromIndex`
+     * // Search from the `fromIndex`.
      * _.indexOf([1, 2, 1, 2], 2, 2);
      * // => 3
      */
@@ -5974,7 +5948,7 @@
      * _.intersectionBy([2.1, 1.2], [4.3, 2.4], Math.floor);
      * // => [2.1]
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }]
      */
@@ -6077,7 +6051,7 @@
      * _.lastIndexOf([1, 2, 1, 2], 2);
      * // => 3
      *
-     * // using `fromIndex`
+     * // Search from the `fromIndex`.
      * _.lastIndexOf([1, 2, 1, 2], 2, 2);
      * // => 1
      */
@@ -6353,7 +6327,7 @@
      * _.sortedIndexBy(['thirty', 'fifty'], 'forty', _.propertyOf(dict));
      * // => 1
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.sortedIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');
      * // => 0
      */
@@ -6421,7 +6395,7 @@
      * @returns {number} Returns the index at which `value` should be inserted into `array`.
      * @example
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.sortedLastIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');
      * // => 1
      */
@@ -6488,7 +6462,7 @@
      * @example
      *
      * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
-     * // => [1.1, 2.2]
+     * // => [1.1, 2.3]
      */
     function sortedUniqBy(array, iteratee) {
       return (array && array.length)
@@ -6601,15 +6575,15 @@
      * _.takeRightWhile(users, function(o) { return !o.active; });
      * // => objects for ['fred', 'pebbles']
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
      * // => objects for ['pebbles']
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.takeRightWhile(users, ['active', false]);
      * // => objects for ['fred', 'pebbles']
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.takeRightWhile(users, 'active');
      * // => []
      */
@@ -6641,15 +6615,15 @@
      * _.takeWhile(users, function(o) { return !o.active; });
      * // => objects for ['barney', 'fred']
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.takeWhile(users, { 'user': 'barney', 'active': false });
      * // => objects for ['barney']
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.takeWhile(users, ['active', false]);
      * // => objects for ['barney', 'fred']
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.takeWhile(users, 'active');
      * // => []
      */
@@ -6694,7 +6668,7 @@
      * _.unionBy([2.1, 1.2], [4.3, 2.4], Math.floor);
      * // => [2.1, 1.2, 4.3]
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
@@ -6771,7 +6745,7 @@
      * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
      * // => [2.1, 1.2]
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
@@ -6927,7 +6901,7 @@
      * _.xorBy([2.1, 1.2], [4.3, 2.4], Math.floor);
      * // => [1.2, 4.3]
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 2 }]
      */
@@ -7082,10 +7056,9 @@
     }
 
     /**
-     * This method invokes `interceptor` and returns `value`. The interceptor is
-     * invoked with one argument; (value). The purpose of this method is to "tap into"
-     * a method chain in order to perform operations on intermediate results within
-     * the chain.
+     * This method invokes `interceptor` and returns `value`. The interceptor
+     * is invoked with one argument; (value). The purpose of this method is to
+     * "tap into" a method chain in order to modify intermediate results.
      *
      * @static
      * @memberOf _
@@ -7097,6 +7070,7 @@
      *
      * _([1, 2, 3])
      *  .tap(function(array) {
+     *    // Mutate input array.
      *    array.pop();
      *  })
      *  .reverse()
@@ -7110,6 +7084,8 @@
 
     /**
      * This method is like `_.tap` except that it returns the result of `interceptor`.
+     * The purpose of this method is to "pass thru" values replacing intermediate
+     * results in a method chain.
      *
      * @static
      * @memberOf _
@@ -7185,11 +7161,11 @@
      *   { 'user': 'fred',   'age': 40 }
      * ];
      *
-     * // without explicit chaining
+     * // A sequence without explicit chaining.
      * _(users).head();
      * // => { 'user': 'barney', 'age': 36 }
      *
-     * // with explicit chaining
+     * // A sequence with explicit chaining.
      * _(users)
      *   .chain()
      *   .head()
@@ -7444,15 +7420,15 @@
      *   { 'user': 'fred',   'active': false }
      * ];
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.every(users, { 'user': 'barney', 'active': false });
      * // => false
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.every(users, ['active', false]);
      * // => true
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.every(users, 'active');
      * // => false
      */
@@ -7485,15 +7461,15 @@
      * _.filter(users, function(o) { return !o.active; });
      * // => objects for ['fred']
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.filter(users, { 'age': 36, 'active': true });
      * // => objects for ['barney']
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.filter(users, ['active', false]);
      * // => objects for ['fred']
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.filter(users, 'active');
      * // => objects for ['barney']
      */
@@ -7524,15 +7500,15 @@
      * _.find(users, function(o) { return o.age < 40; });
      * // => object for 'barney'
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.find(users, { 'age': 1, 'active': true });
      * // => object for 'pebbles'
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.find(users, ['active', false]);
      * // => object for 'fred'
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.find(users, 'active');
      * // => object for 'barney'
      */
@@ -7571,6 +7547,30 @@
       return baseFind(collection, predicate, baseEachRight);
     }
 
+    /**
+     * Creates an array of flattened values by running each element in `collection`
+     * through `iteratee` and concating its result to the other mapped values.
+     * The iteratee is invoked with three arguments: (value, index|key, collection).
+     *
+     * @static
+     * @memberOf _
+     * @category Collection
+     * @param {Array|Object} collection The collection to iterate over.
+     * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration.
+     * @returns {Array} Returns the new flattened array.
+     * @example
+     *
+     * function duplicate(n) {
+     *   return [n, n];
+     * }
+     *
+     * _.flatMap([1, 2], duplicate);
+     * // => [1, 1, 2, 2]
+     */
+    function flatMap(collection, iteratee) {
+      return baseFlatten(map(collection, iteratee));
+    }
+
     /**
      * Iterates over elements of `collection` invoking `iteratee` for each element.
      * The iteratee is invoked with three arguments: (value, index|key, collection).
@@ -7646,7 +7646,7 @@
      * _.groupBy([6.1, 4.2, 6.3], Math.floor);
      * // => { '4': [4.2], '6': [6.1, 6.3] }
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.groupBy(['one', 'two', 'three'], 'length');
      * // => { '3': ['one', 'two'], '5': ['three'] }
      */
@@ -7802,7 +7802,7 @@
      *   { 'user': 'fred' }
      * ];
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.map(users, 'user');
      * // => ['barney', 'fred']
      */
@@ -7834,7 +7834,7 @@
      *   { 'user': 'barney', 'age': 36 }
      * ];
      *
-     * // sort by `user` in ascending order and by `age` in descending order
+     * // Sort by `user` in ascending order and by `age` in descending order.
      * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
      * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
      */
@@ -7875,15 +7875,15 @@
      * _.partition(users, function(o) { return o.active; });
      * // => objects for [['fred'], ['barney', 'pebbles']]
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.partition(users, { 'age': 1, 'active': false });
      * // => objects for [['pebbles'], ['barney', 'fred']]
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.partition(users, ['active', false]);
      * // => objects for [['barney', 'pebbles'], ['fred']]
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.partition(users, 'active');
      * // => objects for [['fred'], ['barney', 'pebbles']]
      */
@@ -7980,15 +7980,15 @@
      * _.reject(users, function(o) { return !o.active; });
      * // => objects for ['fred']
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.reject(users, { 'age': 40, 'active': true });
      * // => objects for ['barney']
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.reject(users, ['active', false]);
      * // => objects for ['fred']
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.reject(users, 'active');
      * // => objects for ['barney']
      */
@@ -8127,15 +8127,15 @@
      *   { 'user': 'fred',   'active': false }
      * ];
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.some(users, { 'user': 'barney', 'active': false });
      * // => false
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.some(users, ['active', false]);
      * // => true
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.some(users, 'active');
      * // => true
      */
@@ -8335,7 +8335,7 @@
      * bound('!');
      * // => 'hi fred!'
      *
-     * // using placeholders
+     * // Bound with placeholders.
      * var bound = _.bind(greet, object, _, '!');
      * bound('hi');
      * // => 'hi fred!'
@@ -8388,7 +8388,7 @@
      * bound('!');
      * // => 'hiya fred!'
      *
-     * // using placeholders
+     * // Bound with placeholders.
      * var bound = _.bindKey(object, 'greet', _, '!');
      * bound('hi');
      * // => 'hiya fred!'
@@ -8438,7 +8438,7 @@
      * curried(1, 2, 3);
      * // => [1, 2, 3]
      *
-     * // using placeholders
+     * // Curried with placeholders.
      * curried(1)(_, 3)(2);
      * // => [1, 2, 3]
      */
@@ -8482,7 +8482,7 @@
      * curried(1, 2, 3);
      * // => [1, 2, 3]
      *
-     * // using placeholders
+     * // Curried with placeholders.
      * curried(3)(1, _)(2);
      * // => [1, 2, 3]
      */
@@ -8525,21 +8525,21 @@
      * @returns {Function} Returns the new debounced function.
      * @example
      *
-     * // avoid costly calculations while the window size is in flux
+     * // Avoid costly calculations while the window size is in flux.
      * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
      *
-     * // invoke `sendMail` when clicked, debouncing subsequent calls
+     * // Invoke `sendMail` when clicked, debouncing subsequent calls.
      * jQuery(element).on('click', _.debounce(sendMail, 300, {
      *   'leading': true,
      *   'trailing': false
      * }));
      *
-     * // ensure `batchLog` is invoked once after 1 second of debounced calls
+     * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
      * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
      * var source = new EventSource('/stream');
      * jQuery(source).on('message', debounced);
      *
-     * // cancel a trailing debounced invocation
+     * // Cancel the trailing debounced invocation.
      * jQuery(window).on('popstate', debounced.cancel);
      */
     function debounce(func, wait, options) {
@@ -8672,7 +8672,7 @@
      * _.defer(function(text) {
      *   console.log(text);
      * }, 'deferred');
-     * // logs 'deferred' after one or more milliseconds
+     * // => logs 'deferred' after one or more milliseconds
      */
     var defer = rest(function(func, args) {
       return baseDelay(func, 1, args);
@@ -8755,12 +8755,12 @@
      * values(object);
      * // => [1, 2]
      *
-     * // modifying the result cache
+     * // Modify the result cache.
      * values.cache.set(object, ['a', 'b']);
      * values(object);
      * // => ['a', 'b']
      *
-     * // replacing `_.memoize.Cache`
+     * // Replace `_.memoize.Cache`.
      * _.memoize.Cache = WeakMap;
      */
     function memoize(func, resolver) {
@@ -8905,7 +8905,7 @@
      * sayHelloTo('fred');
      * // => 'hello fred'
      *
-     * // using placeholders
+     * // Partially applied with placeholders.
      * var greetFred = _.partial(greet, _, 'fred');
      * greetFred('hi');
      * // => 'hi fred'
@@ -8941,7 +8941,7 @@
      * greetFred('hi');
      * // => 'hi fred'
      *
-     * // using placeholders
+     * // Partially applied with placeholders.
      * var sayHelloTo = _.partialRight(greet, 'hello', _);
      * sayHelloTo('fred');
      * // => 'hello fred'
@@ -9038,6 +9038,7 @@
      * @memberOf _
      * @category Function
      * @param {Function} func The function to spread arguments over.
+     * @param {number} [start=0] The start position of the spread.
      * @returns {Function} Returns the new function.
      * @example
      *
@@ -9048,7 +9049,6 @@
      * say(['fred', 'hello']);
      * // => 'fred says hello'
      *
-     * // with a Promise
      * var numbers = Promise.all([
      *   Promise.resolve(40),
      *   Promise.resolve(36)
@@ -9059,13 +9059,20 @@
      * }));
      * // => a Promise of 76
      */
-    function spread(func) {
+    function spread(func, start) {
       if (typeof func != 'function') {
         throw new TypeError(FUNC_ERROR_TEXT);
       }
-      return function(array) {
-        return apply(func, this, array);
-      };
+      start = start === undefined ? 0 : nativeMax(toInteger(start), 0);
+      return rest(function(args) {
+        var array = args[start],
+            otherArgs = args.slice(0, start);
+
+        if (array) {
+          arrayPush(otherArgs, array);
+        }
+        return apply(func, this, otherArgs);
+      });
     }
 
     /**
@@ -9098,14 +9105,14 @@
      * @returns {Function} Returns the new throttled function.
      * @example
      *
-     * // avoid excessively updating the position while scrolling
+     * // Avoid excessively updating the position while scrolling.
      * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
      *
-     * // invoke `renewToken` when the click event is fired, but not more than once every 5 minutes
+     * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
      * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
      * jQuery(element).on('click', throttled);
      *
-     * // cancel a trailing throttled invocation
+     * // Cancel the trailing throttled invocation.
      * jQuery(window).on('popstate', throttled.cancel);
      */
     function throttle(func, wait, options) {
@@ -10724,15 +10731,15 @@
      * _.findKey(users, function(o) { return o.age < 40; });
      * // => 'barney' (iteration order is not guaranteed)
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.findKey(users, { 'age': 1, 'active': true });
      * // => 'pebbles'
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.findKey(users, ['active', false]);
      * // => 'fred'
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.findKey(users, 'active');
      * // => 'barney'
      */
@@ -10761,15 +10768,15 @@
      * _.findLastKey(users, function(o) { return o.age < 40; });
      * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
      *
-     * // using the `_.matches` iteratee shorthand
+     * // The `_.matches` iteratee shorthand.
      * _.findLastKey(users, { 'age': 36, 'active': true });
      * // => 'barney'
      *
-     * // using the `_.matchesProperty` iteratee shorthand
+     * // The `_.matchesProperty` iteratee shorthand.
      * _.findLastKey(users, ['active', false]);
      * // => 'fred'
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.findLastKey(users, 'active');
      * // => 'pebbles'
      */
@@ -11242,7 +11249,7 @@
      * _.mapValues(users, function(o) { return o.age; });
      * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.mapValues(users, 'age');
      * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
      */
@@ -11296,6 +11303,8 @@
      * method instead. The `customizer` is invoked with seven arguments:
      * (objValue, srcValue, key, object, source, stack).
      *
+     * **Note:** This method mutates `object`.
+     *
      * @static
      * @memberOf _
      * @category Object
@@ -11402,7 +11411,7 @@
 
     /**
      * Creates an object composed of the `object` properties `predicate` returns
-     * truthy for. The predicate is invoked with one argument: (value).
+     * truthy for. The predicate is invoked with two arguments: (value, key).
      *
      * @static
      * @memberOf _
@@ -11469,6 +11478,8 @@
      * are created for all other missing properties. Use `_.setWith` to customize
      * `path` creation.
      *
+     * **Note:** This method mutates `object`.
+     *
      * @static
      * @memberOf _
      * @category Object
@@ -11498,6 +11509,8 @@
      * path creation is handled by the method instead. The `customizer` is invoked
      * with three arguments: (nsValue, key, nsObject).
      *
+     * **Note:** This method mutates `object`.
+     *
      * @static
      * @memberOf _
      * @category Object
@@ -11617,6 +11630,8 @@
     /**
      * Removes the property at `path` of `object`.
      *
+     * **Note:** This method mutates `object`.
+     *
      * @static
      * @memberOf _
      * @category Object
@@ -12406,54 +12421,54 @@
      * @returns {Function} Returns the compiled template function.
      * @example
      *
-     * // using the "interpolate" delimiter to create a compiled template
+     * // Use the "interpolate" delimiter to create a compiled template.
      * var compiled = _.template('hello <%= user %>!');
      * compiled({ 'user': 'fred' });
      * // => 'hello fred!'
      *
-     * // using the HTML "escape" delimiter to escape data property values
+     * // Use the HTML "escape" delimiter to escape data property values.
      * var compiled = _.template('<b><%- value %></b>');
      * compiled({ 'value': '<script>' });
      * // => '<b>&lt;script&gt;</b>'
      *
-     * // using the "evaluate" delimiter to execute JavaScript and generate HTML
+     * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
      * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
      * compiled({ 'users': ['fred', 'barney'] });
      * // => '<li>fred</li><li>barney</li>'
      *
-     * // using the internal `print` function in "evaluate" delimiters
+     * // Use the internal `print` function in "evaluate" delimiters.
      * var compiled = _.template('<% print("hello " + user); %>!');
      * compiled({ 'user': 'barney' });
      * // => 'hello barney!'
      *
-     * // using the ES delimiter as an alternative to the default "interpolate" delimiter
+     * // Use the ES delimiter as an alternative to the default "interpolate" delimiter.
      * var compiled = _.template('hello ${ user }!');
      * compiled({ 'user': 'pebbles' });
      * // => 'hello pebbles!'
      *
-     * // using custom template delimiters
+     * // Use custom template delimiters.
      * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
      * var compiled = _.template('hello {{ user }}!');
      * compiled({ 'user': 'mustache' });
      * // => 'hello mustache!'
      *
-     * // using backslashes to treat delimiters as plain text
+     * // Use backslashes to treat delimiters as plain text.
      * var compiled = _.template('<%= "\\<%- value %\\>" %>');
      * compiled({ 'value': 'ignored' });
      * // => '<%- value %>'
      *
-     * // using the `imports` option to import `jQuery` as `jq`
+     * // Use the `imports` option to import `jQuery` as `jq`.
      * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
      * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
      * compiled({ 'users': ['fred', 'barney'] });
      * // => '<li>fred</li><li>barney</li>'
      *
-     * // using the `sourceURL` option to specify a custom sourceURL for the template
+     * // Use the `sourceURL` option to specify a custom sourceURL for the template.
      * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
      * compiled(data);
      * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
      *
-     * // using the `variable` option to ensure a with-statement isn't used in the compiled template
+     * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
      * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
      * compiled.source;
      * // => function(data) {
@@ -12462,8 +12477,8 @@
      * //   return __p;
      * // }
      *
-     * // using the `source` property to inline compiled templates for meaningful
-     * // line numbers in error messages and a stack trace
+     * // Use the `source` property to inline compiled templates for meaningful
+     * // line numbers in error messages and stack traces.
      * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
      *   var JST = {\
      *     "main": ' + _.template(mainText).source + '\
@@ -12910,7 +12925,7 @@
      * @returns {*} Returns the `func` result or error object.
      * @example
      *
-     * // avoid throwing errors for invalid selectors
+     * // Avoid throwing errors for invalid selectors.
      * var elements = _.attempt(function(selector) {
      *   return document.querySelectorAll(selector);
      * }, '>_>');
@@ -12923,7 +12938,7 @@
       try {
         return apply(func, undefined, args);
       } catch (e) {
-        return isError(e) ? e : new Error(e);
+        return isObject(e) ? e : new Error(e);
       }
     });
 
@@ -13136,7 +13151,7 @@
      *   { 'user': 'fred',   'age': 40 }
      * ];
      *
-     * // create custom iteratee shorthands
+     * // Create custom iteratee shorthands.
      * _.iteratee = _.wrap(_.iteratee, function(callback, func) {
      *   var p = /^(\S+)\s*([<>])\s*(\S+)$/.exec(func);
      *   return !p ? callback(func) : function(object) {
@@ -13148,9 +13163,7 @@
      * // => [{ 'user': 'fred', 'age': 40 }]
      */
     function iteratee(func) {
-      return (isObjectLike(func) && !isArray(func))
-        ? matches(func)
-        : baseIteratee(func);
+      return baseIteratee(typeof func == 'function' ? func : baseClone(func, true));
     }
 
     /**
@@ -13786,7 +13799,7 @@
      * _.maxBy(objects, function(o) { return o.n; });
      * // => { 'n': 2 }
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.maxBy(objects, 'n');
      * // => { 'n': 2 }
      */
@@ -13854,7 +13867,7 @@
      * _.minBy(objects, function(o) { return o.n; });
      * // => { 'n': 1 }
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.minBy(objects, 'n');
      * // => { 'n': 1 }
      */
@@ -13948,7 +13961,7 @@
      * _.sumBy(objects, function(o) { return o.n; });
      * // => 20
      *
-     * // using the `_.property` iteratee shorthand
+     * // The `_.property` iteratee shorthand.
      * _.sumBy(objects, 'n');
      * // => 20
      */
diff --git a/map.js b/map.js
index 78e47bd76..0d37011fc 100644
--- a/map.js
+++ b/map.js
@@ -37,7 +37,7 @@ define(['./_arrayMap', './_baseIteratee', './_baseMap', './isArray'], function(a
    *   { 'user': 'fred' }
    * ];
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.map(users, 'user');
    * // => ['barney', 'fred']
    */
diff --git a/mapValues.js b/mapValues.js
index c1dc210ee..5587f14f6 100644
--- a/mapValues.js
+++ b/mapValues.js
@@ -21,7 +21,7 @@ define(['./_baseForOwn', './_baseIteratee'], function(baseForOwn, baseIteratee)
    * _.mapValues(users, function(o) { return o.age; });
    * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.mapValues(users, 'age');
    * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
    */
diff --git a/maxBy.js b/maxBy.js
index 95e9cb530..794fb8b47 100644
--- a/maxBy.js
+++ b/maxBy.js
@@ -21,7 +21,7 @@ define(['./_baseExtremum', './_baseIteratee', './gt'], function(baseExtremum, ba
    * _.maxBy(objects, function(o) { return o.n; });
    * // => { 'n': 2 }
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.maxBy(objects, 'n');
    * // => { 'n': 2 }
    */
diff --git a/memoize.js b/memoize.js
index 81dc6e32f..587899031 100644
--- a/memoize.js
+++ b/memoize.js
@@ -37,12 +37,12 @@ define(['./_MapCache'], function(MapCache) {
    * values(object);
    * // => [1, 2]
    *
-   * // modifying the result cache
+   * // Modify the result cache.
    * values.cache.set(object, ['a', 'b']);
    * values(object);
    * // => ['a', 'b']
    *
-   * // replacing `_.memoize.Cache`
+   * // Replace `_.memoize.Cache`.
    * _.memoize.Cache = WeakMap;
    */
   function memoize(func, resolver) {
diff --git a/mergeWith.js b/mergeWith.js
index b6bd13bf6..326edb4c3 100644
--- a/mergeWith.js
+++ b/mergeWith.js
@@ -7,6 +7,8 @@ define(['./_baseMerge', './_createAssigner'], function(baseMerge, createAssigner
    * method instead. The `customizer` is invoked with seven arguments:
    * (objValue, srcValue, key, object, source, stack).
    *
+   * **Note:** This method mutates `object`.
+   *
    * @static
    * @memberOf _
    * @category Object
diff --git a/minBy.js b/minBy.js
index 7438531b5..652286c01 100644
--- a/minBy.js
+++ b/minBy.js
@@ -21,7 +21,7 @@ define(['./_baseExtremum', './_baseIteratee', './lt'], function(baseExtremum, ba
    * _.minBy(objects, function(o) { return o.n; });
    * // => { 'n': 1 }
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.minBy(objects, 'n');
    * // => { 'n': 1 }
    */
diff --git a/orderBy.js b/orderBy.js
index 60786b4a0..3257021b7 100644
--- a/orderBy.js
+++ b/orderBy.js
@@ -26,7 +26,7 @@ define(['./_baseOrderBy', './isArray'], function(baseOrderBy, isArray) {
    *   { 'user': 'barney', 'age': 36 }
    * ];
    *
-   * // sort by `user` in ascending order and by `age` in descending order
+   * // Sort by `user` in ascending order and by `age` in descending order.
    * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
    * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]]
    */
diff --git a/package.json b/package.json
index 7fc9b6705..835876ba3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash-amd",
-  "version": "4.1.0",
+  "version": "4.2.0",
   "description": "Lodash exported as AMD modules.",
   "homepage": "https://lodash.com/custom-builds",
   "license": "MIT",
diff --git a/partial.js b/partial.js
index ebb467fca..6850add55 100644
--- a/partial.js
+++ b/partial.js
@@ -33,7 +33,7 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
    * sayHelloTo('fred');
    * // => 'hello fred'
    *
-   * // using placeholders
+   * // Partially applied with placeholders.
    * var greetFred = _.partial(greet, _, 'fred');
    * greetFred('hi');
    * // => 'hi fred'
diff --git a/partialRight.js b/partialRight.js
index a05951b96..5198b051b 100644
--- a/partialRight.js
+++ b/partialRight.js
@@ -32,7 +32,7 @@ define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapp
    * greetFred('hi');
    * // => 'hi fred'
    *
-   * // using placeholders
+   * // Partially applied with placeholders.
    * var sayHelloTo = _.partialRight(greet, 'hello', _);
    * sayHelloTo('fred');
    * // => 'hello fred'
diff --git a/partition.js b/partition.js
index ce154a3d9..8702e9829 100644
--- a/partition.js
+++ b/partition.js
@@ -23,15 +23,15 @@ define(['./_createAggregator'], function(createAggregator) {
    * _.partition(users, function(o) { return o.active; });
    * // => objects for [['fred'], ['barney', 'pebbles']]
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.partition(users, { 'age': 1, 'active': false });
    * // => objects for [['pebbles'], ['barney', 'fred']]
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.partition(users, ['active', false]);
    * // => objects for [['barney', 'pebbles'], ['fred']]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.partition(users, 'active');
    * // => objects for [['fred'], ['barney', 'pebbles']]
    */
diff --git a/pickBy.js b/pickBy.js
index 48b114f9a..d42c043be 100644
--- a/pickBy.js
+++ b/pickBy.js
@@ -2,7 +2,7 @@ define(['./_baseIteratee', './_basePickBy'], function(baseIteratee, basePickBy)
 
   /**
    * Creates an object composed of the `object` properties `predicate` returns
-   * truthy for. The predicate is invoked with one argument: (value).
+   * truthy for. The predicate is invoked with two arguments: (value, key).
    *
    * @static
    * @memberOf _
diff --git a/reject.js b/reject.js
index 9540faf8e..86785c66d 100644
--- a/reject.js
+++ b/reject.js
@@ -20,15 +20,15 @@ define(['./_arrayFilter', './_baseFilter', './_baseIteratee', './isArray'], func
    * _.reject(users, function(o) { return !o.active; });
    * // => objects for ['fred']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.reject(users, { 'age': 40, 'active': true });
    * // => objects for ['barney']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.reject(users, ['active', false]);
    * // => objects for ['fred']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.reject(users, 'active');
    * // => objects for ['barney']
    */
diff --git a/set.js b/set.js
index 5f4fbc04c..1f3aae4b8 100644
--- a/set.js
+++ b/set.js
@@ -6,6 +6,8 @@ define(['./_baseSet'], function(baseSet) {
    * are created for all other missing properties. Use `_.setWith` to customize
    * `path` creation.
    *
+   * **Note:** This method mutates `object`.
+   *
    * @static
    * @memberOf _
    * @category Object
diff --git a/setWith.js b/setWith.js
index b51cfc2f8..fda1037fb 100644
--- a/setWith.js
+++ b/setWith.js
@@ -9,6 +9,8 @@ define(['./_baseSet'], function(baseSet) {
    * path creation is handled by the method instead. The `customizer` is invoked
    * with three arguments: (nsValue, key, nsObject).
    *
+   * **Note:** This method mutates `object`.
+   *
    * @static
    * @memberOf _
    * @category Object
diff --git a/some.js b/some.js
index 61642b153..8cfbb2e90 100644
--- a/some.js
+++ b/some.js
@@ -25,15 +25,15 @@ define(['./_arraySome', './_baseIteratee', './_baseSome', './isArray', './_isIte
    *   { 'user': 'fred',   'active': false }
    * ];
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.some(users, { 'user': 'barney', 'active': false });
    * // => false
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.some(users, ['active', false]);
    * // => true
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.some(users, 'active');
    * // => true
    */
diff --git a/sortedIndexBy.js b/sortedIndexBy.js
index b459ba3c3..b647f9f23 100644
--- a/sortedIndexBy.js
+++ b/sortedIndexBy.js
@@ -19,7 +19,7 @@ define(['./_baseIteratee', './_baseSortedIndexBy'], function(baseIteratee, baseS
    * _.sortedIndexBy(['thirty', 'fifty'], 'forty', _.propertyOf(dict));
    * // => 1
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.sortedIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');
    * // => 0
    */
diff --git a/sortedLastIndexBy.js b/sortedLastIndexBy.js
index a23c43f74..56637e483 100644
--- a/sortedLastIndexBy.js
+++ b/sortedLastIndexBy.js
@@ -14,7 +14,7 @@ define(['./_baseIteratee', './_baseSortedIndexBy'], function(baseIteratee, baseS
    * @returns {number} Returns the index at which `value` should be inserted into `array`.
    * @example
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.sortedLastIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');
    * // => 1
    */
diff --git a/sortedUniqBy.js b/sortedUniqBy.js
index d7c062835..adcd7a2ba 100644
--- a/sortedUniqBy.js
+++ b/sortedUniqBy.js
@@ -13,7 +13,7 @@ define(['./_baseIteratee', './_baseSortedUniqBy'], function(baseIteratee, baseSo
    * @example
    *
    * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
-   * // => [1.1, 2.2]
+   * // => [1.1, 2.3]
    */
   function sortedUniqBy(array, iteratee) {
     return (array && array.length)
diff --git a/spread.js b/spread.js
index 10ca9d2c5..c4538b19a 100644
--- a/spread.js
+++ b/spread.js
@@ -1,8 +1,14 @@
-define(['./_apply'], function(apply) {
+define(['./_apply', './_arrayPush', './rest', './toInteger'], function(apply, arrayPush, rest, toInteger) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
 
   /** Used as the `TypeError` message for "Functions" methods. */
   var FUNC_ERROR_TEXT = 'Expected a function';
 
+  /* Built-in method references for those with the same name as other `lodash` methods. */
+  var nativeMax = Math.max;
+
   /**
    * Creates a function that invokes `func` with the `this` binding of the created
    * function and an array of arguments much like [`Function#apply`](https://es5.github.io/#x15.3.4.3).
@@ -13,6 +19,7 @@ define(['./_apply'], function(apply) {
    * @memberOf _
    * @category Function
    * @param {Function} func The function to spread arguments over.
+   * @param {number} [start=0] The start position of the spread.
    * @returns {Function} Returns the new function.
    * @example
    *
@@ -23,7 +30,6 @@ define(['./_apply'], function(apply) {
    * say(['fred', 'hello']);
    * // => 'fred says hello'
    *
-   * // with a Promise
    * var numbers = Promise.all([
    *   Promise.resolve(40),
    *   Promise.resolve(36)
@@ -34,13 +40,20 @@ define(['./_apply'], function(apply) {
    * }));
    * // => a Promise of 76
    */
-  function spread(func) {
+  function spread(func, start) {
     if (typeof func != 'function') {
       throw new TypeError(FUNC_ERROR_TEXT);
     }
-    return function(array) {
-      return apply(func, this, array);
-    };
+    start = start === undefined ? 0 : nativeMax(toInteger(start), 0);
+    return rest(function(args) {
+      var array = args[start],
+          otherArgs = args.slice(0, start);
+
+      if (array) {
+        arrayPush(otherArgs, array);
+      }
+      return apply(func, this, otherArgs);
+    });
   }
 
   return spread;
diff --git a/sumBy.js b/sumBy.js
index cadd17f03..ee96275b8 100644
--- a/sumBy.js
+++ b/sumBy.js
@@ -18,7 +18,7 @@ define(['./_baseIteratee', './_baseSum'], function(baseIteratee, baseSum) {
    * _.sumBy(objects, function(o) { return o.n; });
    * // => 20
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.sumBy(objects, 'n');
    * // => 20
    */
diff --git a/takeRightWhile.js b/takeRightWhile.js
index a0e5c54bf..0967637b4 100644
--- a/takeRightWhile.js
+++ b/takeRightWhile.js
@@ -22,15 +22,15 @@ define(['./_baseIteratee', './_baseWhile'], function(baseIteratee, baseWhile) {
    * _.takeRightWhile(users, function(o) { return !o.active; });
    * // => objects for ['fred', 'pebbles']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
    * // => objects for ['pebbles']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.takeRightWhile(users, ['active', false]);
    * // => objects for ['fred', 'pebbles']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.takeRightWhile(users, 'active');
    * // => []
    */
diff --git a/takeWhile.js b/takeWhile.js
index d47e5c1d3..2173b2b68 100644
--- a/takeWhile.js
+++ b/takeWhile.js
@@ -22,15 +22,15 @@ define(['./_baseIteratee', './_baseWhile'], function(baseIteratee, baseWhile) {
    * _.takeWhile(users, function(o) { return !o.active; });
    * // => objects for ['barney', 'fred']
    *
-   * // using the `_.matches` iteratee shorthand
+   * // The `_.matches` iteratee shorthand.
    * _.takeWhile(users, { 'user': 'barney', 'active': false });
    * // => objects for ['barney']
    *
-   * // using the `_.matchesProperty` iteratee shorthand
+   * // The `_.matchesProperty` iteratee shorthand.
    * _.takeWhile(users, ['active', false]);
    * // => objects for ['barney', 'fred']
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.takeWhile(users, 'active');
    * // => []
    */
diff --git a/tap.js b/tap.js
index c6d1478e9..98e02e125 100644
--- a/tap.js
+++ b/tap.js
@@ -1,10 +1,9 @@
 define([], function() {
 
   /**
-   * This method invokes `interceptor` and returns `value`. The interceptor is
-   * invoked with one argument; (value). The purpose of this method is to "tap into"
-   * a method chain in order to perform operations on intermediate results within
-   * the chain.
+   * This method invokes `interceptor` and returns `value`. The interceptor
+   * is invoked with one argument; (value). The purpose of this method is to
+   * "tap into" a method chain in order to modify intermediate results.
    *
    * @static
    * @memberOf _
@@ -16,6 +15,7 @@ define([], function() {
    *
    * _([1, 2, 3])
    *  .tap(function(array) {
+   *    // Mutate input array.
    *    array.pop();
    *  })
    *  .reverse()
diff --git a/template.js b/template.js
index 35ed4701a..04fe6aa14 100644
--- a/template.js
+++ b/template.js
@@ -49,54 +49,54 @@ define(['./_assignInDefaults', './assignInWith', './attempt', './_baseValues', '
    * @returns {Function} Returns the compiled template function.
    * @example
    *
-   * // using the "interpolate" delimiter to create a compiled template
+   * // Use the "interpolate" delimiter to create a compiled template.
    * var compiled = _.template('hello <%= user %>!');
    * compiled({ 'user': 'fred' });
    * // => 'hello fred!'
    *
-   * // using the HTML "escape" delimiter to escape data property values
+   * // Use the HTML "escape" delimiter to escape data property values.
    * var compiled = _.template('<b><%- value %></b>');
    * compiled({ 'value': '<script>' });
    * // => '<b>&lt;script&gt;</b>'
    *
-   * // using the "evaluate" delimiter to execute JavaScript and generate HTML
+   * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
    * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
    * compiled({ 'users': ['fred', 'barney'] });
    * // => '<li>fred</li><li>barney</li>'
    *
-   * // using the internal `print` function in "evaluate" delimiters
+   * // Use the internal `print` function in "evaluate" delimiters.
    * var compiled = _.template('<% print("hello " + user); %>!');
    * compiled({ 'user': 'barney' });
    * // => 'hello barney!'
    *
-   * // using the ES delimiter as an alternative to the default "interpolate" delimiter
+   * // Use the ES delimiter as an alternative to the default "interpolate" delimiter.
    * var compiled = _.template('hello ${ user }!');
    * compiled({ 'user': 'pebbles' });
    * // => 'hello pebbles!'
    *
-   * // using custom template delimiters
+   * // Use custom template delimiters.
    * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
    * var compiled = _.template('hello {{ user }}!');
    * compiled({ 'user': 'mustache' });
    * // => 'hello mustache!'
    *
-   * // using backslashes to treat delimiters as plain text
+   * // Use backslashes to treat delimiters as plain text.
    * var compiled = _.template('<%= "\\<%- value %\\>" %>');
    * compiled({ 'value': 'ignored' });
    * // => '<%- value %>'
    *
-   * // using the `imports` option to import `jQuery` as `jq`
+   * // Use the `imports` option to import `jQuery` as `jq`.
    * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
    * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
    * compiled({ 'users': ['fred', 'barney'] });
    * // => '<li>fred</li><li>barney</li>'
    *
-   * // using the `sourceURL` option to specify a custom sourceURL for the template
+   * // Use the `sourceURL` option to specify a custom sourceURL for the template.
    * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
    * compiled(data);
    * // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
    *
-   * // using the `variable` option to ensure a with-statement isn't used in the compiled template
+   * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
    * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
    * compiled.source;
    * // => function(data) {
@@ -105,8 +105,8 @@ define(['./_assignInDefaults', './assignInWith', './attempt', './_baseValues', '
    * //   return __p;
    * // }
    *
-   * // using the `source` property to inline compiled templates for meaningful
-   * // line numbers in error messages and a stack trace
+   * // Use the `source` property to inline compiled templates for meaningful
+   * // line numbers in error messages and stack traces.
    * fs.writeFileSync(path.join(cwd, 'jst.js'), '\
    *   var JST = {\
    *     "main": ' + _.template(mainText).source + '\
diff --git a/throttle.js b/throttle.js
index bafd50d7d..01cba010b 100644
--- a/throttle.js
+++ b/throttle.js
@@ -33,14 +33,14 @@ define(['./debounce', './isObject'], function(debounce, isObject) {
    * @returns {Function} Returns the new throttled function.
    * @example
    *
-   * // avoid excessively updating the position while scrolling
+   * // Avoid excessively updating the position while scrolling.
    * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
    *
-   * // invoke `renewToken` when the click event is fired, but not more than once every 5 minutes
+   * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
    * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
    * jQuery(element).on('click', throttled);
    *
-   * // cancel a trailing throttled invocation
+   * // Cancel the trailing throttled invocation.
    * jQuery(window).on('popstate', throttled.cancel);
    */
   function throttle(func, wait, options) {
diff --git a/thru.js b/thru.js
index 33c4db8ef..d97b1a37b 100644
--- a/thru.js
+++ b/thru.js
@@ -2,6 +2,8 @@ define([], function() {
 
   /**
    * This method is like `_.tap` except that it returns the result of `interceptor`.
+   * The purpose of this method is to "pass thru" values replacing intermediate
+   * results in a method chain.
    *
    * @static
    * @memberOf _
diff --git a/unionBy.js b/unionBy.js
index b3d99fe31..4c3debeca 100644
--- a/unionBy.js
+++ b/unionBy.js
@@ -19,7 +19,7 @@ define(['./_baseFlatten', './_baseIteratee', './_baseUniq', './isArrayLikeObject
    * _.unionBy([2.1, 1.2], [4.3, 2.4], Math.floor);
    * // => [2.1, 1.2, 4.3]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
    * // => [{ 'x': 1 }, { 'x': 2 }]
    */
diff --git a/uniqBy.js b/uniqBy.js
index 492e64dde..8460af2bc 100644
--- a/uniqBy.js
+++ b/uniqBy.js
@@ -16,7 +16,7 @@ define(['./_baseIteratee', './_baseUniq'], function(baseIteratee, baseUniq) {
    * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
    * // => [2.1, 1.2]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
    * // => [{ 'x': 1 }, { 'x': 2 }]
    */
diff --git a/unset.js b/unset.js
index 4c43c5579..e3b5e8461 100644
--- a/unset.js
+++ b/unset.js
@@ -3,6 +3,8 @@ define(['./_baseUnset'], function(baseUnset) {
   /**
    * Removes the property at `path` of `object`.
    *
+   * **Note:** This method mutates `object`.
+   *
    * @static
    * @memberOf _
    * @category Object
diff --git a/wrapperChain.js b/wrapperChain.js
index 850507c64..7a10e6eee 100644
--- a/wrapperChain.js
+++ b/wrapperChain.js
@@ -14,11 +14,11 @@ define(['./chain'], function(chain) {
    *   { 'user': 'fred',   'age': 40 }
    * ];
    *
-   * // without explicit chaining
+   * // A sequence without explicit chaining.
    * _(users).head();
    * // => { 'user': 'barney', 'age': 36 }
    *
-   * // with explicit chaining
+   * // A sequence with explicit chaining.
    * _(users)
    *   .chain()
    *   .head()
diff --git a/wrapperLodash.js b/wrapperLodash.js
index cb116c90d..ed361eb81 100644
--- a/wrapperLodash.js
+++ b/wrapperLodash.js
@@ -104,11 +104,11 @@ define(['./_LazyWrapper', './_LodashWrapper', './_baseLodash', './isArray', './i
    *
    * var wrapped = _([1, 2, 3]);
    *
-   * // returns an unwrapped value
+   * // Returns an unwrapped value.
    * wrapped.reduce(_.add);
    * // => 6
    *
-   * // returns a wrapped value
+   * // Returns a wrapped value.
    * var squares = wrapped.map(square);
    *
    * _.isArray(squares);
diff --git a/xorBy.js b/xorBy.js
index e2e8d0377..dcc56cb39 100644
--- a/xorBy.js
+++ b/xorBy.js
@@ -19,7 +19,7 @@ define(['./_arrayFilter', './_baseIteratee', './_baseXor', './isArrayLikeObject'
    * _.xorBy([2.1, 1.2], [4.3, 2.4], Math.floor);
    * // => [1.2, 4.3]
    *
-   * // using the `_.property` iteratee shorthand
+   * // The `_.property` iteratee shorthand.
    * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
    * // => [{ 'x': 2 }]
    */