Bump to v3.2.0.

function/after.js

@@ -1,5 +1,3 @@
-var isFunction = require('../lang/isFunction');
-
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
@@ -30,8 +28,8 @@ var nativeIsFinite = global.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 @@
-var isFunction = require('../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/debounce.js

@@ -1,5 +1,4 @@
-var isFunction = require('../lang/isFunction'),
-    isObject = require('../lang/isObject'),
+var isObject = require('../lang/isObject'),
     now = require('../date/now');
 
 /** Used as the `TypeError` message for "Functions" methods. */
@@ -82,7 +81,7 @@ 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;

function/flow.js

@@ -33,7 +33,7 @@ function flow() {
       length = funcs.length;
 
   if (!length) {
-    return function() {};
+    return function() { return arguments[0]; };
   }
   if (!arrayEvery(funcs, isFunction)) {
     throw new TypeError(FUNC_ERROR_TEXT);

function/flowRight.js

@@ -33,7 +33,7 @@ function flowRight() {
       fromIndex = funcs.length - 1;
 
   if (fromIndex < 0) {
-    return function() {};
+    return function() { return arguments[0]; };
   }
   if (!arrayEvery(funcs, isFunction)) {
     throw new TypeError(FUNC_ERROR_TEXT);

function/memoize.js

@@ -1,5 +1,4 @@
-var MapCache = require('../internal/MapCache'),
-    isFunction = require('../lang/isFunction');
+var MapCache = require('../internal/MapCache');
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
@@ -58,7 +57,7 @@ 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() {

function/negate.js

@@ -1,5 +1,3 @@
-var isFunction = require('../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 @@ var before = require('./before');
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Function
  * @param {Function} func The function to restrict.
  * @returns {Function} Returns the new restricted function.

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);
+  };
+}
+
+module.exports = spread;

function/throttle.js

@@ -1,5 +1,4 @@
 var debounce = require('./debounce'),
-    isFunction = require('../lang/isFunction'),
     isObject = require('../lang/isObject');
 
 /** Used as the `TypeError` message for "Functions" methods. */
@@ -54,7 +53,7 @@ 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) {