From 0a2dd2a3302fe85d3cff0a8387bf179c4d66d507 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Sat, 15 Mar 2014 00:33:55 -0700
Subject: [PATCH] Avoid returning `assignDefaults` if no `object` is provided
 to `_.defaults`.

---
 lodash.js    | 11 +++++++----
 test/test.js |  4 ++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/lodash.js b/lodash.js
index 2d9e93281..28bbbf374 100644
--- a/lodash.js
+++ b/lodash.js
@@ -5440,11 +5440,11 @@
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
     function assign(object, source, guard) {
-      if (!object) {
+      var args = arguments;
+      if (!object || args.length < 2) {
         return object;
       }
-      var args = arguments,
-          argsIndex = 0,
+      var argsIndex = 0,
           argsLength = args.length,
           type = typeof guard;
 
@@ -5636,7 +5636,10 @@
      * _.defaults({ 'name': 'barney' }, { 'name': 'fred', 'employer': 'slate' });
      * // => { 'name': 'barney', 'employer': 'slate' }
      */
-    function defaults() {
+    function defaults(object) {
+      if (!object || arguments.length < 2) {
+        return object;
+      }
       var args = slice(arguments);
       args.push(assignDefaults);
       return assign.apply(null, args);
diff --git a/test/test.js b/test/test.js
index 005112327..bd4a4d625 100644
--- a/test/test.js
+++ b/test/test.js
@@ -2983,6 +2983,10 @@
   _.forEach(['assign', 'defaults', 'merge'], function(methodName) {
     var func = _[methodName];
 
+    test('`_.' + methodName + '` should return `undefined` when no destination object is provided', 1, function() {
+      strictEqual(func(), undefined);
+    });
+
     test('`_.' + methodName + '` should return the existing wrapper when chaining', 1, function() {
       if (!isNpm) {
         var wrapper = _({ 'a': 1 });