From 2adac8bdaed7e61fc5bf11e2ce41b989793cdc53 Mon Sep 17 00:00:00 2001
From: jdalton <john.david.dalton@gmail.com>
Date: Wed, 1 Apr 2015 01:26:27 -0700
Subject: [PATCH] Use `_.restParam` in `createAssigner`.

---
 lodash.src.js | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/lodash.src.js b/lodash.src.js
index 8ab4bb4ec..84f50b2e4 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -3207,38 +3207,32 @@
      * @returns {Function} Returns the new assigner function.
      */
     function createAssigner(assigner) {
-      return function() {
-        var args = arguments,
-            length = args.length,
-            object = args[0];
+      return restParam(function(object, sources) {
+        var index = -1,
+            length = object == null ? 0 : sources.length,
+            customizer = sources[length - 2],
+            thisArg = sources[length - 1],
+            guard = sources[2];
 
-        if (length < 2 || object == null) {
-          return object;
-        }
-        var customizer = args[length - 2],
-            thisArg = args[length - 1],
-            guard = args[3];
-
-        if (length > 3 && typeof customizer == 'function') {
+        if (length > 2 && typeof customizer == 'function') {
           customizer = bindCallback(customizer, thisArg, 5);
           length -= 2;
-        } else {
-          customizer = (length > 2 && typeof thisArg == 'function') ? thisArg : null;
+        } else if (length > 1) {
+          customizer = typeof thisArg == 'function' ? thisArg : null;
           length -= (customizer ? 1 : 0);
         }
-        if (guard && isIterateeCall(args[1], args[2], guard)) {
-          customizer = length == 3 ? null : customizer;
-          length = 2;
+        if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+          customizer = length < 3 ? null : customizer;
+          length = 1;
         }
-        var index = 0;
         while (++index < length) {
-          var source = args[index];
+          var source = sources[index];
           if (source) {
             assigner(object, source, customizer);
           }
         }
         return object;
-      };
+      });
     }
 
     /**