From 5ca27ffed139bb14aad12040c05f9b88a7ab8597 Mon Sep 17 00:00:00 2001
From: Bob Remeika <bremeika@yammer-inc.com>
Date: Tue, 20 Dec 2011 01:51:51 -0800
Subject: [PATCH] Fixes #409 - Unexpected arguments passed to wrapper function
 in _.wrap when the first argument of calling the wrapper function is an array

---
 test/functions.js | 5 +++++
 underscore.js     | 3 +--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/test/functions.js b/test/functions.js
index fdaddcc96..78721af16 100644
--- a/test/functions.js
+++ b/test/functions.js
@@ -163,6 +163,11 @@ $(document).ready(function() {
     var obj   = {name : "Moe"};
     obj.hi    = _.wrap(inner, function(fn){ return fn() + this.name; });
     equals(obj.hi(), "Hello Moe");
+
+    var noop    = function(){};
+    var wrapped = _.wrap(noop, function(fn){ return Array.prototype.slice.call(arguments, 0); });
+    var ret     = wrapped(['whats', 'your'], 'vector', 'victor');
+    same(ret, [noop, ['whats', 'your'], 'vector', 'victor']);
   });
 
   test("functions: compose", function() {
diff --git a/underscore.js b/underscore.js
index 9cf1de923..638ae6a6c 100644
--- a/underscore.js
+++ b/underscore.js
@@ -25,7 +25,6 @@
 
   // Create quick reference variables for speed access to core prototypes.
   var slice            = ArrayProto.slice,
-      concat           = ArrayProto.concat,
       unshift          = ArrayProto.unshift,
       toString         = ObjProto.toString,
       hasOwnProperty   = ObjProto.hasOwnProperty;
@@ -584,7 +583,7 @@
   // conditionally execute the original function.
   _.wrap = function(func, wrapper) {
     return function() {
-      var args = concat.apply([func], arguments);
+      var args = [func].concat(slice.call(arguments, 0));
       return wrapper.apply(this, args);
     };
   };