__bind helper: caching ctor

jashkenas · May 27, 2011 · 9cbf2a8 · 9cbf2a8
1 parent 6a40807
commit 9cbf2a8
Show file tree

Hide file tree

Showing 2 changed files with 14 additions and 14 deletions.
diff --git a/lib/nodes.js b/lib/nodes.js
diff --git a/src/nodes.coffee b/src/nodes.coffee
@@ -1770,12 +1770,12 @@ UTILITIES =
   # Create a function bound to the current value of "this".
   bind: '''
     (Function.prototype.bind ? Function.prototype.call.bind(Function.prototype.bind) : function(fn, me){
+      var ctor = function(){};
+      ctor.prototype = fn.prototype;
       return function bound(){
         if (!(this instanceof bound))
           return fn.apply(me, arguments);
-        var ctor = function(){};
-        ctor.prototype = fn.prototype;
-        var obj = new ctor();
+        var obj = new ctor;
         fn.apply(obj, arguments);
         return obj;
       };