fixed condext during construction of bound functions; now using native

Function::bind when it is available. related: #1363
jashkenas · May 27, 2011 · 8d6e33c · satyr · May 28, 2011 · michaelficarra
1 parent 085874d
commit 8d6e33c
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Showing 3 changed files with 29 additions and 7 deletions.
diff --git a/lib/nodes.js b/lib/nodes.js
diff --git a/src/nodes.coffee b/src/nodes.coffee
@@ -1769,7 +1769,17 @@ UTILITIES =
 
   # Create a function bound to the current value of "this".
   bind: '''
-    function(fn, me){ return function(){ return fn.apply(me, arguments); }; }
+    (Function.prototype.bind ? Function.prototype.call.bind(Function.prototype.bind) : function(fn, me){
+		return function bound(){
+			if (!(this instanceof bound))
+				return fn.apply(me, arguments);
+			var ctor = function(){};
+			ctor.prototype = fn.prototype;
+			var obj = new ctor();
+			fn.apply(obj, arguments);
+			return obj;
+		};
+	})
   '''
 
   # Discover if an item is in an array.

diff --git a/test/classes.coffee b/test/classes.coffee
@@ -431,10 +431,12 @@ test "`new` shouldn't add extra parens", ->
 
 
 test "`new` works against bare function", ->
-
-  eq Date, new ->
-    eq this, new => this
-    Date
+  nonceA = {}
+  nonceB = null
+  eq nonceA, new ->
+    eq (new => nonceB = this), nonceB
+    notEqual this, new => this
+    nonceA
 
 
 test "#1182: a subclass should be able to set its constructor to an external function", ->