Added in jQuery.proxy(obj, name), like the method described in Secret…

…s of the JavaScript Ninja and in Dojo's Hitch, and added in some unit tests.

src/core.js

@@ -618,17 +618,28 @@ jQuery.extend({
 	guid: 1,
 
 	proxy: function( fn, proxy, thisObject ) {
-		if ( arguments.length === 2 && proxy && !jQuery.isFunction( proxy ) ) {
-			thisObject = proxy;
-			proxy = undefined;
+		if ( arguments.length === 2 ) {
+			if ( typeof proxy === "string" ) {
+				thisObject = fn;
+				fn = thisObject[ proxy ];
+				proxy = undefined;
+
+			} else if ( proxy && !jQuery.isFunction( proxy ) ) {
+				thisObject = proxy;
+				proxy = undefined;
+			}
 		}
 
-		proxy = proxy || function() {
-			return fn.apply( thisObject || this, arguments );
-		};
+		if ( !proxy && fn ) {
+			proxy = function() {
+				return fn.apply( thisObject || this, arguments );
+			};
+		}
 
 		// Set the guid of unique handler to the same of original handler, so it can be removed
-		proxy.guid = fn.guid = fn.guid || proxy.guid || jQuery.guid++;
+		if ( fn ) {
+			proxy.guid = fn.guid = fn.guid || proxy.guid || jQuery.guid++;
+		}
 
 		// So proxy can be declared as an argument
 		return proxy;

test/unit/core.js

@@ -839,3 +839,22 @@ test("jQuery.isEmptyObject", function(){
 	// What about this ?
 	// equals(true, jQuery.isEmptyObject(null), "isEmptyObject on null" );
 });
+
+test("jQuery.proxy", function(){
+	expect(4);
+
+	var test = function(){ equals( this, thisObject, "Make sure that scope is set properly." ); };
+	var thisObject = { foo: "bar", method: test };
+
+	// Make sure normal works
+	test.call( thisObject );
+
+	// Basic scoping
+	jQuery.proxy( test, thisObject )();
+
+	// Make sure it doesn't freak out
+	equals( jQuery.proxy( null, thisObject ), undefined, "Make sure no function was returned." );
+
+	// Use the string shortcut
+	jQuery.proxy( thisObject, "method" )();
+});