Added in jQuery.proxy(obj, name), like the method described in Secrets of the...

Added in jQuery.proxy(obj, name), like the method described in Secrets 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" )();
+});