React: Use classSet helper instead of recreating

labs/architecture-examples/react/index.html

@@ -12,7 +12,7 @@
 		<div id="benchmark"></div>
 
 		<script src="bower_components/todomvc-common/base.js"></script>
-		<script src="bower_components/react/react.js"></script>
+		<script src="bower_components/react/react-with-addons.js"></script>
 		<script src="bower_components/react/JSXTransformer.js"></script>
 		<script src="bower_components/director/build/director.min.js"></script>
 

labs/architecture-examples/react/js/todoItem.jsx

@@ -71,7 +71,7 @@
 
 		render: function () {
 			return (
-				<li className={Utils.stringifyObjKeys({
+				<li className={React.addons.classSet({
 					completed: this.props.todo.completed,
 					editing: this.props.editing
 				})}>

labs/architecture-examples/react/js/utils.jsx

@@ -43,19 +43,6 @@
 				}
 			}
 			return newObj;
-		},
-
-		stringifyObjKeys: function (obj) {
-			var s = '';
-			var key;
-
-			for (key in obj) {
-				if (obj.hasOwnProperty(key) && obj[key]) {
-					s += key + ' ';
-				}
-			}
-
-			return s.trim();
 		}
 	};