Angular: Empty Fiddle
http://angularjs.org/
by boneskull
HTML
<script src="http://code.angularjs.org/1.2.0-rc.2/angular.js"></script>
<div ng-controller="MyCtrl">
{{derp}}
<div ng-repeat="foo in foos">
<button ng-click="derp = 'blah'">setDerp</button>
</div>
</div>
JavaScript
var myApp = angular.module('myApp',[]);
function MyCtrl($scope) {
$scope.foos = [1, 2, 3];
$scope.derp = 'herp';
}