AngularJS Example:

by gkucmierz

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<div ng-app>
    <div ng-controller="Ctrl">
        <input type="text" ng-model="a" />{{count()}}</div>
</div>

JavaScript

function Ctrl($scope) {

    $scope.count = (function () {
        var cnt = 0;
        return function () {
            return ++cnt;
        };
    })();
}