New (crazy) filter

examples/try/my_crazy_filter.html
<!DOCTYPE html>
<html>
<head>
    <title>Crazy Case</title>
    <meta charset="utf-8">
    <meta name="viewport"
      content="width=device-width, initial-scale=1.0, user-scalable=yes">

    <script src="../angular/angular.min.js"></script>
<script>
angular.module("DemoApp", ['FilterApp']).
   controller('DemoController', function($scope) {
   });
 angular.module('FilterApp', [])
    .filter('crazycase', function(){
        return function(input) {
            if (input === undefined) {
                return '';
            }
            var crazy = '';
            for(i=0; i < input.length; i++) {
                if (i % 2) {
                    crazy += input[i].toUpperCase();
                } else {
                    crazy += input[i].toLowerCase();
                }
            }
            return crazy;
        }
    })
</script>

</head>
<body>
<h1>Crazy Case</h1>
<div ng-app="DemoApp" ng-controller="DemoController">
    <input ng-model="text" type="text" placeholder="Type in some text">
    <div>{{ text }}</div>
    <div>{{ text | crazycase }}</div>
</div>

</body>
</html>