Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<div ng-controller="MyCtrl">
  Inbound bound posts will contain {{things | join: ', ' }}
</div>

JavaScript

var myApp = angular.module('myApp', []);

//myApp.directive('myDirective', function() {});
//myApp.factory('myService', function() {});

function MyCtrl($scope) {
  $scope.things = ['phone', 'cat'];
}

myApp.filter('join', function() {
  return function join(array, separator, prop) {
    if (!Array.isArray(array)) {
      return array; // if not array return original - can also throw error
    }

    return (!!prop ? array.map(function(item) {
      return item[prop];
    }) : array).join(separator);
  };
});