AngularJS Simple Example

HTML

<!DOCTYPE html>
<html ng-app="youvcode">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.0.x" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js" data-semver="1.0.7"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <div ng-controller="ChildCtrl">
      <div>myobj is {{undefined1}}</div>
      <div>myobj is {{undefined2}}</div>
      <div>myobj is {{undefined3}}</div>
      
    </div>
  </body>

</html>

JavaScript

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

app.controller('MainCtrl', function($scope, Utils) {
    $scope.utils = Utils;
});

app.controller('ChildCtrl', function($scope, Utils) {
   $scope.undefined1 = Utils.isUndefinedOrNull("youvcode.com");
   $scope.undefined2 = $scope.utils.isUndefinedOrNull(45);
   $scope.undefined3 = $scope.utils.isUndefinedOrNull();

});

app.factory('Utils', function() {
  var service = {
     isUndefinedOrNull: function(obj) {
         return angular.isDefined(obj) || obj===null;
     }
    
  }
  
  return service;
});