AngularJS Extend

HTML

<div ng-app="">
  <div ng-controller="MyCtrl">
      {{hi}}
  </div>
</div>

CSS

</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ --> 
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js"></script>
<style>

.ng-invalid { 
    border: 1px solid red; 
}

JavaScript

var ng = angular;

function MyCtrl($scope) {
  
  $scope.hi = 'Hello World';
    var obj1 = ['1','2','3','4'];
    var obj2 = ['5','6','7','8','9'];
    console.log(ng.extend(obj1, obj2));
}