title: object doesn't support property or method 'findIndex' IE11 javascript issue
body: <p>I have an AngularJS application that is giving me some issues in Internet Explorer 11 - In my administration area I am getting console log errors that seem to correlate with some problems I have noticed in the page with filtering data when using Internet Explorer (version 11 specifically) however fine in Chrome/Firefox etc.</p>
  
  <pre><code>Object doesn't support property or method 'findIndex' 
  at Anonymous function (http://myapp.local/js/controllers/admin/UsersController.js:363:9)
  </code></pre>
  
  <p>When I navigate to this line in the code this is the section in question :-</p>
  
  <pre><code>[363]   var indexInOriginalSet = $scope.originalSet.findIndex(function(u) {
  [364]        return u.id == userId;
  [365]   });
  </code></pre>
  
  <p>What is the best solution to fix this IE problem with the findIndex?</p>