AngularJS, how to check if array contains duplicate values?
<p>How do I check <strong>particularly using AngularJS</strong> if an array has duplicate values?</p>

<p>If more than 1 element of the same exist, then return true. 
Otherwise, return false.</p>

<pre><code>$scope.intArray = [5, 11, 17, 53] // return false because no duplicates exist
$scope.intArray = [5, 11, 17, 5]  // return true because duplicaets exist
</code></pre>