title: AngularJs Remove duplicate elements in ng-repeat
body: <p>I have one dictionary which is stored in <code>field_detail</code></p>
  
  <pre><code>&lt;li ng-repeat = "field in field_detail"&gt;{{field.displayName}}&lt;/li&gt;
  </code></pre>
  
  <p>Now I dont want to include duplicate <code>displayName</code> of <code>field_detail</code> , what <code>filter</code> should I use?</p>