title: how to prevent duplicate in array push in angularjs
body: <p>my code is like this :</p>
  
  <pre><code>var arr = [];
  arr.push(item1,item2);
  </code></pre>
  
  <p>so <code>arr</code> will contain like:
      ["name","thing1"]</p>
  
  <p>But i got problem when pushing element with same exact value, how do i filter same element value but still accepting update/changes. <a href="http://jsfiddle.net/AziziMusa/m9e1fkdg/2/" rel="noreferrer">JSFIDDLE</a></p>