title: How do I do indexOfObject or a proper containsObject
body: <p>With an array: How do I do <code>indexOfObject</code> or a proper <code>containsObject</code>?</p>
  
  <p>I mean I know I could just bridge the Array to <code>NSArray</code> and do it there ^^<br/>
  But there must be a 'native' way of doing this</p>
  
  <p>P.S. for the <code>containsObject</code> I guess I could filter the array too but for <em>indexOf</em>?</p>