title: How to addObject as NSMutableArray in NSMutableArray in swift
body: <p>I want to <code>addObject</code> of <code>NSMutableArray</code> into <code>NSMutableArray</code> so how can I achieve this in swift.
  and also retrieve it so please help me because right now I'm learning swift.</p>
  
  <p>Indirectly say that I want 2D array means <code>NSMutableArray</code> of <code>NSMutableArray</code>.</p>
  
  <pre><code>//The below 2 lines iterative!
  var dict:NSMutableDictionary? = NSMutableDictionary();
   linePointsArray!.addObject(dict!);
  
  // and below 2 line is execute after complete the above iteration
   arrLine!.addObject(linePointsArray!);
   linePointArray!.removeAllObject();
  
  //after that the above whole process is done iterative.
  </code></pre>