title: Reference count in ARC
body: <p>I have little bit confusion in <code>ARC</code> reference count can you please tell me what will be reference count of bellow code.</p>
  
  <pre><code>var vc1 = UIViewController()
  var vc2 = vc1
  var vc3 = vc2
  weak var vc4 = vc3
  </code></pre>
  
  <p><strong>Question is what will be the:</strong></p>
  
  <ul>
  <li>reference count of vc1 ?</li>
  <li>reference count of vc2 ?</li>
  <li>reference count of vc3 ?</li>
  <li>reference count of vc4 ?</li>
  </ul>