title: What is equivalent of "dispatch_apply" in Swift 3?
body: <p>I have been searching for an equivalent of dispatch_apply in swift3. Help me please</p>
  
  <p>convert </p>
  
  <pre><code>    let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
      dispatch_apply(2, queue) { (index)  in
      }
  </code></pre>