title: Select() from LINQ in swift 3.0?
body: <p>Is it exist some alternative of LINQ Select() method in the Swift language?</p>
  
  <p>As example, in c# I can do the following:</p>
  
  <pre><code>var ranks = cards.Select(a=&gt; a.Rank).ToArray();
  </code></pre>
  
  <p>but how I can do the same thing using Swift language?</p>