title: Swift init Array with capacity
body: <p>How do I initialize an Array in swift with a specific capacity?</p>
  
  <p>I've tried:</p>
  
  <pre><code>var grid = Array &lt;Square&gt; ()
  grid.reserveCapacity(16)
  </code></pre>
  
  <p>but get the error</p>
  
  <pre><code>expected declaration 
  </code></pre>