title: How do I concatenate or merge arrays in Swift?
body: <p>If there are two arrays created in swift like this:</p>
  
  <pre><code>var a:[CGFloat] = [1, 2, 3]
  var b:[CGFloat] = [4, 5, 6]
  </code></pre>
  
  <p>How can they be merged to <code>[1, 2, 3, 4, 5, 6]</code>?</p>