title: iOS swift remove elements of an array from another array
body: <p>I have two arrays</p>
  
  <pre><code>var array1 = new Array ["a", "b", "c", "d", "e"]
  var array2 = new Array ["a", "c", "d"]
  </code></pre>
  
  <p>I want to remove elements of array2 from array1</p>
  
  <pre><code>Result ["b", "e"]
  </code></pre>