title: Sorting a String array and ignoring case
body: <p>The code below works for sorting an array of strings if they are all lowercase or all uppercase but I want to ignore case when I sort. How could I do this? The following is an array of a custom class. </p>
  
  <p><code>resultListArray.sort({ $0.fileName.compare($1.fileName) == NSComparisonResult.OrderedAscending })</code></p>