title: AngularJS select first letter of a set
body: <p>I have a list of things that are selectable and a filter area where a user can click the first letter: A B C D, etc</p>
  
  <p>If a user clicks A, I want the URL to be <code>/products/a</code> and then I want to filter all products starting with the letter <code>a</code>. I'm not entirely sure how to do this.</p>
  
  <p>Thoughts?</p>