title: Creating user initials as a computed observable
body: <p>So i am looking into created a computed observable that will take the first letter of the <code>first name</code> and first letter of the <code>last name</code> and create an <code>initials</code> observable.</p>
  
  <pre><code>self.firstName = ko.observable(data.firstName);
  self.lastName = ko.observable(data.lastName);
  self.initials = ko.pureComputed(function(){return...});
  </code></pre>
  
  <p>what is the proper way to get the first letter for each of the name variables?</p>