title: How to create a computed observable array in Knockout
body: <p>I would like to know how to create a computed observable array.  </p>
  
  <p>In my view model, I have 2 observable arrays, and I would like to have a computed observable array that is simply both arrays combined.</p>
  
  <pre><code>function ViewModel() {
      var self = this;
      self.listA= ko.observableArray([]);
      self.listB = ko.observableArray([]);
      self.masterList= //combine both list A and B
  </code></pre>