Add an element to a multidimensional object?
<pre><code>var John = { Cats: 2, Dogs: 3, Turtles: 1 };

var Mary = { Dogs: 0, Parakeets: 3};
</code></pre>

<p>How do I append new dimensions after I've already created the objects?</p>

<blockquote>
  <p>...John now also has 1 Parakeet</p>
  
  <p>...Mary now also has 5 Koi</p>
</blockquote>