 in the object.
While we normally refer to a particular method of an object using <code>object.method</code>,
we can also look them up by asking for <code>object[name]</code>
in the same way that we would look up any other property of any other object.
Our completed class looks like this:</p>
<div class="code-sample lang-js" title="walker-class.js">
<div class="highlight"><pre><span></span><code><span class="kd">class</span><span class="w"> </span><span class="nx">Walker</span><span class="w"> </span><span 