alters some internal state of the object (by updating
the <code>foo</code> property).</p>
<pre class="language-javascript line-numbers"><code class="javascript language-javascript">App<span class="token punctuation">.</span>SomeThing <span class="token operator">=</span> Ember<span class="token punctuation">.</span>Object<span class="token punctuation">.</span><span class="token function">extend</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token liter