y to set a computed property, it will be invoked with the key (property name), and the value you want to set it to.
You must return the new intended value of the computed property from the setter function.</p>
<pre class="language-javascript line-numbers"><code class="javascript language-javascript">Person <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">(