 20.44 27.29 10.6l37.1-37.1c59.28-59.26 59.28-155.7 0-214.96z"/>
      </svg></a> </h3>
<section aria-labelledby="toc_outside-of-class-definitions">
<p>You can also add observers to an object outside of a class definition
using <a href="https://api.emberjs.com/classes/Ember.Object.html#method_addObserver"><code>addObserver()</code></a>:</p>
<pre class="language-javascript line-numbers"><code class="javascript language-javascript">person<span class="token punctuation">.</span><span class="token function">add