berjs.com/ember/3.4/classes/MutableArray/methods/mapBy?anchor=mapBy"><code>mapBy()</code></a>
method that will extract the named property from each of those objects
in turn and return a new array:</p>
<pre class="language-javascript line-numbers"><code class="javascript language-javascript"><span class="token keyword">import</span> EmberObject <span class="token keyword">from</span> <span class="token string">'@ember/object'</span><span class="token punctuation">;</span>

<span class="token keyword">let</sp