d">Ember.computed</a> macros
utilize the <code>[]</code> key to implement common use-cases. For instance, to
create a computed property that mapped properties from an array, you could use
<a href="https://api.emberjs.com/ember/3.7/classes/@ember%2Fobject%2Fcomputed/methods/map?anchor=map">Ember.computed.map</a>
or build the computed property yourself:</p>
<pre class="language-javascript line-numbers"><code class="javascript language-javascript"><span class="token keyword">import</span> EmberObject<span clas