https://api.emberjs.com/classes/RSVP.html#method_hash">RSVP.hash</a>.
The <code>RSVP.hash</code> takes
parameters that return promises, and when all parameter promises resolve, then
the <code>RSVP.hash</code> promise resolves. For example:</p>
<div class="filename javascript"><div class="ribbon"></div><span>app/routes/songs.js</span><pre class="language-javascript line-numbers"><code class="javascript language-javascript"><span class="token keyword">import</span> Ember <span class="token keyword">from</span