That&#x27;s just &quot;Promises&quot; right?<p><a href="http:&#x2F;&#x2F;www.html5rocks.com&#x2F;en&#x2F;tutorials&#x2F;es6&#x2F;promises&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.html5rocks.com&#x2F;en&#x2F;tutorials&#x2F;es6&#x2F;promises&#x2F;</a><p><a href="https:&#x2F;&#x2F;developer.mozilla.org&#x2F;en-US&#x2F;docs&#x2F;Web&#x2F;JavaScript&#x2F;Reference&#x2F;Global_Objects&#x2F;Promise" rel="nofollow">https:&#x2F;&#x2F;developer.mozilla.org&#x2F;en-US&#x2F;docs&#x2F;Web&#x2F;JavaScript&#x2F;Refe...</a><p>Also, don&#x27;t follow implementation. Follow the spec, and implement against it, not against an existing implementation.<p><a href="https:&#x2F;&#x2F;promisesaplus.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;promisesaplus.com&#x2F;</a>