hPhotosOfUsers</code>, <code>applyInstagramFilters</code>, or
<code>uploadTrendyPhotoAlbum</code> returns a promise that rejects,
<code>handleErrors</code> will be called with
the reason for the failure. In this manner, promises approximate an
asynchronous form of try-catch statements that prevent the rightward
flow of nested callback after nested callback and facilitate a saner
approach to managing complex asynchronous logic in your applications.</p>
</section>
<h3 id="toc_the-router-pauses-for-promises">T