it was useful, not just a
theoretical curiosity.</p></li>
<li><p>We can use data frames to allow summary functions to return
multiple columns.</p></li>
<li><p>We can use the absence of an outer name as a convention that you
want to unpack a data frame column into individual columns.</p></li>
</ul>
</div>
<div id="how-do-you-convert-existing-code" class="section level3">
<h3>How do you convert existing code?</h3>
<p>Fortunately, it’s generally straightforward to translate your
existing code to use <code>ac