RHS&#39; form</span></span>
<span id="cb6-13"><a href="#cb6-13" aria-hidden="true"></a><span class="co"># flights[, c(&quot;speed&quot;, &quot;delay&quot;) := list(distance/(air_time/60), arr_delay + dep_delay)]</span></span></code></pre></div>
</div>
<div id="note-that" class="section level4 bs-callout bs-callout-info">
<h4 class="bs-callout bs-callout-info">Note that</h4>
<ul>
<li><p>We did not have to assign the result back to <code>flights</code>.</p></li>
<li><p>The <code>flights</code> <em>data.table<