itarists</span></span>
<span><span class="co">#&gt; [1] "John"   "Paul"   "George" "Keith"  "Ronnie" "Bill"  </span></span>
<span><span class="co">#&gt; </span></span>
<span><span class="co">#&gt; $singers</span></span>
<span><span class="co">#&gt; [1] "Mick"</span></span></code></pre></div>
<p>In a similar manner, an aggregation map can be converted to a data
frame to assist with join operations with data frames.</p>
<div class="sourceCode" id="cb23"><pre class="downlit sourceCode r">
<code class="sourceCo