an class="op"><a href="pipe.html">%&gt;%</a></span> <span class="fu"><a href="join.html">join</a></span><span class="op">(</span><span class="va">island2</span><span class="op">)</span> <span class="op"><a href="pipe.html">%&gt;%</a></span> <span class="fu"><a href="join.html">join</a></span><span class="op">(</span><span class="va">island3</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">custom_map</span> <span class="op">&lt;-<