ngth</span>(b<span class="op">$</span>x<span class="op">$</span>data)</span>
<span id="cb18-7"><a href="overview.html#cb18-7"></a><span class="co">#&gt; [1] 8</span></span>
<span id="cb18-8"><a href="overview.html#cb18-8"></a></span>
<span id="cb18-9"><a href="overview.html#cb18-9"></a><span class="co"># Extract the `name` of each trace. plotly.js uses `name` to </span></span>
<span id="cb18-10"><a href="overview.html#cb18-10"></a><span class="co"># populate legend entries and tooltips</span></span>
<span i