<span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] 4</span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/names.html" class="external-link">names</a></span><span class="op">(</span><span class="va">d</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] ""  ""  "s" "v"</span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">a