co"><span class="r-pr">#&gt;</span> ["a", 1]</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-in"><span><span class="fu"><a href="unpack.html">unpack</a></span><span class="op">(</span><span class="va">s</span><span class="op">)</span>   <span class="co"># flatten recursively similar to unlist</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>       b              c1  c2 </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> "1"  NA "1" "2