<span class='fu'><a href='https://rdrr.io/r/base/environment.html'>environment</a></span>(), <span class='fu'><a href='https://rdrr.io/r/base/data.frame.html'>data.frame</a></span>(<span class='kw'>a</span><span class='kw'>=</span><span class='fl'>1</span>)))
 <span class='fu'>pop</span>(<span class='no'>s</span>)</div><div class='output co'>#&gt;   a
#&gt; 1 1</div><div class='input'>
 <span class='co'># pops from a fibonacci heap</span>
 <span class='no'>b_heap</span> <span class='kw'>&lt;-</span> <span c