span><span class="va">d</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] 3</span>
<span class="r-in"><span><span class="fu"><a href="peek.html">peekleft</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] 1</span>
<span class="r-in"><span><span class="fu"><a href="peek.html">peek</a></span><span class="op">(</span><span class="fu">deque</span><spa