wise
return <code>nil</code>.</p>

<p><strong>Complexity:</strong> O(<code>self.count</code>)</p>

    <h4>Declaration</h4>    
    <code class="language-swift">mutating func popFirst() -&gt; Base._Element?</code>
    
        <h4>Declared In</h4>
        <a href="../../protocol/CollectionType/"><code>CollectionType</code></a>    
</div></div>
</div>
<div class="declaration inherited" id="func-poplast">
<a class="toggle-link" data-toggle="collapse" href="#comment-func-poplast">mutating func popLast()</a>
  