   </dt>
        <dd>
          Removes all elements in the queue. The size of the queue becomes zero.
          
</dd>
        <dt id="firstEntry" class="callable">
          <span class="name"><a href="dart-collection/DoubleLinkedQueue/firstEntry.html">firstEntry</a></span><span class="signature">(<wbr>)
            <span class="returntype parameter">&#8594; <a href="dart-collection/DoubleLinkedQueueEntry-class.html">DoubleLinkedQueueEntry</a><span class="signature">&lt;E&gt;</span></span>
          </spa