code>this</code> is empty.
Otherwise may iterate through the elements and returns the last one
seen.
Some iterables may have more efficient ways to find the last element
(for example a list can directly access the last element,
without iterating through the previous ones).</p>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code class="language-dart">E get last {
  if (_head == _tail) th