Throws a <a href="../../dart-core/StateError-class.html">StateError</a> if <code>this</code> is empty or has more than one element.</p>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code class="language-dart">E get single {
  if (_head == _tail) throw IterableElementError.noElement();
  if (length &gt; 1) throw IterableElementError.tooMany();
  return _table[_head];
}</code></pre>
    