     
</dd>
        <dt id="lookup" class="callable">
          <span class="name"><a href="dart-core/Set/lookup.html">lookup</a></span><span class="signature">(<wbr><span class="parameter" id="lookup-param-object"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">object</span></span>)
            <span class="returntype parameter">&#8594; E</span>
          </span>
        </dt>
        <dd>
          If an object equal to <code>object</code>