<a href="dart-core/Map/clear.html">[...]</a>
          <div class="features">inherited</div>
</dd>
        <dt id="containsKey" class="callable inherited">
          <span class="name"><a href="dart-core/Map/containsKey.html">containsKey</a></span><span class="signature">(<wbr><span class="parameter" id="containsKey-param-key"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">key</span></span>)
            <span class="returntype parameter">&#