ne-signature">
      <span class="returntype"><a href="dart-core/bool-class.html">bool</a></span>
            <span class="name ">containsKey</span>
(<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>)
      <div class="features">override</div>
    </section>
    <section class="desc markdown">
      <p>Returns true if this map contains the given <code>key</code>.</p>
<p>