"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>Returns true if any of the keys in the map are equal to <code>key</code>
according to the equality used by the map.</p>
  