ey"><span class="type-annotation">String</span> <span class="parameter-name">key</span></span>
            </div>
            )    </section>

    <section class="desc markdown">
    
          <p>Returns true if this map contains the given <code class="prettyprint lang-dart">key</code>.</p>
<p>Returns true if any of the keys in the map ar equal to <code class="prettyprint lang-dart">key</code>
according to the equality used by the map.</p>
    
    </section>

    <section class="summary source-code" id="s