esentation of this object.
          
</dd>
        <dt id="update" class="callable">
          <span class="name"><a href="dart-collection/MapMixin/update.html">update</a></span><span class="signature">(<wbr><span class="parameter" id="update-param-key"><span class="type-annotation">K</span> <span class="parameter-name">key</span>, </span> <span class="parameter" id="update-param-update"><span class="type-annotation">V</span> <span class="parameter-name">update</span>(<span class="parameter" id="update-par