n>
                  </dt>
        <dd>
          Returns a string representation of this object.
                  <div class="features">override</div>
</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