value for the provided <code>key</code>. <a href="dart-collection/MapMixin/update.html">[...]</a>
                  <div class="features">override</div>
</dd>
        <dt id="updateAll" class="callable">
          <span class="name"><a href="dart-collection/MapMixin/updateAll.html">updateAll</a></span><span class="signature">(<wbr><span class="parameter" id="updateAll-param-update"><span class="type-annotation">V</span> <span class="parameter-name">update</span>(<span class="parameter" id="update-param-key"