"returntype"><a href="polymer_app_layout/Plugin-class.html">Plugin</a></span>
                  </span>
              </dt>
              <dd>
                  
              </dd>
              <dt id="reduce" class="callable">
                  <span class="name ">reduce</span><span class="signature">(<wbr><span class="parameter" id="reduce-param-combine"><span class="type-annotation">E</span> <span class="parameter-name">combine</span>(<span class="parameter" id="combine-param-previousValue"><span class