s="parameter-name">combine</span>(<span class="parameter" id="param-previousValue"><span class="type-annotation">T</span> <span class="parameter-name">previousValue</span>, </span><wbr><span class="parameter" id="param-element"><span class="type-annotation">E</span> <span class="parameter-name">element</span></span><wbr>)</span><wbr>)
            <span class="returntype parameter">&#8594; T</span>
          </span>
                  </dt>
        <dd class="inherited">
          Reduces a collection to a si