="type-annotation"><a href="dart-async/FutureOr-class.html">FutureOr</a></span> <span class="parameter-name">action</span>(<span class="parameter" id="action-param-element"><span class="type-annotation">T</span> <span class="parameter-name">element</span></span>)</span>)
            <span class="returntype parameter">&#8594; <a href="dart-async/Future-class.html">Future</a></span>
          </span>
                  </dt>
        <dd>
          Performs an action for each element of the iterable, in turn. <