n class="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">test</span>(<span class="parameter" id="test-param-element"><span class="type-annotation">T</span> <span class="parameter-name">element</span></span>), {</span> <span class="parameter" id="singleWhere-param-orElse"><span class="type-annotation"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<a href="dart-core/int-class.html">int</a>&gt;</span></span> <span class="parameter-name