ement"><span class="type-annotation"><a href="../dart-core/Object-class.html">Object</a></span> <span class="parameter-name">element</span>, </span><wbr><span class="parameter" id="indexOf-param-start">[<span class="type-annotation"><a href="../dart-core/int-class.html">int</a></span> <span class="parameter-name">start</span> = <span class="default-value">0</span>]</span><wbr>)
            <span class="returntype parameter">&#8594; <a href="../dart-core/int-class.html">int</a></span>
          </span>
     