pe-parameter">F extends Function</span>&gt;(<wbr><span class="parameter" id="lookupFunction-param-symbolName"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">symbolName</span></span>)
      
    </section>
    <section class="desc markdown">
      <p>Helper that combines lookup and cast to a Dart function.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class