Error</a></li>
      <li><a href="dart-core/TypeError-class.html">TypeError</a></li>
      <li><a href="dart-core/UnimplementedError-class.html">UnimplementedError</a></li>
      <li><a href="dart-core/UnsupportedError-class.html">UnsupportedError</a></li>
    </ol>
  </div>

  <div class="col-xs-12 col-sm-9 col-md-8 main-content">
    <h1>Function class</h1>

    <section class="desc markdown">
      <p>The base class for all function types.</p>
<p>A function value, or an instance of a class with a "call" 