ass="parameter" id="tryParse-param-source"><span class="type-annotation"><a href="../../dart-core/String-class.html">String</a></span> <span class="parameter-name">source</span></span></li>
</ol>)
      <div class="features">override</div>
    </section>
    <section class="desc markdown">
      <p>Parse <code>source</code> as an double literal and return its value.</p>
<p>Like <a href="../../dart-core/double/parse.html">parse</a> except that this function returns <code>null</code> for invalid inputs
instea