object whose value
is the sum of all individual parts. <a href="dart-core/Duration/Duration.html">[...]</a>
          <div class="constructor-modifier features">const</div>
        </dd>
      </dl>
    </section>

    <section class="summary offset-anchor" id="instance-properties">
      <h2>Properties</h2>

      <dl class="properties">
        <dt id="hashCode" class="property">
          <span class="name"><a href="dart-core/Duration/hashCode.html">hashCode</a></span>
          <span class="signature">&