   <span class="returntype parameter">&#8594; <a href="../dart-core/Set-class.html">Set</a><span class="signature">&lt;<wbr><span class="type-parameter">E</span>&gt;</span></span>
          </span>
                  </dt>
        <dd class="inherited">
          Returns a new set which contains all the elements of this set and <code>other</code>. <a href="../dart-core/Set/union.html">[...]</a>
                  <div class="features">inherited</div>
</dd>
        <dt id="where" class="callable inherited">
  