item-toggle-none"></span><a href="#Set.prototype.reduce" title="Set.prototype.reduce( callbackfn [ , initialValue ] )"><span class="secnum">2.6</span> Set.prototype.reduce( <var>callbackfn</var> [ , <var>initialValue</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#Set.prototype.join" title="Set.prototype.join( [ separator ] )"><span class="secnum">2.7</span> Set.prototype.join( [ <var>separator</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#Set.prototype.add-elem