eyword">fun </span><a href="group-by.html"><span class="token function">groupBy</span></a><span class="token punctuation">(</span><span class="parameters "><span class="parameter "><span class="token keyword">vararg </span>expressions<span class="token operator">: </span><a href="../-expression/index.html">Expression</a></span></span><span class="token punctuation">)</span><span class="token operator">: </span><a href="../-group-by/index.html">GroupBy</a><span class="clearfix"><span class="floating-right">(