lass="fu">mutate_when</span><span class="op">(</span><span class="va">.data</span>, <span class="va">when</span>, <span class="va">...</span>, <span class="va">by</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">mutate_vars</span><span class="op">(</span><span class="va">.data</span>, .cols <span class="op">=</span> <span class="cn">NULL</span>, <span class="va">.func</span>, <span class="va">...</span>, <span class="va">by</span><span class="op">)</span></span></code></pre></di