then do that”:</p>
<div class="sourceCode" id="cb24"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb24-1" title="1"><span class="kw"><a href="reference/ifthenelse.html">if_then</a></span>(<span class="dv">1</span>, is.numeric, <span class="op">~</span><span class="st"> "nop!"</span>)</a>
<a class="sourceLine" id="cb24-2" title="2"><span class="co">#&gt; [1] "nop!"</span></a></code></pre></div>
<p><code><a href="reference/ifthenelse.html">if_not()</a></code> runs <code>.f<