/code> if <code>.p(.x)</code> is not TRUE :</p>
<div class="sourceCode" id="cb25"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb25-1" title="1"><span class="kw"><a href="reference/ifthenelse.html">if_not</a></span>(<span class="dt">.x =</span> <span class="dv">1</span>, <span class="dt">.p =</span> is.character, <span class="op">~</span><span class="st"> ".x is not a character"</span>)</a>
<a class="sourceLine" id="cb25-2" title="2"><span class="co">#&gt; [1] ".x is not a 