ote that if no problems are found, <code>NULL</code> is stored under <code>problemValues</code>.</li>
<li>Lastly, we use <code>unlist()</code> to obtain a character vector with the result. Note that this function automatically drops <code>NULL</code> entries.</li>
</ol>
<pre class="r"><code>missCheck &lt;- check(toyData, checks = setChecks(all = &quot;identifyMissing&quot;))
missCheckValList &lt;- sapply(missCheck, function(x) x$identifyMissing$problemValues) 
missCheckVals &lt;- unlist(missCheckValList)

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