title: How can I case_when to add a new column with the nrow/length of each list from a tibble column of lists in R?
body: <p>Here is an example illustrating the desired Out, which currently gives all T</p>
  <pre class="lang-r prettyprint-override"><code>Eg &lt;- tibble(&quot;A&quot;=  c(&quot;A&quot;,&quot;B&quot;, &quot;C&quot;),
              &quot;Number&quot; = 1:3,
               &quot;Lists&quot; = c(tibble(A=c(1,5)),tibble(A=1),tibble(B=2)))
  Out &lt;- Eg%&gt;%
    mutate(New= case_when(length(Lists)==2~F,
                          T~T))
  
  #My desired Out would be
  print(Out$New)
  F T T
  </code></pre>