title: How to further filter variable within a list that has multiple data.frame
body: <p>I have a list of data.frame and want to filter variables base one a variable list.</p>
  <p>The codes I used is</p>
  <pre><code>datalist1&lt;-map(datalist, function(.x) .x &lt;-.x %&gt;% select(any_of(Valst$Var.name)))
  </code></pre>
  <p>If my datalist has 5 data.frame: <code>data1, data2, data3, data4, data5</code>.</p>
  <p>Q1: If I only want to use Valst$Var.name to filter out data2, data3, data4, what should I do?
  Q2: what if I want to keep extra variable <code>var6</code> in <code>data3</code>, what should I do?</p>
  <p>Any guidance on this will be highly appreciated.</p>