title: Convert range to comma delimited string
body: <p>If I had a column like this:</p>
  
  <pre><code>Col1
  abc
  def
  ghi
  jkl
  </code></pre>
  
  <p>How can I convert it to a string like this?:</p>
  
  <pre><code>"abc,def,ghi,jkl"
  </code></pre>