title: How to set value in nth element in a Haskell list?
body: <p>I know that <code>xs !! n</code> gives me nth element in a list, but I don't know how to edit nth element in that list. Can you tell me how can I edit nth element in a list or give a hint at least?</p>
  <p>For example how can I make the second element <code>'a'</code> an <code>'e'</code> in this: <code>['s','t','a','c','k']</code>?</p>