title: Double map in haskell?
body: <p>I am still a haskell beginner.  Can I do a double map in haskell?  </p>
  
  <p>For example, if I have a <code>[[Char]]</code> and I want to convert each <code>Char</code> in each <code>[Char]</code> to lower case, is there an easy way to do this rather than something like:</p>
  
  <pre><code>exampleF [] = []
  exampleF (x:xs) = (map toLower x) : exampleF xs
  </code></pre>