Re: [Haskell-beginners] matching the output of a standard function to my function definition (non-exhaustive pattern problem)

On Mon, Sep 27, 2010 at 06:15:22PM +0200, Martin Tomko wrote:

Dear Daniel that worked perfectly, thanks for the suggestion!

One more question: how do you use null to check for empty lists? something like [] == null did not work ... just chekcing, I got my orignal code to work, thanks again! Martin

When in doubt, consult the types! null :: [a] -> Bool That is, null is a function for testing lists to see whether they are empty. So rather than 'list == null' you write 'null list'. -Brent