Re: Maximum value in a list

sashan wrote:

Hi

I was reading through the tutorial Yet Another Haskell Tutorial and doing chapter 3 ex 5, write a function using foldr and max to return the maximum value in a list.

I came up with the following that will work for positive numbers.

maxInList :: [Int]->Int maxInList [] = 0 maxInList l = foldr max 0 l

Is there an identity for the max function? Because currently if the list [-1,-3,-4] is passed to maxInList it will return 0.

Hint: Find a better value than `0` to give as the second argument to `foldr`. Dean