You need a method that will find the length of a list: length :: [a] -> Int and a method that will applies a function to every element of a list and make a list of the results: map :: (a ->b) -> [a] -> [b]
Try and put them together. hth, -deech On 4/10/10, boblettoj <[email protected]> wrote: > > Hi i want to know if there is any method i can use to count the number of > items in each list in a list of lists, eg. > > someMethod [[a, b, c], [a], [b, d, e, f]] > would return [3, 1, 4] > > is there anything that can do this? > thanks > > -- > View this message in context: > http://old.nabble.com/Length-of-lists-within-list-of-lists--tp28203363p28203363.html > Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. > > _______________________________________________ > Haskell-Cafe mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
