[Haskell-cafe] Length of lists within list of lists?

Alexandru Scvortov scvalex at gmail.com
Sat Apr 10 15:09:58 EDT 2010

someMethod :: [[a]] -> [Int]
someMethod = map length

There's a list, haskell-beginners better suited for this kind of question.


On Saturday 10 April 2010 18:02:37 boblettoj 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

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