count-zero-golf.hs

countZeroes :: [String] -> Int
countZeroes = sum . map length . map (filter (=='0'))

countZeroesAgain :: Show a => [a] -> Int
countZeroesAgain = countZeroes . map show

-- and for the one line, because I guess that's the challenge
-- btw, it's type is
-- cz :: Show a => [a] -> Int
-- which means that this function works any list of things that can be printed

cz = sum . map length . map (filter (=='0')) . map show