($) :: (a -> b) -> a -> b
f $ x = f x sum (map sqrt [1..130])
-- zu
sum $ map sqrt [1..130]
-- oder
sqrt (3 + 4 + 9)
-- zu
sqrt $ 3 + 4 + 9 ($) :: (a -> b) -> a -> b
f $ x = f x sum (map sqrt [1..130])
-- zu
sum $ map sqrt [1..130]
-- oder
sqrt (3 + 4 + 9)
-- zu
sqrt $ 3 + 4 + 9