I still consider myself a newbie to functional programming, and I still have some trouble wrapping my head around a lot of functional concepts. Anyway, here goes:
import Control.Monad.Writer import Data.Monoid bubblesort' :: (Ord a) => [a] -> Writer Any [a] bubblesort'  = return  bubblesort' [x] = return [x] bubblesort' (x:y:xs) | x > y = tell (Any True) >> bubblesort' (x:xs) >>= return . (y:) | otherwise = bubblesort' (y:xs) >>= return . (x:) bubblesort :: (Ord a) => [a] -> [a] bubblesort xs | nok = bubblesort ys | otherwise = ys where (ys, Any nok) = runWriter (bubblesort' xs)
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