Created
March 23, 2016 12:02
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for loop in Haskell
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| import Control.Monad | |
| import Control.Monad.ST | |
| import Data.STRef | |
| sumST :: Num a => [a] -> a | |
| sumST xs = runST $ do | |
| n <- newSTRef 0 | |
| forM_ xs $ \x -> modifySTRef n (+x) | |
| readSTRef n | |
| sum_ :: Num a => [a] -> a | |
| sum_ = foldr (+) 0 | |
| main = do | |
| let xs = [1..10] | |
| print $ sumST xs | |
| print $ sum_ xs |
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