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@kseo
Created March 23, 2016 12:02
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for loop in Haskell
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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