Created
April 13, 2015 09:18
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List and Writer
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| {-# LANGUAGE FlexibleContexts #-} | |
| import Control.Monad.Writer | |
| listify :: Writer [a] () -> [a] | |
| listify = execWriter | |
| item x = tell [x] | |
| main = do | |
| print $ unwords $ listify $ do | |
| item "hello" | |
| item "world!" |
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