Created
July 24, 2012 04:02
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Maybe Haskell
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| data Perhaps a = Definitely a | NoWay deriving Show | |
| perhapsMap :: (a -> b) -> Perhaps a -> Perhaps b | |
| perhapsMap f (Definitely x) = Definitely (f x) | |
| perhapsMap f NoWay = NoWay | |
| main = do | |
| print $ perhapsMap (+2) (Definitely 10) | |
| print $ perhapsMap (+2) (NoWay) |
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