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| Module: | Prelude |
|---|---|
| Datatype: | Maybe |
| Description: | The Maybe type is an instance of classes Functor, Monad, and MonadPlus. The function maybe is found in the Prelude. |
| Definition: | data Maybe a = Nothing | Just a deriving (Eq, Ord, Read, Show) |
| In function types: | Maybe a : a -> Maybe a : a -> (b -> a) -> Maybe b -> a : maybe a -> [(a,b)] -> Maybe b : lookup Maybe : |