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| Indexes | Syntax | >> Prelude << | Ratio | Complex | Numeric | Ix | Array | List | Maybe | Char | Monad | IO | Directory | System | Time | Locale | CPUTime | Random |

Module: | Prelude |
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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 : |