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Port Maybe's Generic instance to this repo #55

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Dec 25, 2020
Merged

Port Maybe's Generic instance to this repo #55

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3 changes: 3 additions & 0 deletions src/Data/Maybe.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import Control.Plus (class Plus)

import Data.Eq (class Eq1)
import Data.Functor.Invariant (class Invariant, imapF)
import Data.Generic.Rep (class Generic)
import Data.Ord (class Ord1)

-- | The `Maybe` type is used to represent optional values and can be seen as
Expand Down Expand Up @@ -216,6 +217,8 @@ instance showMaybe :: Show a => Show (Maybe a) where
show (Just x) = "(Just " <> show x <> ")"
show Nothing = "Nothing"

derive instance genericMaybe :: Generic (Maybe a) _

-- | Takes a default value, a function, and a `Maybe` value. If the `Maybe`
-- | value is `Nothing` the default value is returned, otherwise the function
-- | is applied to the value inside the `Just` and the result is returned.
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