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Add instances for Maybe #25

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Merged
merged 1 commit into from
Jan 26, 2020
Merged

Add instances for Maybe #25

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3 changes: 3 additions & 0 deletions src/Data/Unfoldable.purs
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Expand Up @@ -41,6 +41,9 @@ class Unfoldable1 t <= Unfoldable t where
instance unfoldableArray :: Unfoldable Array where
unfoldr = unfoldrArrayImpl isNothing (unsafePartial fromJust) fst snd

instance unfoldableMaybe :: Unfoldable Maybe where
unfoldr f b = fst <$> f b

foreign import unfoldrArrayImpl
:: forall a b
. (forall x. Maybe x -> Boolean)
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3 changes: 3 additions & 0 deletions src/Data/Unfoldable1.purs
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Expand Up @@ -41,6 +41,9 @@ class Unfoldable1 t where
instance unfoldable1Array :: Unfoldable1 Array where
unfoldr1 = unfoldr1ArrayImpl isNothing (unsafePartial fromJust) fst snd

instance unfoldable1Maybe :: Unfoldable1 Maybe where
unfoldr1 f b = Just (fst (f b))

foreign import unfoldr1ArrayImpl
:: forall a b
. (forall x. Maybe x -> Boolean)
Expand Down