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Implement Semigroup via unionWith #23

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Merged
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Dec 28, 2020
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Implement Semigroup via unionWith #23

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2 changes: 1 addition & 1 deletion src/Foreign/Object.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -280,7 +280,7 @@ mapWithKey :: forall a b. (String -> a -> b) -> Object a -> Object b
mapWithKey f m = runFn2 _mapWithKey m f

instance semigroupObject :: (Semigroup a) => Semigroup (Object a) where
append m1 m2 = mutate (\s1 -> foldM (\s2 k v1 -> OST.poke k (runFn4 _lookup v1 (\v2 -> v1 <> v2) k m2) s2) s1 m1) m2
append = unionWith (<>)

instance monoidObject :: (Semigroup a) => Monoid (Object a) where
mempty = empty
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