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Add Semiring and Semigroup instances #13

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Merged
garyb merged 1 commit into from
Aug 14, 2015
Merged

Add Semiring and Semigroup instances #13

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2 changes: 2 additions & 0 deletions docs/Data/Either.md
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Expand Up @@ -31,6 +31,8 @@ instance foldableEither :: Foldable (Either a)
instance bifoldableEither :: Bifoldable Either
instance traversableEither :: Traversable (Either a)
instance bitraversableEither :: Bitraversable Either
instance semiringEither :: (Semiring b) => Semiring (Either a b)
instance semigroupEither :: (Semigroup b) => Semigroup (Either a b)
```

#### `either`
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9 changes: 9 additions & 0 deletions src/Data/Either.purs
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Expand Up @@ -225,3 +225,12 @@ instance bitraversableEither :: Bitraversable Either where
bitraverse _ g (Right b) = Right <$> g b
bisequence (Left a) = Left <$> a
bisequence (Right b) = Right <$> b

instance semiringEither :: (Semiring b) => Semiring (Either a b) where
one = Right one
mul x y = mul <$> x <*> y
zero = Right zero
add x y = add <$> x <*> y

instance semigroupEither :: (Semigroup b) => Semigroup (Either a b) where
append x y = append <$> x <*> y