Data.Either.Extra

Documentation

module Data.Either

isLeft :: Either t t1 -> Bool

isRight :: Either t t1 -> Bool

fromLeft :: Either l r -> l

The fromLeft function extracts the element out of a Left and throws an error if its argument is Right. Much like fromJust, using this function in polished code is usually a bad idea.

fromRight :: Either l r -> r

The fromRight function extracts the element out of a Right and throws an error if its argument is Left. Much like fromJust, using this function in polished code is usually a bad idea.

fromEither :: Either a a -> a

Pull the value out of an Either where both alternatives have the same type.