:: a -> Maybe b -> Either a b package:from-sum

Convert a Maybe to an Either. If the Maybe is Just, then return the value in Right.

>>> maybeToEither 3 $ Just "hello"
Right "hello"

If the Maybe is Nothing, then use the given e as Left.

>>> maybeToEither 3 Nothing
Left 3

A fliped version of maybeToEither.

>>> maybeToEitherOr (Just "hello") 3
Right "hello"

>>> maybeToEitherOr Nothing 3
Left 3