mapLeft<L2> method

@override Either<L2, R> mapLeft<L2>(L2 f(L left))

Maps the Left value using f, if present.

If this is a Right, the same successful value is returned unchanged.

Implementation

@override
Either<L2, R> mapLeft<L2>(L2 Function(L left) f) {
  return Left<L2, R>(f(value));
}