map<L, C> method
Implementation
Either<L, C> map<L, C>(C Function(R) f) => _either.fold(
(_) => Left<L, C>((_either as Left)._value),
(R r) => Right<L, C>(f(this._value)));
Either<L, C> map<L, C>(C Function(R) f) => _either.fold(
(_) => Left<L, C>((_either as Left)._value),
(R r) => Right<L, C>(f(this._value)));