const Functor = (x) => ({
	map: (f) => Functor(f(x)),
	fold: (f) => f(x)
});


const Right = (x) => ({
	map: (f) => Right(f(x)),
	fold: (f, g) => g(x),
	join: () => x,
	chain: function (f) {
		return Right(this.map(f).join());
	}
});

const Left = (x) => ({
	map: (f) => Left(x),
	fold: (f, g) => f(x),
	join: () => x,
	chain: function (f) {
		return Left(this.map(f).join());
	}
});

const Maybe = (x) => !!x ? Right(x) : Left(null);

const tryCatch = (x) => ({
	map: (f) => {
		try {
			const newVal = f(x);
			return Right(x);
		}
		catch (err) {
			return Left(err);
		}
	},
	fold: (f, g) => Maybe(x).fold(f, g),
	join: () => x,
	chain: function (f) {
		return tryCatch(this.map(f).join());
	}
});