andThen

andThen(result, fn)

Transforms a Result into another one by applying the provided function to the Ok value and returning its result as-is.

If the result is an Err, it is returned unchanged.

data-first

andThen(ok(0), (num) => ok(num + 1)); //=> ok(1)
andThen(ok(0), (num) => err(num + 1)); //=> err(1)
andThen(okP(0), async (num) => ok(num + 1)); //=> okP(1)
andThen(okP(0), async (num) => err(num + 1)); //=> errP(1)
andThen(okP(0), async (num) => okP(num + 1)); //=> okP(1)
andThen(okP(0), async (num) => errP(num + 1)); //=> errP(1)

data-last

pipe(
    ok(0),
    andThen((num) => ok(num + 1)),
); //=> ok(1)

pipe(
    ok(0),
    andThen((num) => err(num + 1)),
); //=> err(1)

pipe(
    okP(0),
    andThen(async (num) => ok(num + 1)),
); //=> okP(1)

pipe(
    okP(0),
    andThen(async (num) => err(num + 1)),
); //=> errP(1)

pipe(
    okP(0),
    andThen(async (num) => okP(num + 1)),
); //=> okP(1)

pipe(
    okP(0),
    andThen(async (num) => errP(num + 1)),
); //=> errP(1)