map

function ResultAsync.map(
    result: AwaitableResult<T, E>,
    transform: (value: T) => U | Promise<U>
): ResultAsync<U, E>

Transforms the value inside an Ok result using the transform function. If the result is an Err, it returns the Err unchanged.

Example

data-first

await ResultAsync.map(ok(5), (x) => x * 2);
// Ok<number>

await ResultAsync.map(err("fail"), (x) => x * 2);
// Err<string>

data-last

await pipe(
    ok(5),
    ResultAsync.map((x) => x * 2),
);
// Ok<number>