mapOr

function Result.mapOr(
    result: Result<T, E>,
    transform: (value: T) => U,
    fallback: F
): U | F

Unwraps the Ok value using the transform function, or returns the fallback value if the result is an Err.

Example

data-first

Result.mapOr(ok(5), (x) => x * 2, 0);
// 10

Result.mapOr(err("fail"), (x) => x * 2, 0);
// 0

data-last

pipe(
    ok(5),
    Result.mapOr((x) => x * 2, 0),
);
// 10