Function flatMap

flatMap<T, E, U, F>(
result: ResultType<T, E>,
fn: (value: T) => ResultType<U, F>,
): ResultType<U, E | F>
Chain a Result-producing step. If the input is err, fn is skipped; otherwise fn runs and its result (possibly another err) becomes the output. Error channels are unioned.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- E
- U
- F
Parameters
- result: ResultType<T, E>
- fn: (value: T) => ResultType<U, F>
Returns ResultType<U, E | F>
Example
```
pipe(
    parseOrderId(raw),
    Result.flatMap(id => loadOrder(id)),
    Result.flatMap(order => chargePayment(order)),
  )
```
- Defined in result/transform.ts:72
flatMap<T, U, F>(
fn: (value: T) => ResultType<U, F>,
): <E>(result: ResultType<T, E>) => ResultType<U, F | E>
Chain a Result-producing step. If the input is err, fn is skipped; otherwise fn runs and its result (possibly another err) becomes the output. Error channels are unioned.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- U
- F
Parameters
- fn: (value: T) => ResultType<U, F>
Returns <E>(result: ResultType<T, E>) => ResultType<U, F | E>
Example
```
pipe(
    parseOrderId(raw),
    Result.flatMap(id => loadOrder(id)),
    Result.flatMap(order => chargePayment(order)),
  )
```
- Defined in result/transform.ts:76