Function tap

tap<T, E>(result: ResultType<T, E>, fn: (value: T) => void): ResultType<T, E>
Run a side effect on the success value without altering the result. The original ok or err flows through unchanged — useful for logging, metrics, or debugging inside a pipe.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- E
Parameters
- result: ResultType<T, E>
- fn: (value: T) => void
Returns ResultType<T, E>
Example
```
pipe(
    parseOrder(raw),
    Result.tap(order => logger.info("parsed", order.id)),
    Result.flatMap(chargePayment),
  )
```
- Defined in result/transform.ts:105
tap<T>(
fn: (value: T) => void,
): <E>(result: ResultType<T, E>) => ResultType<T, E>
Run a side effect on the success value without altering the result. The original ok or err flows through unchanged — useful for logging, metrics, or debugging inside a pipe.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
Parameters
- fn: (value: T) => void
Returns <E>(result: ResultType<T, E>) => ResultType<T, E>
Example
```
pipe(
    parseOrder(raw),
    Result.tap(order => logger.info("parsed", order.id)),
    Result.flatMap(chargePayment),
  )
```
- Defined in result/transform.ts:106