Function mapWarn

mapWarn<R extends UnknownTernaryResult, W2>(
result: R,
mapFn: (warning: UnwrapWarn<R>) => W2,
): TernaryResult<UnwrapOk<R>, UnwrapErr<R>, W2>
Maps the Warn variant while leaving Ok/Err untouched.
Type Parameters
- R extends UnknownTernaryResult
- W2
Parameters
- result: R
- mapFn: (warning: UnwrapWarn<R>) => W2
Returns TernaryResult<UnwrapOk<R>, UnwrapErr<R>, W2>
Example
```
const warnValue = TernaryResult.warn(2, 'slow');

const mappedWarn = TernaryResult.mapWarn(
  warnValue,
  (warning) => `${warning}!`,
);

const okPassthrough = TernaryResult.mapWarn(
  TernaryResult.ok(3),
  (value: number) => value * 2,
);

assert.deepStrictEqual(mappedWarn, TernaryResult.warn(2, 'slow!'));

assert.deepStrictEqual(okPassthrough, TernaryResult.ok(3));
```
- Defined in src/functional/ternary-result/impl/ternary-result-map-warn.mts:28

mapWarn<W, W2>(
mapFn: (warning: W) => W2,
): <S, E>(result: TernaryResult<S, E, W>) => TernaryResult<S, E, W2>

Maps the Warn variant while leaving Ok/Err untouched.

Type Parameters

Parameters

mapFn: (warning: W) => W2

Returns <S, E>(result: TernaryResult<S, E, W>) => TernaryResult<S, E, W2>

Example

const warnValue = TernaryResult.warn(2, 'slow');

const mappedWarn = TernaryResult.mapWarn(
  warnValue,
  (warning) => `${warning}!`,
);

const okPassthrough = TernaryResult.mapWarn(
  TernaryResult.ok(3),
  (value: number) => value * 2,
);

assert.deepStrictEqual(mappedWarn, TernaryResult.warn(2, 'slow!'));

assert.deepStrictEqual(okPassthrough, TernaryResult.ok(3));

Function mapWarn

Type Parameters

Parameters

Returns TernaryResult<UnwrapOk<R>, UnwrapErr<R>, W2>

Example

Type Parameters

Parameters

Returns <S, E>(result: TernaryResult<S, E, W>) => TernaryResult<S, E, W2>

Example

Settings