Function fold

fold<R extends UnknownTernaryResult, S2, W2, E2>(
    result: R,
    mapOk: (value: UnwrapOk<R>) => S2,
    mapWarn: (value: UnwrapWarn<R>) => W2,
    mapErr: (error: UnwrapErr<R>) => E2,
): TernaryResult<S2, E2, W2>
Applies the provided mapper based on the current variant.
Type Parameters
- R extends UnknownTernaryResult
- S2
- W2
- E2
Parameters
- result: R
- mapOk: (value: UnwrapOk<R>) => S2
- mapWarn: (value: UnwrapWarn<R>) => W2
- mapErr: (error: UnwrapErr<R>) => E2
Returns TernaryResult<S2, E2, W2>
Example
```
const okFold = TernaryResult.fold(
  TernaryResult.ok(2),
  (value) => value * 2,
  (warn: string) => warn.length,
  (error: string) => error.toUpperCase(),
);

const warnFold = TernaryResult.fold(
  TernaryResult.warn(2, 'spike'),
  (value: number) => value,
  (warn: string) => warn.toUpperCase(),
  (error: string) => error,
);

assert.deepStrictEqual(okFold, TernaryResult.ok(4));

assert.deepStrictEqual(warnFold, TernaryResult.warn(2, 'SPIKE'));
```
- Defined in src/functional/ternary-result/impl/ternary-result-fold.mts:33

fold<S, W, E, S2, W2, E2>(
    mapOk: (value: S) => S2,
    mapWarn: (value: W) => W2,
    mapErr: (error: E) => E2,
): (result: TernaryResult<S, E, W>) => TernaryResult<S2, E2, W2>

Applies the provided mapper based on the current variant.

Type Parameters

Parameters

mapOk: (value: S) => S2
mapWarn: (value: W) => W2
mapErr: (error: E) => E2

Returns (result: TernaryResult<S, E, W>) => TernaryResult<S2, E2, W2>

Example

const okFold = TernaryResult.fold(
  TernaryResult.ok(2),
  (value) => value * 2,
  (warn: string) => warn.length,
  (error: string) => error.toUpperCase(),
);

const warnFold = TernaryResult.fold(
  TernaryResult.warn(2, 'spike'),
  (value: number) => value,
  (warn: string) => warn.toUpperCase(),
  (error: string) => error,
);

assert.deepStrictEqual(okFold, TernaryResult.ok(4));

assert.deepStrictEqual(warnFold, TernaryResult.warn(2, 'SPIKE'));

Function fold

Type Parameters

Parameters

Returns TernaryResult<S2, E2, W2>

Example

Type Parameters

Parameters

Returns (result: TernaryResult<S, E, W>) => TernaryResult<S2, E2, W2>

Example

Settings