Function unwrapErrOr

unwrapErrOr<R extends UnknownResult, D>(
result: R,
defaultValue: D,
): D | UnwrapErr<R>
Unwraps a Result, returning the error value or a default value if it is Result.Ok.
Type Parameters
- R extends UnknownResult
  The UnknownResult type to unwrap.
- D
  The type of the default value.
Parameters
- result: R
  The Result to unwrap.
- defaultValue: D
  The value to return if result is Result.Ok.
Returns D | UnwrapErr<R>
The error value if Result.Err, otherwise defaultValue.
Example
```
const okResult = Result.ok('success');

const errResult = Result.err('failure');

assert.isTrue(Result.unwrapErrOr(okResult, 'default') === 'default');

assert.isTrue(Result.unwrapErrOr(errResult, 'default') === 'failure');

const unwrapError = Result.unwrapErrOr('fallback error');

assert.isTrue(unwrapError(Result.err('boom')) === 'boom');

assert.isTrue(unwrapError(Result.ok('no error')) === 'fallback error');
```
- Defined in src/functional/result/impl/result-unwrap-err-or.mts:32

unwrapErrOr<D>(defaultValue: D): <S, E>(result: Result<S, E>) => D | E

Unwraps a Result, returning the error value or a default value if it is Result.Ok.

Type Parameters

D
The type of the default value.

Parameters

defaultValue: D
The value to return if result is Result.Ok.

Returns <S, E>(result: Result<S, E>) => D | E

The error value if Result.Err, otherwise defaultValue.

Example

const okResult = Result.ok('success');

const errResult = Result.err('failure');

assert.isTrue(Result.unwrapErrOr(okResult, 'default') === 'default');

assert.isTrue(Result.unwrapErrOr(errResult, 'default') === 'failure');

const unwrapError = Result.unwrapErrOr('fallback error');

assert.isTrue(unwrapError(Result.err('boom')) === 'boom');

assert.isTrue(unwrapError(Result.ok('no error')) === 'fallback error');

Function unwrapErrOr

Type Parameters

Parameters

Returns D | UnwrapErr<R>

Example

Type Parameters

Parameters

Returns <S, E>(result: Result<S, E>) => D | E

Example

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