unwrapErrOrElse abstract method

  1. @useResult
E unwrapErrOrElse(
  1. E calculateDefaultError(
    1. T value
    )
)

Returns the contained error, if any, or the result of calculateDefaultError otherwise.

Examples

// prints "other"
print(const Ok<int, String>(2).unwrapErrOrElse((_) => 'other'));

// prints "error"
print(const Err<int, String>('error').unwrapErrOrElse((_) => 'other'));

Implementation

@useResult
E unwrapErrOrElse(E Function(T value) calculateDefaultError);