mapOrElse<U> method
Maps a Result<T, E>
to U
by applying fallback function fallback
to
a contained Err
(failure) value, or function op
to a
contained Ok
(success) value.
This function can be used to unpack a successful result while handliing an error.
Examples
Basic usage:
Result<int, int> x = Ok(9);
expect(
x.mapOrElse(
errMap: (error) => 'Failure: $error',
okMap: (value) => 'Success: $value',
),
'Success: 9',
);
Result<int, int> x = Err(81);
expect(
x.mapOrElse(
errMap: (error) => 'Failure: $error',
okMap: (value) => 'Success: $value',
),
'Failed: 81',
);
Implementation
@override
U mapOrElse<U>({
required U Function(E error) errMap,
required U Function(T value) okMap,
}) {
return errMap(e);
}