Like or, but using a function to construct the alternative
Result.
Sometimes you need to perform an operation using other data in the environment
to construct the fallback value. In these situations, you can pass a function
(which may be a closure) as the elseFn to generate the fallback Result<T>.
It can then transform the data in the Err to something usable as an
Ok, or generate a new Err instance as appropriate.
Like
or, but using a function to construct the alternativeResult.Sometimes you need to perform an operation using other data in the environment to construct the fallback value. In these situations, you can pass a function (which may be a closure) as the
elseFnto generate the fallbackResult<T>. It can then transform the data in theErrto something usable as anOk, or generate a newErrinstance as appropriate.Useful for transforming failures to usable data.