unwrap with fun or unwrap_or_else

[cottinisimone]

I was wondering if could be useful to modify the unwrap function in order to accept a function as second param (matching).
The implementation:

@spec unwrap(any()) :: any()
def unwrap(a, b \\ nil)
def unwrap({:ok, a}, _), do: a
def unwrap({:error, error}, or_else) when is_function(or_else, 1), do: or_else.(error)
def unwrap(_, default), do: default

Otherwise what about something like the rust unwrap_or_else function in Result?

In my mind could be very useful when you want to get the either :ok value or raise the :error. Or maybe when you need to transform the error into something else.

What do you think?

Thank you, Simone

[sphaso]

Hi, sorry for the late reply!
what you're suggesting is remarkably similar to the either function. The latter case could be handled by passing a function in the fail case such as fn _ -> default.
What do you think? Maybe it's more ergonomic the way you've suggested, I wouldn't mind another opinion :)

[cottinisimone]

Maronn, you are right. Second time fail :)