create Maybe from value

[demetere]

Hello,

I would like to know if there is a way to create Some or Nothing based on a value. Specifically, if the value is None, it should create Nothing, and if the value is present, it should be encapsulated within Some.

I saw a great example of this in one of the libraries that was put as an alternative to your repositories. This implementation is the one I am referring.

If this functionality does not currently exist, I am willing to implement it if we can agree on the approach.

[francium]

Hi,

I think a Maybe.from makes sense. But we don't have a Maybe namespace (class) unless the user does import maybe + maybe.from. So maybe we'll want to just do a function most likely such as to_maybe? We could call it from, but the issue then become of 'from' being a very generic name and unless the user does a fully qualified call, maybe.from, it becomes somewhat confusing if from is imported, eg from maybe import from + from(...). I hope that makes sense.

Second question is, that library, dry-python has two versions, from_value and from_optional, I'm not sure if we need both, I don't quite understand the rationale for having two. From what I'm thinking, a single function that handles the from_optional semantics (None | T -> Maybe[T]) should be sufficient.

Perhaps we could clarify these questions first, and then you're welcome to take this on.

[demetere]

I completely agree with you. We can create a function called maybe or, as you mentioned, to_maybe. I've already created a maybe function, but renaming it is a minor issue.

I also find the dry-python decision to have two functions a bit confusing. Perhaps they intended to encapsulate None inside Some, but I don't see many real-world cases for that. In this context, from_optional seems more applicable, and we can consider going this route.