Support request - Example with async/await ?

[drupol]

Hello,

I'm trying to use this library with methods that are async:

In the following example, the method find() is async.

documents = Either.pure(self.database.collection.find())

Things are getting more complex when I try to use methods like fmap later on:

documents.fmap(...)

In this case, this is not going to work because self.database.collection.find() returns something that need to be awaited. Then, to fix the issue, I have to create 2 monads:

documents = await Either.pure(self.database.collection.find()).to_optional()

return Either.pure(documents).fmap(...)

Do you think this is how it is supposed to be used?

So I am opening this issue to have some information and best practices when it comes to mixing a monad with this kind of async way of working. Do you recommend something?

Thanks!

[edeckers]

Hi! I'm a bit too busy at the moment to look into the options, but I didn't want to leave you hanging here. So in short: I have never used the library in async/await context and I didn't build it with concurrency in mind, therefore I don't have a cut and dried answer for you.

My intuitive solution to support your need would be to add *_async variants of the readily availble methods, but when the maker of LanguageExt says he is "kind of sick" of this exact approach in his exemplar library then I'm going to take this as a fair warning and not go down that path.

Problem with this choice is that I need to really deep dive into alternative solutions, for which I do not have the time at the moment unfortunately. Seems like Louthy proposed alternative solutions with IO-monads and the like in the discussion I linked, which sounds like something that could work for Pyella as well.

I'll look into it when I find the time, because I think it is interesting, but it might take a while. If you feel like it, you could do some research and post it here, so it will make it easier for me or us to add to Pyella.

[drupol]

Thank you for taking the time to reply.

No worries about the time it takes, it's totally fine, no worries, I was just curious... so there's no hurry for me on this.

Have a good day!