Seems like an interesting effort. A developer is building an alternative Java-based backend to Lemmy's Rust-based one, with the goal of building in a handful of different features. The dev is looking at using this compatibility to migrate their instance over to the new platform, while allowing the community to use their apps of choice.

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[–] Rooki@lemmy.world -1 points 10 months ago (12 children)

That i dont understand? How can it be a result that i need to handle? If its not correct than java will throw an error. ( As expected, shit in shit out )

[–] kattenluik@feddit.nl 4 points 10 months ago* (last edited 10 months ago) (11 children)

It's a great and probably the best error system I've seen, instead of just throwing errors and having bulky try catch statements and such there's just a result type.

Say you have a function that returns a boolean in which something could error, the function would return a Result<bool, Error> and that's it. Calling the function you can choose to do anything you want with that possible Error, including ignoring it or logging or anything you could want.

It's extremely simple.

[–] uranibaba@lemmy.world 1 points 10 months ago (10 children)

If I except a boolean, there is an error and get a Result, is Result an object? How do I know if I get a bool or error?

[–] kattenluik@feddit.nl 1 points 10 months ago* (last edited 10 months ago) (1 children)

Here's some examples written on my phone:

match result {
    Ok(bool_name) => whatever,
    Err(error_type) => whatever,
}

if let Ok(bool_name) = result {
    whatever
}

if result.is_ok() {
    whatever
}

let whatever = result.unwrap_or_default();
let whatever = result?;

And there's many other awesome ways to use a Result including turning it into an Option or unwrapping it unsafely. I recommend you just search "Rust book" on your search engine and browse it. Here's the docs to the Result enum.

[–] uranibaba@lemmy.world 1 points 10 months ago (1 children)

Ah, so it is like a wrapper enum, ok contains the data type you want and err the error object?

[–] kattenluik@feddit.nl 1 points 10 months ago

Exactly! The other wrapper enum I named (Option) is the same kind of concept but with Some(value) and None.

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