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408

rust blasphemy (added context) (infosec.pub)

submitted 3 days ago* (last edited 2 days ago) by siriusmart@lemmy.world to c/programmer_humor@programming.dev

46 comments fedilink hide all child comments

made in gimp, with <3

Context for actual rust programmers

I was having massive beef with the rust compiler yesterday, every cargo check takes 20 seconds.

And then look at the three functions below, only one of them are Send, if you know why, please let me know.

(Note: value that is not Send cannot be held across an await point, and Box is not Send)

async fn one() {
    let res: Result<(), Box<dyn Error>> = do_stuff();
    if let Err(err) = res {
        let content = err.to_string();
        let _ = do_stuff(content).await;
    }
}

async fn two() {
    let res: Result<(), Box<dyn Error>> = do_stuff();
    let content = if let Err(err) = res {
        Some(err.to_string())
    } else {
        None
    };
    drop(res);
    if let Some(content) = content {
        let _ = do_stuff(content).await;
    }
}

async fn three() {
    let content = {
        let res: Result<(), Box<dyn Error>> = do_stuff();
        if let Err(err) = res {
            Some(err.to_string())
        } else {
            None
        }
    };
    if let Some(content) = content {
        let _ = do_stuff(content).await;
    }
}

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[–] tatterdemalion@programming.dev 37 points 3 days ago (1 children)

People who've never used Rust or only used it once and couldn't grok it like to meme that Rust is bad to cope.

[+] firelizzard@programming.dev -8 points 2 days ago (1 children)

Yes, preferring a language that’s easy to read and therefore easy to maintain over a language like Rust is definitely coping 🙄

[–] WhyJiffie@sh.itjust.works 21 points 2 days ago (1 children)

preferring Rust over Rust? what do you mean?

do you think loosely typed python is easy to read and maintain?

[–] firelizzard@programming.dev 1 points 2 days ago (1 children)

I’ll stick with Go TYVM

[–] edinbruh@feddit.it 8 points 2 days ago* (last edited 2 days ago) (1 children)

Yeah, like, who would ever want to

stuff1()?.map(stuff2);

It's much better to just:

err, value = stuff1();
if err == nil 
    return err, nil;
if value != nil
    stuff2(value);

And you might even:

for a in vec {
    vec[a]
}

[–] firelizzard@programming.dev 3 points 2 days ago (1 children)

I totally agree, that Go snippet is absolutely more maintainable. Though you forgot the curly braces and the semicolons are unnecessary.

[–] AeonFelis@lemmy.world 2 points 2 days ago (1 children)

Though you forgot the curly braces and the semicolons are unnecessary.

Yup. These are pretty big issues. But there are also some minor, trivial, purely-preference-based issues - like returning an error if err == nil instead of when it isn't.

[–] firelizzard@programming.dev 1 points 1 day ago (1 children)

😆 yeah I didn’t read it that hard

[–] AeonFelis@lemmy.world 2 points 1 day ago* (last edited 1 day ago) (1 children)

In your defense, it's written in the only "modern" programming language that encourage this category of errors.

[–] firelizzard@programming.dev 1 points 1 day ago

I’m still far happier with it than literally any other programming language I’ve ever used