this post was submitted on 05 Jul 2025
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Programmer Humor

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Learning to program in rust (programming.dev)
submitted 1 day ago by KernelPanic@programming.dev to c/programmer_humor@programming.dev
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[–] kubica@fedia.io 65 points 1 day ago (12 children)

The weird part of rust is replacing straight forward semicolons from other languages with the more verbose .unwrap();.

Just kidding, don't lecture me about it.

[–] ImplyingImplications@lemmy.ca 7 points 23 hours ago (2 children)

Me, every time I try searching a Rust question.

That's easy. Just do:

fn is_second_num_positive() -> bool {
    let input = "123,-45";
    let is_positive =
        input.split(',')
        .collect::<Vec<&str>>()
        .last()
        .unwrap()
        .parse::<i32>()
        .unwrap()
        .is_positive();
    is_positive
}
[–] shape_warrior_t@programming.dev 12 points 22 hours ago (1 children)

Can't resist pointing out how you should actually write the function in a "real" scenario (but still not handling errors properly), in case anyone wants to know.

If the list is guaranteed to have exactly two elements:

fn is_second_num_positive_exact(input: &str) -> bool {
    let (_, n) = input.split_once(',').unwrap();
    n.parse::<i32>().unwrap() > 0
}

If you want to test the last element:

fn is_last_num_positive(input: &str) -> bool {
    let n = input.split(',').next_back().unwrap();
    n.parse::<i32>().unwrap() > 0
}

If you want to test the 2nd (1-indexed) element:

fn is_second_num_positive(input: &str) -> bool {
    let n = input.split(',').nth(1).unwrap();
    n.parse::<i32>().unwrap() > 0
}
[–] beeb@lemmy.zip 3 points 12 hours ago* (last edited 12 hours ago)

Even better to use expect with a short message of what the assumption is: "the string should contain a comma" if it ever panics you'll know exactly why.

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