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Small pattern that made my code much cleaner (lemmy.ca)

submitted 1 year ago by [email protected] to c/rust

9 comments fedilink hide all child comments

This is a really simple silly thing I just realized, but I noticed I have a lot code that looks something like this:

fn foo() -> Result&lt;(), Error> {
    // do something
}

fn bar() -> Option&lt;()> {
    let Ok(f) = foo() else {
        return None;
    };
}

I hated that if-statement. I realized today that I could simplify to:

fn bar() -> Option&lt;()> {
    let f = foo().ok()?;
}

And that cleaned up my code a lot. It's a tiny thing, but when it's okay to discard the error from the result, makes such a big difference when you have a lot of them!

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[–] BB_C 4 points 1 year ago

I don't get it!

If the T in Result (and presumably Option) is (), then why not just use is_ok()/is_err() from the caller side?

Other Tips:

bool has then() and then_some() methods in std now.
You can transpose() in both directions between ResultᐸOptionᐸTᐳᐳs and OptionᐸResultᐸTᐳᐳs