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Compact `match` in Rust

Published at

9/17/2023

Categories

rust

optimization

code

formatting

Author

rsk

Main Article

https://dev.to/rsk/compact-match-in-rust-1f6c

Categories

4 categories in total

Author

3 person written this

Compact `match` in Rust

match often used to work with enums, let's look at this example:

enum NextStep {
    TurnLeft,
    TurnRight
}

fn main() {
    let next_step = NextStep::TurnLeft;
    match next_step {
        NextStep::TurnLeft => println!("turn left"),
        NextStep::TurnRight => println!("turn right"),
    }
}

It may not be obvious, but enums in Rust can be brought into the current namespace, allowing for more compact code:

// ...
    use NextStep::*;
    match next_step {
        TurnLeft => println!("turn left"),
        TurnRight => println!("turn right"),
    }
// ...

And, to limit the effect to just match, you will have to set boundaries using {} for an additional scope:

// ...
    {
        use NextStep::*;
        match next_step {
            // ...
        }
    }
// ...

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