Rust Brain Teasers

Puzzle 9

Out of Order

out_of_order/src/main.rs

fn main() {
    let mut floats = vec![3.1, 1.2, 4.5, 0.3];
    floats.sort();

    println!("{:#?}", floats);
}

Guess the Output
	Try to guess what the output is before moving to the next page.

The program will fail to compile, and you’ll receive the following error message:

the trait `Ord` is not implemented for `{float}`

Discussion

Rust makes it easy to sort vectors of most types. A vector’s ...