Question

How to sort a vector of pairs (list of tuples) based on the first element of the pair in Rust

Answer 1

fn print(vec: &Vec<(i32, i32)>) {
    for &(first, second) in vec {
        println!("{}, {}", first, second);
    }
}

fn main() {
    let mut vec = vec![(3, 8), (5, 2), (-4, 7)];
    
    vec.sort_by(|left, right| {
        left.0.cmp(&right.0)
    });

    print(&vec);
}

 
 
/*
run:

-4, 7
3, 8
5, 2

*/

 

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