How can I zip more than two iterators?

Question

Is there a more direct and readable way to accomplish the following:

fn main() {
    let a = [1, 2, 3];
    let b = [4, 5, 6];
    let c = [7, 8, 9];
    let         


        

Answer 1

You could also create a macro using the .zip provided like,

$ cat z.rs
macro_rules! zip {
    ($x: expr) => ($x);
    ($x: expr, $($y: expr), +) => (
        $x.iter().zip(
            zip!($($y), +))
    )
}


fn main() {
    let x = vec![1,2,3];
    let y = vec![4,5,6];
    let z = vec![7,8,9];

    let zipped = zip!(x, y, z);
    println!("{:?}", zipped);
    for (a, (b, c)) in zipped {
        println!("{} {} {}", a, b, c);
    }
}

Output:

$ rustc z.rs && ./z
Zip { a: Iter([1, 2, 3]), b: Zip { a: Iter([4, 5, 6, 67]), b: IntoIter([7, 8, 9]), index: 0, len: 0 }, index: 0, len: 0 }
1 4 7
2 5 8
3 6 9