How do I interlace two Rust vectors into a new vector?

Question

I need an idiomatic way to interlace these two vectors:

v1 = vec![1.0, 2.0, 3.0];
v2 = vec![4.0, 5.0, 6.0];

The output I expect is:

v3 is [1.0, 4.0, 2.0, 5.0, 3.0, 6.0];

I attempted using itertool's interlace function, but I can't get the iterators to collect to Vec types. It's likely I'm using them wrong.

With std iter : https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=50c0cc820c1ac3b244a3138d2f141407 — Ömer Erden, Dec 10 '19 at 13:14
@ÖmerErden And soon, when `IntoIter` is implemented for arrays, you won't need the weird `once` chaining :) — Boiethios, Dec 10 '19 at 13:18
@FrenchBoiethios I wish tuples had `IntoIter` implementation, until then let's just stick to this `.flat_map(|(x, y)| vec![x,y])` :P — Ömer Erden, Dec 10 '19 at 13:22

score 7 · Accepted Answer · edited Dec 10 '19 at 15:57

Using interleave() function or interleave() method from Itertools crate:

use itertools::{interleave, Itertools};

fn main() {
    let v1 = vec![1.0, 2.0, 3.0];
    let v2 = vec![4.0, 5.0, 6.0];
    let v = interleave(v1, v2).collect::<Vec<_>>();
    dbg!(v);

    let v1 = vec![1.0, 2.0, 3.0];
    let v2 = vec![4.0, 5.0, 6.0];
    let v = v1
        .into_iter()
        .interleave(v2.into_iter())
        .collect::<Vec<_>>();
    dbg!(v);
}

How do I interlace two Rust vectors into a new vector?

1 Answers1