Is there any difference in these approaches to iterate through a vector?

Question

Is there any difference in the following approaches to iterate through a vector? Both methods successfully iterate.

let vo = vec![30, 50, 70, 80];

Method 1

for uu in vo.iter() {
    println!("uu {}", uu);
}
println!("vo 1 {:?}", vo);

Method 2

for uu in &vo {
    println!("{}", uu);
}
println!("vo 2 {:?}", vo);

See also: https://stackoverflow.com/questions/43036279/what-does-it-mean-to-pass-in-a-vector-into-a-for-loop-versus-a-reference-to-a — E_net4 - Krabbe mit Hüten, Jun 16 '20 at 14:12

score 1 · Answer 1 · answered Jun 16 '20 at 14:12

No difference, no.

The second one is impl<'a, T> IntoIterator for &'a Vec<T>, and it just call the first one (Vec::iter). Since the method is so short, there's roughly 100% chances it's going to get inlined and you'll get the same result (with an intermediate function call if you're compiling without optimisations but that's about it).

Is there any difference in these approaches to iterate through a vector?

1 Answers1

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