break and continue

If you want to exit a loop early, use break, if you want to immediately start the next iteration use continue. Both continue and break can optionally take a label argument which is used to break out of nested loops:

1. fn main() {
2. let v = vec![10, 20, 30];
3. let mut iter = v.into_iter();
4. 'outer: while let Some(x) = iter.next() {
5. println!("x: {x}");
6. let mut i = 0;
7. while i < x {
8. println!("x: {x}, i: {i}");
9. i += 1;
10. if i == 3 {
11. break 'outer;
12. }
13. }
14. }
15. }

In this case we break the outer loop after 3 iterations of the inner loop.