for

for x in 1..5 {
  dbg!(x);
}
// it prints: x=1, x=2, x=3, x=4
// note that 5 is exclusive
// also note x is not pre-defined. Outside of the for loop,
// x is not accessible

for x in 1..=5 {
    dbg!(x);
}
// now 5 is inclusive

for elem in [2, 4, 6] {
   dbg!(elem);
}
// iterate an array

break with a label

fn main() {
    let data = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
    let target = 2;
    let mut searched = 0;
    'out_label: for i in 0..=2 {
        for k in 0..=2 {
            searched += 1;
            if data[i][k] == target {
                break 'out_label;
            }
        }
    }
    dbg!(searched);
}