For

Itera sobre coleções, intervalos (ranges), ou qualquer iterável, sendo mais seguro que indexação manual, lida com limites automaticamente.

for

#![allow(unused)]
fn main() {
for element in collection {

}
}

0..4

#![allow(unused)]
fn main() {
for i in 0..5 {
    println!("{}", i);
}
}

0..=5

#![allow(unused)]
fn main() {
for i in 0..=5 {
    println!("{}", i);
}
}

.rev = 4..3..2..1..

#![allow(unused)]
fn main() {
for i in (0..5).rev() {
    println!("{}", i);
}
}

#![allow(unused)]
fn main() {
// 5 - 0
for i in (0..=5).rev() {
    println!("{}", i);
}
}

for + &str

#![allow(unused)]
fn main() {
let name: &str = "Rust";
for i in name.chars() {
    println!("{}", i);
}
}

for + array

#![allow(unused)]
fn main() {
let arr = ["Maçã", "Banana", "Laranja", "Goiaba"];
for i in arr {
    println!("{}", i)
}
}

for + array bidimensional

#![allow(unused)]
fn main() {
let arr: [[i32; 3]; 3] = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
];

for i in arr {
    for j in i {
        print!("{}", j);
    }
    println!();
}
}