for loop

Iterate over an iterator with for.

The for loop

for yields every element of an iterator in turn; it is the most common loop in Rust. Ranges: 0..5 (excluding 5), 1..=5 (including 5):

for i in 1..=3 {
    print!("{i} ");
}
for meyve in ["elma", "armut"] {
    println!("{meyve}");
}
for i in (1..=3).rev() {   // 3 2 1
    print!("{i} ");
}

Index and value

To get the position together with the element, enumerate is used; step_by skips steps:

let isimler = ["Ada", "Can", "Ece"];
for (i, ad) in isimler.iter().enumerate() {
    println!("{}. {}", i + 1, ad);
}
for n in (0..=10).step_by(5) {   // 0 5 10
    print!("{n} ");
}

Exercise Numbered list

Walk the array let gorevler = ["kod yaz", "test et", "yayınla"]; with .iter().enumerate() and print each line as 1. kod yaz.

Show example solution

fn main() {
    let gorevler = ["kod yaz", "test et", "yayınla"];
    for (i, g) in gorevler.iter().enumerate() {
        println!("{}. {}", i + 1, g);
    }
}

Test yourself

Which values does <code>for i in 0..3</code> give?
- 3, 2, 1
- 0, 1, 2
- 0, 1, 2, 3
- 1, 2, 3
Show answer

0, 1, 2 — .. excludes the end; to include it, ..= is used.

Inclusive range

for i in 1____10 {
    toplam += i;
}  // 1'den 10'a (dahil)

Show answer

for i in 1..=10 {
    toplam += i;
}  // 1'den 10'a (dahil)

Expression and values

0..3

0 1 2
1..=3

1 2 3
(1..=3).rev()

3 2 1
(0..=10).step_by(5)

0 5 10

Next lesson: Summary - Control flow

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