Tuple
- Rust course
- Beginner
- Lesson 16/115
- 4 min
Group different types in a single value with a tuple.
Tuples
A tuple holds a fixed number of values of different types together. Elements are reached with .0, .1, or destructured with let:
let kisi: (&str, u32, bool) = ("Ada", 36, true);
println!("{}", kisi.0); // Ada
let (ad, yas, _) = kisi;
println!("{ad} {yas}");A tuple is the easiest way to return several values from a function: fn min_max(...) -> (i32, i32).
Returning a tuple
A function that returns the quotient and remainder together:
fn bol(a: i32, b: i32) -> (i32, i32) {
(a / b, a % b)
}
let (bolum, kalan) = bol(17, 5);
println!("{bolum} {kalan}"); // 3 2For larger data whose elements have meaning, a struct with named fields is preferred over a tuple; what kisi.1 means is forgotten over time.
Practice Quotient and remainder
Write the fn bol(a: i32, b: i32) -> (i32, i32) function. Destructure with let (q, r) = bol(17, 5); and print println!("{q} {r}");.
Starter code
fn main() {
// buraya yaz
}Sample solution
fn bol(a: i32, b: i32) -> (i32, i32) {
(a / b, a % b)
}
fn main() {
let (q, r) = bol(17, 5);
println!("{q} {r}");
}Expected output
3 2
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What does the empty tuple <code>()</code> represent?
- null
- An empty array
- "No value"; the unit type Correct answer
- An error
Explanation: Functions that return no value actually return (); println! returns () too.
2 Second element
let nokta = (3, 7);
println!("{}", nokta.____); // 7let nokta = (3, 7);
println!("{}", nokta.1); // 7Explanation: Tuple elements are read with .0, .1, starting at 0.
3 Expression and result
| Term | Meaning |
|---|---|
(1, "a").1 |
"a" |
let (x, _) = (5, 6) |
x = 5 |
() |
Unit type |
(a / b, a % b) |
Returns two values |