Rust Basics

Rust Tuples and Arrays

Group a few values of different types in a tuple, and a fixed number of same-typed values in an array.

Beginner
3 min read
1 runnable example

What you'll learn

Tuples and .0 .1
Arrays with [T; N]
Returning two values

Run code →

scores: [i32; 5]

720

951

582

883

644

Indexes start at 0. The highest score is at index 1.

Fixed-size groups of values

A tuple groups a few values that can have different types. An array holds a fixed number of values of one type, and its length is part of its type.

[i32; 5] is an array of five i32 values. min_max returns two results at once as a tuple, and let (lowest, highest) unpacks them. Tuple fields are read by position with .0 and .1.

Key points

An array's length is part of its type: [i32; 5].
A tuple can mix types: (3, -2.5).
let (a, b) = pair; unpacks a tuple.

Runnable Rust example

Rust

Run code →

main.rs

fn min_max(values: [i32; 5]) -> (i32, i32) {
    let mut min = values[0];
    let mut max = values[0];
    for value in values {
        if value < min {
            min = value;
        }
        if value > max {
            max = value;
        }
    }
    (min, max)
}

fn main() {
    let scores = [72, 95, 58, 88, 64];
    let (lowest, highest) = min_max(scores);

    println!("first: {}, count: {}", scores[0], scores.len());
    println!("lowest: {lowest}, highest: {highest}");

    let point = (3, -2.5);
    println!("x = {}, y = {}", point.0, point.1);
}

Get a Run button for this example Result of running the code

first: 72, count: 5
lowest: 58, highest: 95
x = 3, y = -2.5

Practice

Open the example in the online compiler, change a value or add a line, and predict the output before you run it. Then break the code on purpose and read the compiler's message.

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