Flash cards
Review the key moves
What is the main idea behind Rust Tuples?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___ person = ("John", 30, true);Put the learning moves in the order that makes the concept easiest to apply.
Tuples
A tuple is a group of values of different types, stored in a single variable.
Tuples are useful when you want to return or work with multiple values together.
Create a Tuple
Tuples are written using parentheses () , with values separated by commas:
Example
let person = ("John", 30, true);This tuple contains a &str , an i32 , and a bool .
Access Tuple Values
You can access tuple values by using a dot . followed by the index:
Example
let person = ("John", 30, true);
println!("Name: {}", person.0);
println!("Age: {}", person.1);
println!("Is active: {}", person.2);Unpack a Tuple
When we create a tuple, we normally assign values to it. This is called "packing" a tuple:
Example
let person = ("Jenny", 45, false);But, in Rust, we are also allowed to extract the values back into variables. This is called "unpacking":
Example
let person = ("Jenny", 45, false);
let (name, age, active) = person;
println!("Name: {}", name);
println!("Age: {}", age);
println!("Active: {}", active);Return a Tuple from a Function
Tuples are often used to return multiple values from a function:
Example
fn get_user() -> (String, i32) {
(String::from("Liam"), 25)
}
fn main() {
let user = get_user();
println!("User: {} ({} years old)", user.0, user.1);
}