Structs
A struct (short for "structure") is a custom data structure that lets you group related values together.
You can think of a struct like a mini-database for one thing, like a person with a name and age.
Create a Struct
You define a struct using the struct keyword and place the fields (variables) inside:
Example
struct Person {
name: String,
age: u32, can_vote: bool,
}Once you have a struct, you can create an object of it.
Then, you can access the fields of the struct using dot syntax ( . ):
Example
// Create a Struct called Person
struct Person {
name: String, age: u32, can_vote: bool, }
// Create a Person object
let user = Person {
name: String::from("John"), age: 35, can_vote: true, };
// Access and print the values
println!("Name: {}", user.name);
println!("Age: {}", user.age);
println!("Can vote? {}", user.can_vote);Fields are similar to variables, but they belong to a struct. Since they are part of a larger structure (like Person or Car), they are called fields in Rust, not regular variables.
Change a Field
To change a value inside a struct, you must make the struct object mutable by using mut :
Example
struct Person {
name: String, age: u32, }
let mut user = Person {
name: String::from("John"), age: 35, };
user.age = 36; // Change value of age
println!("Name: {}", user.name);
println!("Updated age: {}", user.age);Why Use Structs?
- To group related data in a clean way
- To make your code easier to read and maintain
- To create real-world examples, like users, books, cars, etc.