Basic Structs in Rust

Snippet

Basic Structs in Rust

Structs are custom data types that let you package related values together. They are similar to classes in other languages but without methods. In this example, we define a User struct with three fields. Instances are created using struct literal syntax. The entire struct can be made mutable with mut, and individual fields are accessed using dot notation.

snippet.rs

rust

struct User {
    username: String,
    email: String,
    active: bool,
}
 
fn main() {
    let user1 = User {
        email: String::from("[email protected]"),
        username: String::from("testuser"),
        active: true,
    };
    
    println!("User: {} ({})", user1.username, user1.email);
    
    let mut user2 = user1;
    user2.username = String::from("newuser");
    println!("Updated: {}", user2.username);
}

Breakdown

struct User {

Defines a new struct type named User

username: String,

Field storing the username as a String

let user1 = User { ... };

Creates an instance of User struct

let mut user2 = user1;

Ownership moves to user2, making user1 invalid

user2.username = ...

Modifies the username field since user2 is mutable

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