rustRust lang class with constructor example

A constructor in Rust is a function that is called when an instance of a struct is created. It is used to initialize the fields of the struct with the given values.

Below is an example of a Rust class with a constructor:

struct Person {
    name: String,
    age: u8
}

impl Person {
    fn new(name: String, age: u8) -> Person {
        Person {
            name,
            age
        }
    }
}

fn main() {
    let person = Person::new(String::from("John"), 30);
    println!("{} is {} years old", person.name, person.age);
}

Output

John is 30 years old

Explanation:

1. The struct Person defines a struct with two fields, name and age, both of type String and u8 respectively.
2. The impl Person block defines an implementation block for the Person struct.
3. The fn new function is the constructor for the Person struct. It takes two parameters, name and age, both of type String and u8 respectively.
4. The let person statement creates an instance of the Person struct using the Person::new constructor.
5. The println! statement prints out the name and age of the person instance.

Helpful links:

1. Rust Structs
2. Rust Constructors

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