trait

Traits in Rust are kind of like interfaces in other languages, except they only define methods, no fields of e.g., strings, ints, etc. It’s not a data structure/object.

Traits define a behavior.

The naming convention for traits: it should be a verb, and in PascalCase. Examples: Display, Debug, Clone.

You also use the impl keyword to implement a trait.`

trait Drivable {
    fn left(self);
    fn right(self);
    fn forward(self);
    fn backward(self);
}

struct Car {
    make: String,
    mileage: i32,
    x: i32,
    y: i32,
}

impl Car {
    pub fn new(make: String) -> Self {
        Car {
            make,
            x: 0,
            y: 0,
            mileage: 0,
        }
    }
}

impl Drivable for Car {
    fn left(mut self) {
        self.x -= 1;
    }
    fn right(mut self) {
        self.x += 1;
    }
    fn forward(mut self) {
        self.y += 1;
    }
    fn backward(mut self) {
        self.y -= 1;
    }
}

let volvo = car::Car::new(String::from("volvo"));
volvo.forward();