Rust Examples

owners_move_error.rs

fn main() {
    let original_owner = String::from("Something");
    let new_owner = original_owner;
    
    println!("{}", original_owner);
}

test_example.rs

// A public function that takes two integers and returns double their sum
pub fn add_and_double(x: i32, y: i32) -> i32 {
    2 * _add(x, y)
}

// A private helper function that adds two integers
fn _add(x: i32, y: i32) -> i32 {
    x + y
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_add_and_double() {
        assert_eq!(add_and_double(2, 3), 10);
        assert_eq!(add_and_double(0, 0), 0);
    }

    #[test]
    fn test_add() {
        assert_eq!(_add(2, 3), 5);
        assert_eq!(_add(0, 0), 0);
    }
}

traits_cross.rs

fn cross_the_pond(animal: impl Swim) {
    animal.swim();
}

traits_duck.rs

struct Duck {
    name: String,
}

impl Swim for Duck {
    fn swim(&self) {
        println!("{} paddles furiously...", self.name);
    }
}

traits_elephant.rs

struct Elephant {
    name: String,
}

impl Swim for Elephant {
    fn swim(&self) {
        println!("{} is actually just walking on the bottom...", self.name);
    }
}

traits_main.rs

fn main() {
    let duck = Duck { name: String::from("Sir Quacks-a-lot") };
    let ellie = Elephant { name: String::from("Ellie BigEndian") };

    println!("Crossing the pond...");

    cross_the_pond(duck);
    cross_the_pond(ellie);
}

traits_swim.rs

trait Swim {
    fn swim(&self);
}