Common Data Structures

Module 1.4 - Common Data Structures

Enumeration

Defining an Enum - The Rust Programming Language

Learn about Enum in the Rust programming language book

Bullet points of the enumeration

An enumeration, or enum, is a data type that allows a variable to take on one of several possible values (or states). Each of these possibilities is called a "variant." For example, in Rust, an enum can represent different states of a traffic light with variants such as Red, Yellow, and Green.

enum Direction {
    Up,
    Down,
    Left,
    Right,
}

fn which_way(go: Direction) -> &'static str {
    match go {
        Direction::Up => "up",
        Direction::Down => "down",
        Direction::Left => "left",
        Direction::Right => "right",
    }
}

Structure

struct ShippingBox {
    depth: i32,
    width: i32,
    height: i32,
}

fn main() {
    let my_box = ShippingBox {
        depth: 3,
        width: 2,
        height: 5,
    };

    let tall = my_box.height;
    println!("the box is {:?} units tall", tall);
}