Rust: Enums

Status: Courses

1. Typically used to model things that can be of different kinds.

   #![allow(unused)]
   fn main() {
   // Simple Enum 
   enum Direction {
   	N, // These are called as variants 
   	E, // Variants are all posiblities of a Type.
   	S,
   	W
   }
   }

2. Variants can be defined with or without data. Data can be any type in Rust, see example below

   // Simple Enum 
   enum Direction {
   	N, // These are called as variants 
   	E, // Variants are all posiblities of a Type.
   	S,
   	W
   }
   // Enum with Data 
   enum PlayerAction {
   	// Variant with 2 data
   	Move {
   		direction: Direction,
   		speed: u8
   	},
   	// Variant without data 
   	Wait, 
   	// Variant with direction
   	Attack(Direction)
   }
   
   fn main() {
   	// Init the player action 
   	let player1_action = PlayerAction::Move {
   		direction: Direction::N,
   		speed: 189
   	}
   	// match 
   	match player1_action {
   		// Deconstruct direction and speed in this branch
   		PlayerAction::Move { direction, speed } => {
   		  println!("Player moved {:?} with speed {}.", direction, speed);
   		}, 
   		PlayerAction::Attack(direction) => {
   		  println!("Player Attacked {:?}", direction);
   		}, 
   		PlayerAction::Wait => println!("Player Waits"); 
   	}
   }