Basic Enum Definition

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Basic Enum Definition

Enums define types with fixed variants. Variants can be unit-like, tuple-like (with data), or struct-like. The 'match' expression exhaustively handles all enum variants. 'if let' provides a concise way to match single patterns.

snippet.rs
rust
enum Direction {
    North,
    South,
    East,
    West,
}
 
enum Status {
    Active(u32),
    Inactive,
    Suspended { reason: String },
}
 
fn main() {
    let heading = Direction::North;
    
    match heading {
        Direction::North => println!("Heading north"),
        Direction::South => println!("Heading south"),
        Direction::East => println!("Heading east"),
        Direction::West => println!("Heading west"),
    }
    
    let current = Status::Active(42);
    if let Status::Active(credits) = current {
        println!("Active with {} credits", credits);
    }
}

Breakdown

enum Direction { North, South, East, West }

Simple enum with unit variants

enum Status { Active(u32), Inactive, Suspended { reason: String } }

Enum with tuple and struct variants

Direction::North

Access variant using :: path separator

if let Status::Active(credits) = current

Pattern match single variant without exhaustiveness

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Basic Enum Definition

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