enum

The enum keyword declares an enumeration: a type whose values are a fixed set of named variants. Enums may carry associated data in their variants and are commonly combined with match.

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Syntax & Example

enum Color {
    Red,
    Green,
    Blue,
}

let c = Color::Red;
match c {
    Color::Red => print("red"),
    Color::Green => print("green"),
    Color::Blue => print("blue"),
}

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Use Cases

• Modeling a closed set of alternatives (states, options, statuses).
• Tagged-union variants that carry payload data.
• Combining with match for exhaustive, compiler-checked branching.

See also: Enums & Pattern Matching.