null

The null keyword is the null reference literal. It represents the absence of a value for reference/nullable types and can be matched explicitly in a match.

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Syntax & Example

let name: string? = null;

match name {
    null => print("no name"),
    n => print(n),
}

type Json = string | i64 | f64 | bool | null;

fn print_json(v: Json) {
    match v {
        null => print("null"),
        s: string => print(s),
        _ => print("other"),
    }
}

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Use Cases

• Representing the absence of a value for nullable types.
• Distinguishing "no value" from a present value in match arms.
• Initializing optional references before they are assigned.