Pattern match + pipe

Exhaustiveness-checked match with ranges and guards, plus the pipe operator for left-to-right data flow.

# Exhaustiveness-checked match and the pipe operator.
fn describe(value: int) -> str:
    match value:
        0 => "zero"
        1..10 => "small"
        n if n > 100 => "large: {n}"
        _ => "other"

fn main():
    let result = [3, 50, 200, 0] |> map(describe)
    print(result)

Open in the playground (full editor) →

Walkthrough

match arms cover literals (0), ranges (1..10), guarded bindings (n if n > 100), and the wildcard _ — nine pattern forms in total.
Exhaustiveness is checked at compile time: delete the _ arm and lux check reports the gap, with the location.
The pipe operator |> reads left-to-right: the list flows into map(describe).