factorial.ab

#!/usr/bin/env amber
import * from "std/text"

/// Returns the factorial of the supplied number.
#[allow_generic_return]
fun factorial(nth: Num) {
    let fact = 1
    loop {
        if nth <= 1: break
        fact *= nth
        nth -= 1
    }
    return fact
}

/// Prints the factorial via both Amber and Bash.
main {
    let fact = factorial(5)
    echo "Factorial is {fact}"
    $ echo "Factorial is {fact}" $?
}