FizzBuzz

A classic FizzBuzz implementation showing recursive functions and if as an expression.

fn fizzbuzz(
    n: Int,
): String {
    let fizz = n % 3 == 0
    let buzz = n % 5 == 0
    if fizz && buzz {
        "FizzBuzz"
    } else if fizz {
        "Fizz"
    } else if buzz {
        "Buzz"
    } else {
        "${n}"
    }
}

fn run(
    n: Int,
    limit: Int,
): Void {
    if n <= limit {
        debug fizzbuzz(n)
        run(n + 1, limit)
    }
}

run(1, 20)

Key concepts demonstrated:

• if as an expression that produces a value
• String interpolation with ${}
• Recursive functions
• Void-returning functions that use if for control flow