fizzbuzz

# FizzBuzz: match guards, string interpolation and a `for` over a range.
#
# Run: dawn run examples/basics/fizzbuzz.dawn

fn shout(n: Int) -> String =
  match n {
    x if x % 15 == 0 -> "FizzBuzz"
    x if x % 3 == 0 -> "Fizz"
    x if x % 5 == 0 -> "Buzz"
    x -> "${x}"
  }

pub fn main() -> Unit !io = {
  for i in 1..21 {
    println(shout(i))
  }
}

test "the divisible-by-fifteen arm has to come first" {
  assert shout(15) == "FizzBuzz"
  assert shout(9) == "Fizz"
  assert shout(10) == "Buzz"
  assert shout(7) == "7"
}