I threw together a quick, naive, FizzBuzz in it on their online demo, was surprised to find that it doesn't have a modulus operator. Can anyone come up with something simpler?

  let divisible = fn (x, y){
    return (x-(x/y*y))==0;
  };
  for let i=1;i<=30;i++ {
    if divisible(i,15){
      print("FizzBuzz");
    }else if divisible(i,3){
      print("Fizz");
    }else if divisible(i,5){
      print("Buzz");
    }else{
      print(i);
    }
  }

Edit: Correction, apparently it does have a modulo operator.