FizzBuzz

The classic fizzbuzz test

JavaScript

var fizzBuzz = function fizzBuzz() {
    var output = "";
    for (var i = 1; i <= 20; i++) {
        output += i.toString() + ": "
        if (i % 2 === 0) {
            output += "fizz";
        }
        if (i % 3 === 0) {
            output += "buzz";
        }
        output += " ";
    };
    document.write(output)
}();