fizzbuzz.js

function FizzBuzz() {
	this.TestCases = new Array();
	this.AddCase = function(Name, DivisibleBy) {
		this.TestCases.push(
				function (x) {
					return x % DivisibleBy === 0 ? Name : '';
				}
		);
	};
	this.Run = function(x) {
		for (var i = 0; i <= x; i++) {
			var Output = '';
			for (var Case = 0; Case < this.TestCases.length; Case++) {
				Output += this.TestCases[Case](i);
			}
			console.log(Output === '' ? i : Output);
		}
	};
}

var fb = new FizzBuzz();
fb.AddCase("Fizz", 3);
fb.AddCase("Buzz", 5);
fb.Run(15);