A breakdown of an elegant Fizzbuzz solution.

fizzbuzz.js

// Expanded version
for (var i = 1; i < 100; i++) {
  var f = i % 3 == 0, b = i % 5 == 0;
	if (f) {
      if (b) {
        console.log("Fizzbuzz")
      } else {
        console.log("Fizz");
      }
    } else if (b) {
      console.log("Buzz");
    } else {
      console.log(i);
    }
}

// Condensed solution
for (var i = 1; i < 100; i++) {
	var f = i % 3 == 0, b = i % 5 == 0;
  	console.log(f ? b ? "Fizzbuzz" : "Fizz" : b ? "Buzz" : i);
}