FizzBuzz solution with just one comparison:Bitwise operations, using predefined 0-15 numbers masksource: http://www.zoharbabin.com/which-fizzbuzz-solution-is-the-most-efficient

fuzzbuzz.js

// FizzBuzz solution with one comparison:
// Bitwise operations, using predefined 0-15 numbers mask

// live demo: http://jsfiddle.net/TbAuQ/
// source: http://www.zoharbabin.com/which-fizzbuzz-solution-is-the-most-efficient

var words = [undefined, "Fizz", "Buzz", "FizzBuzz"],
    mask = 810092048, //11 00 00 01 00 10 01 00 00 01 10 00 01 00 00
    c = 0;

for (var i = 1;i <= 100; i += 1) {
    c = mask & 3;
    
    console.log(
        i, 
        words[c] || i    
    );
    
    mask = mask >> 2 | c << 28;
}