FizzBuzzWhizz.js

var _ = require('underscore');

var special_words = ["Fizz", "Buzz", "Whizz"];
var candidates = seq(9); // 1..9

// select 3 random numbers from candidates.
var special = _(3).times(function(i) {
    var selected = candidates[_.random(candidates.length-1)];
    candidates = _.without(candidates, selected);
    return selected;
});
console.log(special);

var input = seq(100); // 1..100

// main
var output = _.map(input, function yamete(n) {
    return rule1(n) || rule2(n) || rule3(n);
});

console.log(_.zip(input, output));

function rule1(n) {
    return new RegExp(special[0] + '').test(n + '') ? special_words[0]:false;
}

function rule2(n) {
    return _.reduce(special,  function(memo, s){
        this.i++;
        return memo + ((n%s) ? '' : special_words[this.i]);
    }, '', {i:-1});    
}

function rule3(n) { return n; }

function seq(n) { return _(n).times(function(n){return n+1}); }