协助我解决这个难题

Question

我偶然发现了这个谜语，我不明白。无聊？想帮我吗？ 在这里：

var alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"

],

    secret = [8, 13, 8, 12, 4, 6, 15, 0, 2],
    secretSeed = null,
    randomSurprise = null;

//populate secret
secret = secret.map(function (x) { return alphabet(x); });

function recursiveRiddle(array, index) {
    if (array[index]) {
        var element = recursiveRiddle(array, index + 1);
        console.log(element);
    }
    return array[index + 1];
}
console.log('This one is tricky !!!');
randomSurprise = ~~(Math.random() * 100);
if (secret[secret.length] !== null && randomSurprise > 50) {
    secretSeed = ~(~1e6 % 333 << 4) % 4;
} else {
    secretSeed = typeof (secret && secret.length) === typeof (secretSeed) ?
}
recursiveRiddle(secret, secretSeed);

页面要我写更多，因为它主要是代码，所以我要写更多。