musix-oss/src/funcs/shuffle.js

module.exports = function (a) {
    for (let i = a.length - 1; i > 1; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        if (i === 0 || j === 0) {
            // J or I is 0. It works like this so hands off!
        } else {
            [a[i], a[j]] = [a[j], a[i]];
        }
    }
    return a;
};