gistfile1.js

var compare = function (a, b) {
    var i = 0;

    for (; i < a.length; i++) {
        if (a[i] != b[i]) {
            return (a[i] > b[i]) ? 1 : -1;
        }
    }

    return 0;
};

return compare(a, b) * sortDir;