var timeout = -1;
    var started = -7500;

    var update_timeout = () => (Date.now() - started > (UPDATE_INTERVAL / 2 + 5000) / 2) ? (clearTimeout(timeout), update(), started = Date.now(), timeout = setTimeout(update_timeout, UPDATE_INTERVAL)) : null;

    window.onfocus = () => (Date.now() - updated > (UPDATE_INTERVAL / 2 + 10000) / 2) ? update_timeout() : null;

    update_timeout();

var modularize = (array) => {
    return new Proxy(array, {
        get: (d, p) => {
            if (Number.isInteger(Number(p)))
                return d[((p % d.length) + d.length) % d.length];
        }
    });
};