function debounce(func, n) {
    let timer = null;

    return (...args) => {
        clearTimeout(timer);
        timer = setTimeout(func, n, ...args);
    };
}
function throttle(func, n) {
    let throttling = false;
    let last_args = null;
    let last_call = Date.now();
    let timeout = null;

    return (...args) => {
        if (!throttling) {
            last_call = Date.now();
            if (last_args) {
                func.apply(this, last_args);
                last_args = null;
            } else {
                func(...args);
            }

            throttling = true;
            if (timeout) {
                clearTimeout(timeout);
            }

            timeout = setTimeout(
                () => {
                    throttling = false;

                    if (last_args) {
                        func.apply(this, last_args);
                    }
                },
                n - (Date.now() - last_call),
            );
        } else {
            last_args = args;
        }
    };
}
module.exports = {
    debounce,
    throttle,
};