JavaScript: производительность и оптимизация

1function debounce(fn, ms) {
2  let timer;
3  return (...args) => {
4    clearTimeout(timer);
5    timer = setTimeout(() => fn(...args), ms);
6  };
7}

1function throttle(fn, ms) {
2  let last = 0;
3  return (...args) => {
4    const now = Date.now();
5    if (now - last >= ms) {
6      last = now;
7      fn(...args);
8    }
9  };
10}

1function memoize(fn) {
2  const cache = new Map();
3  return (...args) => {
4    const key = JSON.stringify(args);
5    if (!cache.has(key)) cache.set(key, fn(...args));
6    return cache.get(key);
7  };
8}