1function fibonacci(n) {2  if (n <= 1) return n;3  return fibonacci(n - 1) + fibonacci(n - 2);4}5 6function debounce(func, delay) {7  let timeoutId;8  return (...args) => {9    clearTimeout(timeoutId);10    timeoutId = setTimeout(() => func(...args), delay);11  };12}13 14const memoize = (fn) => {15  const cache = new Map();16  return (...args) => {17    const key = JSON.stringify(args);18    if (cache.has(key)) return cache.get(key);19    const result = fn(...args);20    cache.set(key, result);21    return result;22  };23};