Concept of Memoization.

Answer: Memoization is an optimization technique used to speed up function execution by storing the results of expensive function calls and returning the cached result when the same inputs occur again.

const memoize = (fn) => {
  const cache = {};
  return (...args) => {
    const key = JSON.stringify(args);
    if (cache[key]) {
      return cache[key];
    }
    const result = fn(...args);
    cache[key] = result;
    return result;
  };
};