Fetch API & cancel duplicate API & cache API

Fetch API & cancel duplicate API & cache API

const usersCache = new Map<string, User>();

const getUserById = async (userId: string): Promise<User> => {
  if (!usersCache.has(userId)) {
    const user = await request.get(`https://users-service/${userId}`);
    usersCache.set(userId, user);
  }

  return usersCache.get(userId);
};

refs

https://www.jonmellman.com/posts/promise-memoization

https://mp.weixin.qq.com/s/U-K7GqdyMmSG0OZ1Mr64Wg

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