Design Twitter LeetCode solution in JavaScript

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var Twitter = function () {
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  this.users = new Map();
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  this.tweets = [];
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};
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Twitter.prototype.postTweet = function (userId, tweetId) {
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  if (!this.users.has(userId)) this.users.set(userId, new Set());
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  this.tweets.push({ userId, tweetId });
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};
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Twitter.prototype.getNewsFeed = function (userId) {
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  let user = this.users.get(userId);
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  let recentTweets = [];
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  for (
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    let i = this.tweets.length - 1;
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    i >= 0 && recentTweets.length < 10;
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    i--
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  ) {
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    if (user.has(this.tweets[i].userId) || this.tweets[i].userId === userId) {
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      recentTweets.push(this.tweets[i].tweetId);
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    }
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  }
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  return recentTweets;
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};
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Twitter.prototype.follow = function (followerId, followeeId) {
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  let user = this.users.get(followerId) || new Set();
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  user.add(followeeId);
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  this.users.set(followerId, user);
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};
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Twitter.prototype.unfollow = function (followerId, followeeId) {
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  this.users.get(followerId)?.delete(followeeId);
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};