constructor () {
        this.tweets = [];
        this.following = new Map();
    }
https://leetcode.com/problems/design-twitter/
Your Twitter object will be instantiated and called as such:
var obj = new Twitter()
obj.postTweet(userId,tweetId)
var param_2 = obj.getNewsFeed(userId)
obj.follow(followerId,followeeId)
obj.unfollow(followerId,followeeId)