Solution with timers?

Question

JavaScript

Can you give me a solution with timers? Maybe I'm repeating myself deeply sorry for this. But in this case, you need a solution or, say, the implementation of the plan. The next task is to send a timer from the server that counts seconds and sends them to the socket to the client. Everything seems to be simple but. How to make a timer for each room in a socket? For example, there is a room in which there can be 4 people. If less than 3 people remain in this room, then the timer must be deleted.
As I wrote above, I asked this question here and the answers I answered there with a solution, it seems to be true logically, everything is like that . That's actually this question .
The thing is, as I wrote above, no more than 4 people can be in the room. If there are more then the server creates the next room. Example in room [1]=>4 people, 5th user came to the resource. The server will create a room [2] where 5 actually goes. The timer will need to be started when there are more than 3 people in room [2], and if there are less than three, then the timer must be deleted. How can this be implemented? I tried to send UNIX to the client on the client, but it turns out that the synchronization of which network response is long, for which the browser takes a long time to load. And it turns out for one the timer stopped ticking for someone. Why and how I think it is necessary to give a countdown from the server. The timer was created by an object and given away, but it is problematic to remove it. How can this be done?

Answer 1

Each time you connect a socket, create a timer and throw it off only to the socket, and not to everyone, it’s not io.emit, but socket.emit (on the server).