How to fix concurrent code execution?

Question

Node.js

There is such a code that is executed immediately after the player connects. Faced a problem that if players connect at the same time, the startGame function does not work. The statuses of both players do not have time to update. What to do?

if(p1.id == userid)
  p1.status = 'connected';
else
  p2.status = 'connected';
if(status == 'created' && p1.status == 'connected' && p2.status == 'connected')
  startGame();

Answer 1

It's hard to tell from the code you provided. Most likely, the problem is that you did not take asynchrony into account.
Great video on the topic: https://youtu.be/8cV4ZvHXQL4
And this is an article on how to use asynchrony in practice: https://medium.com/devschacht/ire-aderinokun-async...
Well, there is a CodeDojo channel on YouTube - Highly recommended for understanding the basics of JavaScript.

Answer 2

Subscribe (for example, using Promise) to change status, p1.status, p2.status.
On any of the above events, perform checks and run startGame.