The JavaScript event loop

Otherwise, here’s a quick step-by-step explanation of how the JavaScript Event Loop works. 

• Push main() onto the call stack. 
• Push console.log onto the call stack. This then runs right away and gets popped. 
• Push Settimeout onto the stack. Settimeout is a Node API.
• After registering it in the APIs, setTimeout gets popped from the call stack. 
• Now the second setTimeout gets registered in the same way. We now have two Node APIs waiting to execute. 
• After waiting for 0 seconds, setTimeout gets moved to the callback queue, and the same thing happens with setTimeout . 
• Only one statement can execute at a time. This is taken care of by the event loop.