Discussion on: Understanding the Event Loop, Synchronous vs Asynchronous Code (Explained for Beginners)

[Kai Alder]

For the challenge: A, D, C, B — same pattern as the main puzzle. Sync first, then microtasks, then macrotasks.

Nice breakdown btw. The office worker analogy is solid for beginners. One thing that tripped me up early on was async/await — it looks synchronous but the stuff after await actually goes into the microtask queue too. That blew my mind when I first figured it out debugging a race condition.

Here's a fun follow-up puzzle if you want to make people's heads spin:

setTimeout(() => console.log("1"), 0);
Promise.resolve().then(() => {
  console.log("2");
  setTimeout(() => console.log("3"), 0);
});
Promise.resolve().then(() => console.log("4"));

Nesting microtasks and macrotasks is where it gets really interesting.

[Ebenezer]

Hey Alder! First of all, thanks a lot for reading the post and taking the time to comment.
You’re absolutely right about the challenge — A, D, C, B is the correct order. Sync code runs first, then microtasks, and finally macrotasks. I'm really glad the explanation made sense.
And I appreciate the kind words about the office worker analogy. When I was first learning the event loop, it felt pretty abstract, so simple mental models helped me a lot too.
Your point about async/await is a really good one. At first glance it looks like normal synchronous code, but under the hood the code after await actually continues in the microtask queue, just like a Promise .then(). That realization definitely feels like a “wait… what?” moment when you first see it while debugging something.
Also thanks for sharing the follow-up puzzle idea — I guess the output is 2 4 1 3