Скачать или смотреть How JavaScript Runs 1000 Tasks on One Thread

JavaScript runs on one thread. Yet it handles thousands of async operations at once. Here's the invisible loop making it all work.

The event loop is the most misunderstood mechanism in JavaScript. This video gives you the mental model to predict async behavior — microtasks, task queues, rendering pipeline, and why setTimeout(fn, 0) doesn't mean "run now."

0:00 Intro
0:02 The Single Thread Problem
1:12 The Runtime Architecture
2:36 Microtasks: The VIP Queue
4:05 The Full Picture
5:57 Outro

What you'll understand after watching:
Why Promise.resolve().then(fn) always runs before setTimeout(fn, 0)
The difference between the task queue and microtask queue
How the browser's rendering pipeline fits into the loop
Why setTimeout delay is a minimum, not a guarantee
The exact execution order of mixed async code

References:
Philip Roberts: "What the heck is the event loop anyway?" (JSConf EU 2014)
Jake Archibald: "In The Loop" (JSConf Asia 2018)
HTML Living Standard: Event Loops (whatwg.org)

#JavaScript #EventLoop #WebDevelopment