Скачать или смотреть JavaScript Event Loop Explained (Call Stack, Microtasks & Queues)

JavaScript is called single-threaded, yet it handles timers, promises, and user interactions without blocking.
So how does one thread do so much work?

In this video, we visually break down how the JavaScript Event Loop works—step by step.

You’ll see exactly how the Call Stack, Web APIs, Microtask Queue, and Macrotask Queue interact to make asynchronous JavaScript possible.

We’ll walk through a real code example and predict the execution order so you finally understand why promises run before setTimeout, even with a delay of zero.

In this video, you’ll learn:

How the Call Stack executes JavaScript (LIFO)

What the browser’s Web APIs actually do

Why the Microtask Queue has higher priority

How the Event Loop decides what runs next

The exact execution order of Promises vs setTimeout

If async JavaScript has ever felt confusing, this visualization will make it click.

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#EventLoop
#AsyncJavaScript
#JavaScriptInternals
#FrontendDevelopment