Asynchronous JavaScript & EVENT LOOP from scratch
MindCraft Frontend Web Dev - JS Essential Lecture 16
Course by: MindCraft

In this lecture, we dive deep into understanding asynchronous JavaScript and the Event Loop, crucial concepts for developing modern web applications. We explore how JavaScript executes code asynchronously in the web browser, covering topics such as the Call Stack, Web APIs, MicroTask Callback Queue, and the Event Loop.

Topics Covered:

• 00:00 - Introduction

• 00:40 - How JS Engine Executes the Code using Call Stack

• 03:25 - Main Job of the Call Stack

• 03:51 - How JavaScript Performs Async Tasks

• 04:36 - Behind the Scenes in the Browser

• 07:35 - Web APIs in JavaScript

• 12:03 - How setTimeout Works Behind the Scenes in Browsers

• 16:09 - Event Loop & Callback Queue in JavaScript

• 18:59 - How Event Listeners Work in JavaScript

• 23:43 - More About Event Loop

• 25:02 - Why Do We Need Event Loop?

• 27:29 - How fetch() Function Works

• 30:26 - MicroTask Queue in JavaScript

• 36:01 - What Are MicroTasks in JavaScript?

• 38:35 - Starvation of Functions in Callback Queue

• 39:48 - Teaser for the Next Video

• 40:53 - Thank You for Watching Namaste JavaScript

This video provides a comprehensive understanding of how JavaScript handles asynchronous operations using the Event Loop mechanism. It covers practical examples and insights into how various JavaScript features like setTimeout, event listeners, and fetch interact with the browser environment to achieve non-blocking behavior.