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If you’ve ever wondered why: then you aren’t alone. At first glance, JavaScript looks like it should run code top to bottom, one line at a time. And that’s mostly true — until asynchronous operations like timers, network requests, or promises enter the picture. Suddenly, execution order feels magical. But it’s not magic. It’s a well-orchestrated system involving the Global Execution Context, Call Stack, Web APIs, Queues, and the Event Loop.
Hey, if you’ve ever wondered what actually happens when your JavaScript code runs in the browser, you’re not alone. In this blog, we’ll take a peek under the hood to understand how JavaScript engines like V8 (used in Chrome) execute code and optimize performance. Before diving into it, let’s understand what a JavaScript Engine is. A JavaScript engine is a program that interprets and executes JavaScript code.
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