🧵 JavaScript Interview Prep: Single-Threaded or Multi-Threaded? Event Loop? Async Tasks?
If you’re preparing for a JavaScript interview , chances are you’ll come across questions like: Is JavaScript single-threaded or multi-threaded? How does JavaScript handle asynchronous tasks? What is the event loop, and how does it work? These are fundamental concepts that every JavaScript developer should understand — not only for interviews but also for writing efficient, non-blocking code. Let’s break them down clearly 👇 🧠 Question 1: Is JavaScript Single-Threaded or Multi-Threaded? The short answer is: 👉 JavaScript is single-threaded. That means it can execute only one task at a time on a single main thread . This single thread handles: Code execution Function calls Event handling DOM updates (in browsers) So, when you run JavaScript, it processes your code line by line , synchronously . If one piece of code takes too long to finish, the rest of the program must wait — this is called blocking . ⚙️ Question 2: How Does JavaScript Handle Asynchronous Task...