How does Node.js's event loop mechanism, which directly impacts its performance, work? How does this system, often referred to as single-threaded, prevent I/O blocking? What are the advantages of this system and its use cases? I'd be happy to explain.
What is an event loop? What does it do?
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Event loop is like the heart of Node.js in my opinion, bro. How does it manage to handle dozens of connections simultaneously in a single-threaded system? No problem, it's all good. The event loop kicks in during I/O operations (like reading files, network requests, etc.): it doesn't block, it sets the operation aside and moves on to others. I didn't really get it until I ran 10,000 concurrent clients in my own project—those guys are pretty smart.
The advantages are a bonus: writing simple APIs, coding comfortably with async/await instead of struggling with callbacks. Use cases are clear too: APIs, real-time systems (WebSockets), database operations, etc. When I built a small chat app, the event loop freed me from waiting and gave me a serious performance boost, I tell you.