🚀 The JavaScript Event Loop

The JavaScript Event Loop is the core mechanism that allows a single-threaded language to perform non-blocking asynchronous operations. It enables your application to handle tasks like user input, network requests, and timers concurrently without freezing, ensuring a smooth and responsive user experience.

🌱 Level 1: The Big Picture (Basic) The Event Loop is JavaScript's secret to staying responsive, ensuring long tasks don't freeze the user interface by processing them in the background.

🎬 Level 2: The Core Mechanism (Intermediate) It works by continuously checking if the Call Stack is empty, and if it is, it moves a completed task from the Callback Queue onto the stack for execution. This video provides a visual deep dive into this process:

🧠 Level 3: The Full Picture (Advanced) Advanced understanding involves the Microtask Queue (for promises and async/await), which is always emptied with priority before the Event Loop processes the next task from the regular Macrotask Queue.