What is the JavaScript event loop and how does it work?

What is the JavaScript event loop and how does it work?

The JavaScript event loop is a mechanism that allows JavaScript to perform non-blocking operations by using a single thread. It manages the execution of code, collects and processes events, and executes queued sub-tasks.

Can you explain how it handles asynchronous operations?

Sure! When an asynchronous operation is initiated, like a network request, it runs in the background. Once it's complete, a callback function is added to the event queue, and the event loop will execute it when the call stack is empty.

What happens if there are multiple tasks in the queue?

The event loop processes tasks in a first-in, first-out (FIFO) order. It will execute each task one at a time, ensuring that the call stack is clear before moving on to the next task.

Are there any limitations to the event loop?

Yes, since JavaScript is single-threaded, long-running tasks can block the event loop, causing delays in executing other queued tasks. This is why it's important to keep tasks efficient.