What is the event loop in Node.js?

What is the event loop in Node.js?

The event loop is a core concept in Node.js that allows it to perform non-blocking I/O operations. It enables asynchronous programming by managing the execution of multiple operations without waiting for each to complete before moving on.

How does the event loop handle asynchronous operations?

The event loop uses a callback queue and a call stack. When an asynchronous operation completes, its callback is pushed to the queue, and the event loop processes it when the call stack is empty.

Can you explain the difference between the call stack and the callback queue?

Sure! The call stack is where function execution happens, while the callback queue holds messages or callbacks that are ready to be executed once the call stack is clear.

What happens if there are too many callbacks in the queue?

If there are too many callbacks, it can lead to performance issues, as the event loop may take longer to process them, potentially causing delays in handling new events.