What is the event loop?
The event loop is a core part of Node.js's asynchronous execution model. JavaScript code primarily runs on the main thread, while asynchronous operations can be handled by the operating system or libuv. When operations complete, their callbacks or promise continuations are scheduled so JavaScript can process them without blocking on the I/O operation itself.
Key Takeaways
- The event loop enables asynchronous execution.
- JavaScript execution primarily occurs on the main thread.
- Blocking the event loop can reduce application responsiveness.
Knowledge Check
What is the primary role of the Node.js event loop?