What is an event emitter in programming?

What is an event emitter in programming?

An event emitter is an object that allows you to emit events and listen for them, enabling asynchronous communication.

Can you give me an example of how to use an event emitter?

Sure! In Node.js, you can use the 'events' module. Here's a simple example:

const EventEmitter = require('events');
const myEmitter = new EventEmitter();

myEmitter.on('event', () => {
  console.log('An event occurred!');
});

myEmitter.emit('event');

What are some common use cases for event emitters?

Common use cases include handling user interactions, managing asynchronous operations, and implementing pub/sub patterns.

Are there any performance considerations when using event emitters?

Yes, excessive event listeners can lead to memory leaks. It's important to manage listeners properly, especially in long-running applications.