How do I handle multiple listeners in Node.js?

How do I handle multiple listeners in Node.js?

In Node.js, you can handle multiple listeners by using the EventEmitter class. You can add multiple listeners to an event using the 'on' method.

Can you give me an example of using EventEmitter?

Sure! Here's a simple example:

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

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

myEmitter.emit('event'); // This will trigger the listener and log the message.

What if I want to remove a listener?

You can remove a listener using the 'removeListener' method. Here's how:

const callback = () => {
  console.log('This will not be logged.');
};

myEmitter.on('event', callback);
myEmitter.removeListener('event', callback);
myEmitter.emit('event'); // This will not trigger the callback.

Are there any limits to the number of listeners?

Yes, by default, Node.js warns you if you add more than 10 listeners for a single event. You can increase this limit using the 'setMaxListeners' method.