node js event emitter

The EventEmitter is a class that is defined and exposed by the events module in Node.js. It is a core feature of Node.js that allows multiple objects to listen to an event (a string) emitted by another object. The EventEmitter class provides several methods to manage the event listeners and to emit the events. Here's a brief explanation of each step:

1. Import the events module using the require function:

const EventEmitter = require('events');

1. Create a new instance of the EventEmitter class:

const myEmitter = new EventEmitter();

1. Register a listener for a specific event using the on method:

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

1. Emit the event using the emit method:

myEmitter.emit('event');

1. Optionally, you can pass arguments to the event listeners when emitting an event:

myEmitter.on('sum', (a, b) => {
  console.log(a + b);
});

myEmitter.emit('sum', 2, 3);

1. Remove a specific listener using the removeListener method:

const listener = () => {
  console.log('Listener to be removed');
};

myEmitter.on('removeListenerExample', listener);
myEmitter.removeListener('removeListenerExample', listener);

This summary outlines the basic steps for using the EventEmitter in Node.js, from importing the module to emitting and handling events.