node.js Events

  Please read how to initialize npm from this post.

The reference is 'https://nodejs.org/dist/latest-v14.x/docs/api/events.html'.

1. require

const EventEmitter = require('events');

const uuid = require('uuid');

'uuid' will create random string

2. Create class

const EventEmitter = require('events');

const uuid = require('uuid');

class Event_log extends EventEmitter{

log(message) {

this.emit('message', {id : uuid.v4(), msgmessage);

}

}

module.exports = Event_log;

3. Create rest

const logger = new Event_log();

logger.on('message', (data) => console.log('Called Listener : ', data));

logger.log('Hello World');

4. run from terminal

You could use for code logger like console.log

Whole code

const EventEmitter = require('events'); // require to create EventEmitter

const uuid = require('uuid'); // create random string

class Event_log extends EventEmitter{

log(message) {

this.emit('message', {id : uuid.v4(), message});

}

}

const logger = new Event_log();

logger.on('message', (data) => console.log('Called Listener : ', data));

logger.log('Hello World');