NodeJS advanced EventEmitter.

advanced-emitter.js

const EventEmitter = require('events').EventEmitter;
const util = require('util');

// constructor function
const Person = function(name) {
    this.name = name;
};

// let Person inherit all the EventEmitter features
util.inherits(Person, EventEmitter);

const ben = new Person("Ben");

// event listener
ben.on('speak', function(said) {
    console.log(`${this.name}, said: ${said}`);
});

// sample emit
ben.emit('speak', 'these are the sample phrases!!!!! ');