Inheriting From the event emitter - Part 3

The code

'use strict';

var Greetr = require('./greetr');

var greeter1 = new Greetr();

greeter1.on('greet', function(data) {
    console.log('Someone greeted!: ' + data);
});

greeter1.greet('Tony');

• Use class for inheritance

'use strict';

var EventEmitter = require('events');

module.exports = class Greetr extends EventEmitter {
    constructor() {
        super();
        this.greeting = 'Hello world!';
    }

    greet(data) {
        console.log(`${ this.greeting }: ${ data }`);
        this.emit('greet', data);
    }
}