Hands-On Node Event Emitter Exercise 1

eventemitter.js

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

// Here is the Ticker constructor
var Ticker = function() { // This is a pseudo-class
}

util.inherits(Ticker, EventEmitter);

// Emit tick on the tick event
Ticker.prototype.tick = function() {
	this.emit('tick event', 'tick');
}

var ticker = new Ticker();

ticker.on('tick event', function () {
    console.log('Caught tick event.');
});

setInterval(function () {
    ticker.tick();
}, 1000);