demos/Demo/Day1/4-customevent.js

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

var MyEventClass=function(initial_no){
	this.count=initial_no;

};

util.inherits(MyEventClass,EventEmitter);  

MyEventClass.prototype.increment=function(){
	var self=this;
	setInterval(function(){
		if(self.count%2==0) self.emit("even");
		self.count++;
		}, 300);
};

var access=new MyEventClass(10);

access.on("even", function(){
	util.puts("Number is even! :: "+this.count);
});
access.increment();