How to handle event emitters in Node.JS and a common prototype pattern for it.

eventproto.js

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

function EventProto() {
    if (!(this instanceof EventProto)) {
        console.log('Not an instance; returning new.');
        return new EventProto();
    }
    EventEmitter.call(this);
    var _self = this;
}
EventProto.prototype = Object.create(EventEmitter.prototype);

EventProto.prototype.SayHello = function() {
  this.emit('SayHello','Hello');
};


var e = new EventProto();
e.on('SayHello', function(evt) {
    console.log(evt);
});

e.SayHello();