Events Demo node.js | Constructor function inheriting from EventEmitter to "produce" objects w/ events

log.js

module.exports = function(users) {

  users.on("userAdded", function( msg ) {
    console.log( new Date() )
    console.log( "DATA => " + msg )
    console.log( "LIST => " + users.listAll() )
  } )

}

main.js

var UserList = require('./UserList')

var users = new UserList()

require('./log.js')(users)

setTimeout( function(){
  users.addUser("juanma")
}, 2000)

setTimeout( function(){
  users.addUser("alejandro")
}, 3000)

setTimeout( function(){
  users.addUser("david")
}, 5000)

UserList.js

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

util.inherits(UserList, EventEmitter);

var users = [];

function UserList() {}

UserList.prototype.addUser = function(user) {
  users.push(user)
  this.emit("userAdded", user)
}

UserList.prototype.listAll = function() {
  return users;
}

module.exports = UserList