example.js

var NotificationsService = function () {
  this.MAX_LEN = 10;
  this.notificationsArchive = new NotificationsArchive(); 
  this.notifications = [];
};

NotificationsService.prototype.push = function (notification) {
 var newLen, notificationToArchive;

 newLen = this.notifications.unshift(notification);

 if (newLen > this.MAX_LEN) {
   notificationToArchive = this.notifications.pop();
   this.notificationsArchive.archive(notificationToArchive);
 } 
};

NotificationsService.prototype.getCurrent = function () {
 return this.notifications;
};

var NotificationsService = function() {
  var MAX_LEN = 10;
  var notificationsArchive = new NotificationsArchive();
  var notifications = [];

  return {
    push: function(notification) {
      var newLen, notificationToArchive;

      newLen = notifications.unshift(notification);

      if (newLen > MAX_LEN) {
        notificationToArchive = notifications.pop();
        notificationsArchive.archive(notificationToArchive);
      }
    },

    getCurrent: function() {
      return notifications;
    }
  }
};