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⚠ The project is archived. No further development is planned.

Klassified Build Status

A simple object model for JavaScript.

Klassified provides a base class object that can be subclassed using its subclass class method, as in the following example:

var animal = object.subclass(function(that, my) {
    my.initialize = function(spec) {
        my.super(spec); =;
    that.getName = function() {

animal.class(function(that) {
    that.named = function(name) {
        return that({name: name});

var dog = animal.subclass(function(that, my) {
    that.getName = function() {
        return 'dog named' + that.super();

that represents the receiver (the instance or the class depending on the context).

Public and protected properties

Public methods are attached to the instance (that), while protected methods are attached to my.

Object creation

Instances can be created by calling a class function like the following:

var milou = dog({name: 'milou'});
milou.getName(); // => 'milou


The spec literal object is passed to my.initialize, which is called upon instance creation.

my.super should almost always be called from within initialize.

Super calls

Klassified has support for super calls using either that.super for public methods or my.super for protected methods.

Default methods in object

object provides the following instance methods and properties:

  • that.klass returns the class of the instance
  • my.subclassResponsibility method throwing an exception because a method should have been overridden.
  • my.initialize initialization method, takes a literal spec object.

object also provides the following class-side methods and properties:

  • object.subclasses returns an array of the direct subclasess of a class.
  • object.allSubclasses method that returns all the subclasess of a class.
  • object.subclass method used to create a new subclass of a class.

Abstract classes

Klassified supports abstract classes using abstractSubclass:

var animal = object.abstractSubclass(function(that, my) {

    // [...]


var dog = animal.subclass(function(that, my) {

    // [...]


animal(); // => Error: Cannot instantiate an abstract class
dog(); // => New dog instance

Singleton classes

Klassified support singleton classes using singletonSubclass:

var service = object.singletonSubclass(function(that, my) {

    // [...]


service.instance(); // Return the single instance of the class
service(); // => Error: Cannot create new instances of a singleton class, use `instance` instead.

Getters and setters generation

Klassified can generate getters and setters for protected properties on my, as below:

var animal = object.subclass(function(that, my) {
	my.initialize = function(spec) { =;


var a = animal();
a.getName(); // => 'milou'

Custom getters and setters are also supported:

var dog = animal.subclass(function(that, my) {
	my.get('name', function() {
        return 'A dog named ' +;
    my.set('name', function(value) { = value.toUpperCase();

var a = animal();
a.getName(); // => 'A dog named MILOU'