JS.Class - Ruby-style JavaScript

JS.Class is a library designed to facilitate object-oriented development in JavaScript. It implements Ruby’s core object, module and class system and some of its metaprogramming facilities, giving you a powerful base to build well-structured OO programs.

    var Event = new JS.Class({
        include: JS.Observable,

        fire: function(data) {
            this.notifyObservers('fire', data);
        }
    });

Features

JS.Class is designed to make JavaScript behave like Ruby in terms of its OOP structures. To this end, it provides the following features:

Classes and modules with Ruby-compatible inheritance
Subclassing and mixins
Late-binding arguments-optional super calls to parent classes and mixins
Singleton methods and eigenclasses
included, extended and inherited hooks
Method binding
Ports of various standard Ruby modules, including Enumerable, Hash, Set, Observable, Comparable, Forwardable

Its inheritance system supports late-bound super() calls to parent classes and modules, including calls from singleton methods. It has been designed to mimick Ruby as closely as possible, so if you know Ruby you should feel right at home.

Download version 2.1

Version 2.1 builds on the 2.0 core and libraries and adds several new core features and packages. A quick tour of the new features:

New libraries: ConstantScope, Hash and HashSet, a much faster Set implementation.
The package manager has been improved with a new API, parallel downloading of files, and support for server-side environments such as SpiderMonkey, Rhino and V8. It also supports user-defined loader functions for transparent integration with Google and Yahoo!’s packaging systems.
The Enumerable module has been updated with plenty of methods from Ruby 1.9, and now supports enumerators, and Symbol#to_proc-like functionality whereby a string, MethodChain or any object that implements toFunction() can be used as an iterator.
The core object methods now live in Kernel, and we’ve added new methods: tap(), equals(), hash() and enumFor().
The double inclusion problem is now fixed; no current Ruby implementation seems to support this properly.
Ancestor and method lookups are now cached so callSuper runs about twice as fast.
Classes can be named to generate displayName on methods for use with the WebKit debugger.

Download JS.Class 2.1.0

Most code based on version 1.x will be compatible with this release, but there a few issues to be aware of. If you have code you cannot update to 2.x at present, 1.6 is still available:

Download JS.Class 1.6.3

Acknowledgements

JS.Class was initially inspired by, and borrows ideas from, these open-source projects:

The standard library has been influenced by techniques demonstrated in Pro JavaScript Design Patterns, and contains ports of a few standard Ruby modules.

JS.Class Ruby-style JavaScript

Features

Download version 2.1

Acknowledgements

Core reference

Standard library