Mustang development is proudly sponsored by Cubox, Agile Rails Devshop

Mustang - V8 engine in Ruby's body

Mustang is ruby proxy library for awesome Google V8 JavaScript engine.


Before you install mustang gem make sure you have scons installed.

$ sudo apt-get install scons # on debian
$ sudo pacman -S scons       # on archlinux
$ brew install scons         # on mac...

Using rubygems:

$ gem install mustang


$ git clone git://
$ cd mustang
$ rake compile
$ rake install


For now it's only proof of concept. It implements very simple evaluation of javascript code:

require 'mustang'

cxt =
cxt.eval("'Hello' + ' World!';") # => 'Hello World!'
cxt.eval("var a=1;")
cxt.eval("a+5;") # => 6

cxt[:puts] = method(:puts)
cxt.eval("puts(a)") # displays "1" on the screen
cxt[:a] # => 1

Note on Patches/Pull Requests

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.

Copyright (c) 2010 Kriss 'nu7hatch' Kowalik. See LICENSE for details.