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This is a preliminary release for internal team reviewing.
The URL and address discribed below are not available yet.
The official release will be announced later. Thanks.
Any suggestion of the modification are welcome,
but the response might be delayed. Sorry for that in advance.

What's mruby

mruby is the light-weight implementation of the Ruby language complied to the ISO standard to execute various environments. It can run in 'interpreter form' or 'compile and execute on vm form' according to its module construction.

This achievement is due to the Regional Innovation Creation R&D Programs of the Ministry of Economy, Trade and Industry of Japan.

Features of mruby

|  + Simple Syntax
|  + *Normal* Object-Oriented features(ex. class, method calls)
|  + *Advanced* Object-Oriented features(ex. Mix-in, Singleton-method)
|  + Operator Overloading
|  + Exception Handling
|  + Iterators and Closures
|  + Garbage Collection
|  + Dynamic Loading of Object files(on some architecture)
|  + Highly Portable (works on many Unix-like/POSIX compatible platforms
|    as well as Windows, Mac OS X, BeOS etc.)
|    cf.

How to get mruby

The mruby distribution files can be found in the following site:

The trunk of the mruby source tree can be checked out with the following command:

$ git ....

There are some other branches under development. Try the following command and see the list of branches:

$ git ....

mruby home-page

(sorry, it's not launched yet. we're working on this)

The URL of the mruby home-page is:

Mailing list

There is a mailing list to talk about mruby. To subscribe this list....[T.B.D.]

How to compile and install

See the file INSTALL.


See the file COPYING.

About Contribution

Thank you for considering of contribution for mruby. mruby has chosen a MIT License as comparatively loose condition, to expect to apply into various environment such as embedded system. However, the license requires to display copyright notice and license sentenses, for example manual or so. Especially for the recent bigger system, it is comlecated or very troublesome. So, mruby has decided to display "mruby developers" as copyright name to make it simple conventionally. In the future, mruby might ask you to distribute your new codes (that you will commit,) under MIT License as a member of "mruby developers" with keeping copyright of you. (We did not intend you to transfer or waive your copyright, Actual copyright holder name, you, will be listed in AUTHORS file.)

Please ask us if you want to distribute your code under other license or if your code is derived from GPL code.

The Author

See the file AUTHORS.

Feel free to send comments and bug reports to the author. Here is the author's latest mail address:

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