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Ruby MRI

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Title: Ruby MRI  
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Subject: Ruby (programming language), Ruby Document format, Ruby Central, XRuby, Mruby
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Ruby MRI

Developer(s) Yukihiro Matsumoto (among others)
Stable release 2.2.3 / August 18, 2015 (2015-08-18)[1]
Written in C
Operating system Cross-platform
Type Ruby programming language interpreter
License Ruby License
Simplified BSD License
GNU General Public License (prior to 1.9.3)
Yukihiro Matsumoto, the creator of Ruby.

Matz's Ruby Interpreter or Ruby MRI (also called CRuby) is the reference implementation of the Ruby programming language named after Ruby creator Yukihiro Matsumoto ("Matz"). Until the specification of the Ruby language in 2011, the MRI implementation was considered the de facto reference. The RubySpec project has created a large test suite that captures 1.8.6/1.8.7/1.9 behavior as a reference conformance tool. Ruby MRI 1.9.2 currently passes over 99% of RubySpec.[2]

The latest stable version is Ruby 2.2.3.[1]


Yukihiro Matsumoto ("Matz") started working on Ruby on February 24, 1993, and released it to the public in 1995. "Ruby" was named as a gemstone because of a joke within Matsumoto's circle of friends alluding to the name of the Perl programming language.[3]

The 1.8 branch has been maintained until June 2013,[4] and 1.8.7 releases have been released since April 2008.[5][6] This version provides bug fixes, but also many Ruby feature enhancements.

Licensing terms

Prior to release 1.9.3, the Ruby interpreter and libraries were distributed as dual-licensed free and open source software, under the GNU General Public License or the Ruby License.[7] In release 1.9.3, Ruby's License has been changed from a dual license with GPLv2 to a dual license with the 2-clause BSD license.[8]

Operating systems

Ruby MRI is available for the following operating systems (supported Ruby versions can be different):

This list may not be exhaustive.


Commonly noted limitations include:

Backward compatibility
Version 1.9 and 1.8 have slight semantic differences.[9] The release of Ruby 2.0 sought to avoid such a conflict between different versions.[10]

See also


  1. ^ a b
  2. ^
  3. ^
  4. ^
  5. ^
  6. ^
  7. ^
  8. ^
  9. ^
  10. ^

External links

  • Ruby language home page
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