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JRuby
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Description
JRuby is a 100% Java implementation of the Ruby programming language. It is Ruby for the JVM.
JRuby provides a complete set of core "builtin" classes and syntax for the Ruby language, as well as most of the Ruby Standard Libraries. The standard libraries are mostly Ruby's own complement of .rb files, but a few that depend on C language-based extensions have been reimplemented. Some are still missing, but we hope to implement as many as is feasible.
See Differences Between MRI And JRuby for more information on potential incompatibilities between JRuby and the C implementation of Ruby.