Advantages of Different Ruby Implementations

Some one asked me what where the advantages of JRuby lately. I had to think and that got me to this post.

JRuby
- Runs on Android
- Can be uses to pre-comple code to Java Byte code for speed and code obscurity. :thumbs up:
- Runs on a Java-Virtual-Machine server.
- Runs on any computer w/ Java (whether it has Xcode or not)

MacRuby
- Scottish.
- GUI apps that use native cocoa frame work.
- iPhone apps through Ruby Motion.

mRuby
This is 'embedded ruby' and it hasn't been released yet but from what I know:
- Very light, requires little memory and space to install.
- Gives you Ruby expressiveness where a program language like Lua could only go before.

IronRuby
Sadly semi-abandoned. This Ruby's goal was to compile on Microsoft's .Net framework.
- All those poor .Net developers doomed to MS's C++++ (C#) would be able to taste salvation in Ruby.

Rubinius
Ruby that is mostly written in Ruby. Apparently this is good for thread-safe running of multiple rubies in one machine, and will also run faster. Seems like a cool little project, that might bring huge benefits down the line, but still an experiment at the moment.

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