which_ruby is a simple helper for checking running Ruby engines.

include WhichRuby in irb:

rvm use jruby
gem install which_ruby
irb
 > require 'which_ruby'
=> true 
 > include WhichRuby
=> Object

access the API:

 > ruby_type
=> :jruby
 > rt
=> :jruby
 > is_ruby_type? :jruby
=> true 
 > r? :jruby
=> true 
 > jruby?
=> true

define execution scopes:

 > ruby_scope(:jruby){"foo"}
=> "foo"
 > ruby_scope(:rbx){"foo"}
=> nil

Run the examples with different runtimes, jruby for example:

rvm use jruby
ruby examples/ex.rb

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