Example for proving that Sublime Text 2 is running through RVM ruby and not the system default ruby. Goes with: http://ruby.zigzo.com/2013/01/11/sublime-text-2-and-rvm/

factorial.rb

class Factorial
  attr_reader :computed
  
  def initialize(number)
    @computed = solve(number)
  end

  def solve(number)
    number > 1 ? number * solve(number-1) : 1
  end
end

puts "5! = #{Factorial.new(5).computed}"
puts "And your ruby version is #{RUBY_VERSION}"