gistfile1.rb

# Instead of monkeypatching globally methods
# it is possible to `refine` methods
# so you know where a method is coming from.
#
# Ref:
# - http://rkh.im/ruby-2.1
# - http://www.ruby-doc.org/core-2.1.1/doc/syntax/refinements_rdoc.html
#
# Note:
# - it was intruced in ruby 2.0 and became stable in ruby 2.1.
 
module FunnyNumbers
  refine Fixnum do
    def double_me
      self * 2
    end
  end
end
 
class Location
  using FunnyNumbers
 
  def calculate
    20.double_me + 1
  end
 
end
 
puts Location.new.calculate