gistfile1.rbx

#!/usr/bin/env ruby
 
module Example
  def self.hello(arg)
    puts "Hello, #{arg}! You are Object \#: #{arg.object_id}"
    arg = 'different'
    puts "Arg is now #{arg}; Object \#: #{arg.object_id}"
  end
  
  def self.not_local_hello
    puts "Hello, #{@arg}! You are Object \#: #{@arg.object_id}"
    @arg = 'different'
    puts "Arg is now #{@arg}; Object \#: #{@arg.object_id}"
  end
  
  def local_hello
    puts "Hello, #{@arg}! You are Object \#: #{@arg.object_id}"
    @arg = 'different'
    puts "Arg is now #{@arg}; Object \#: #{@arg.object_id}"
  end
end
 
@arg = "Joe"
puts "Joe is #{@arg}; Object \#: #{@arg.object_id}"
Example.hello(@arg)
puts "Joe is still #{@arg}; Object \#: #{@arg.object_id}"
Example.not_local_hello
include Example
local_hello
puts "Now Joe has become #{@arg}; Object \#: #{@arg.object_id}"