gistfile1.rb

module A
  def hi(*list)
    singleton = class << self; self; end
    list.each do |l|
      singleton.send(:define_method, l) do
        puts l
      end
    end
  end
end
 
class B
  extend A
end
 
B.hi(:sam, :toddy)
B.sam # => prints "sam"
B.new.sam # => fails