gistfile1.txt

#!/usr/bin/env ruby

class Foo
  def self.facing(arg)
    puts "in facing with arg #{arg}"
  end

  {:front => 'A', :back => 'AB', :left => 'AA', :right => 'AC'}.each_pair do |side, letters|
    instance_eval %{ def self.#{side}_facing; facing '#{letters}'; end }
  end
end

p Foo.singleton_methods.sort
p Foo.front_facing