singleton class

test.rb

# Class
class Vehicule
  def move
    'I move'
  end
end

# Singleton Class
class << Vehicule
  def available_colors
   %w(red green blue)
  end
end

class Car < Vehicule
  def move
    'I drive'
  end
end

class << Car
  def available_colors
    super + %w(black)
  end
end


something_that_moves = Car.new
puts something_that_moves.move


def something_that_moves.clignote
  'blibngbling'
end

class << something_that_moves
  def super_clignote
    'blibngbling'
  end
end

class << something_that_moves.singleton_class
  def super_super_clignote
    'blibngbling'
  end
end

puts something_that_moves.clignote
puts something_that_moves.super_clignote

puts Car.available_colors.to_s

puts "something_that_moves.class.ancestors: #{something_that_moves.class.ancestors}"
puts "Car.ancestors: #{Car.ancestors}"
puts "Car.singleton_class.ancestors: #{Car.singleton_class.ancestors}"

puts "Car.singleton_class.object_id: #{Car.singleton_class.object_id}"