singleton_class.rb

# singleton_class.rb
# zastav [@samueltonini]

obj = Object.new

def obj.who_i_am?
  puts "I'm a singleton method"
end

singleton_class = class << obj
  
  def and_who_i_am?
    puts "I'm a singleton method defined in a singleton class or also called eigenclass"
  end
  
  def bye
    puts "bye dude!"
  end
  
  self # singleton class object
end

obj.who_i_am?     # I'm a singleton method
obj.and_who_i_am? # I'm a singleton method defined in a singleton class or also called eigenclass
obj.bye           # bye dude!

p singleton_class.instance_methods(false) # [:who_i_am?, :and_who_i_am?, :bye]