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Singleton Methods

Singleton methods are per-object methods

class Dog
  def talk
    puts "Woof"
  end
end

fido  = Dog.new
rover = Dog.new

def fido.wag
 puts "I'm Happy!"
end

fido.talk   # => Woof
rover.talk  # => Woof

fido.wag    # => I'm Happy!
rover.wag   # => NoMethodError Exception

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