Class Ruby

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  4. Class methods give you the mechanism to properly implement the object counter
class Square
  def initialize
    if defined?(@@number_of_squares)
      @@number_of_squares += 1
    else
      @@number_of_squares = 1
    end
  end
  def Square.count
    @@number_of_squares
  end
end
a = Square.new
puts Square.count
b = Square.new
puts Square.count
c = Square.new
puts Square.count