Design Patterns Ruby

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  4. Define class methods by using a class within a classs singleton class like the code
class Area
  class << self
    def rect( length, width, units="inches" )
      area = length*width
      printf( "The area of this rectangle is %.2f %s.", area, units )
      sprintf( "%.2f", area )
    end
  end
end
Area.rect(10, 10) # The area of this rectangle is 100.00 inches.=> "100.00"