define class methods by using a class within a class's singleton class like the code : Singletons « Design Patterns « Ruby

1. Ruby
2. Design Patterns
3. Singletons

define class methods by using a class within a class's 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"

 

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