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Categories / Ruby / Design Patterns

 

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"