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  1. class Foo
  2.  
  3.     include Comparable
  4.  
  5. 	attr_reader :size, :color
  6.  
  7. 	@@size_order = {
  8. 		'small' => 1, 
  9. 		'medium' => 2, 
  10. 		'large' => 3, 
  11. 		'super-sized' => 4
  12. 	}
  13.  
  14. 	@@color_order = {
  15. 		'green' => 1,
  16. 		'blue' => 2,
  17. 		'red' => 3
  18. 	}
  19.  
  20. 	def initialize( x, y )
  21. 		@size = x
  22. 		@color = y
  23. 	end
  24.  
  25. 	def <=> ( o )
  26. 		if (@size == o.size)
  27. 			if (@color == o.color) 
  28. 				return 0
  29. 			else
  30. 				return (@@color_order[@color] > @@color_order[o.color]) ? 1 : -1
  31. 			end
  32. 		else
  33. 			return (@@size_order[@size] > @@size_order[o.size]) ? 1 : -1
  34. 		end
  35. 	end
  36.  
  37. end
  38.  
  39. a = Foo.new( 'small', 'blue' )
  40. b = Foo.new( 'small', 'green' )
  41. c = Foo.new( 'small', 'blue' )
  42. d = Foo.new( 'large', 'red' )
  43.  
  44.  
  45. puts a < b
  46. puts a > b
  47. puts a == b
  48. puts '----------'
  49. puts a > c
  50. puts a < c
  51. puts a == c
  52. puts '----------'
  53. puts a > d
  54. puts a < d
  55. puts a == d
  56.  
Success #stdin #stdout 0.02s 7460KB
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Standard input is empty
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false
true
false
----------
false
false
true
----------
false
true
false
https://ideone.com/PL37JP
language:
Ruby (ruby 2.5.5)
created:
11 years ago
visibility:
public

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