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  1. #!/usr/bin/env ruby
  2.  
  3. class X
  4.   def initialize(var)
  5.     @attribute = var
  6.   end
  7.  
  8.   def attribute
  9.     @attribute
  10.   end
  11. end
  12.  
  13. x = [X.new(1), X.new(2), X.new(3)]
  14. y = [X.new(1), X.new(2), X.new(4)]
  15.  
  16. not_in_y = x.reject{ |x_item| y.index { |y_item| x_item.attribute == y_item.attribute } }
  17. not_in_x = y.reject{ |y_item| x.index { |x_item| x_item.attribute == y_item.attribute } }
  18.  
  19. p not_in_y
  20. p not_in_x
Success #stdin #stdout 0.01s 7460KB
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[#<X:0x9d74070 @attribute=3>]
[#<X:0x9d74020 @attribute=4>]
https://ideone.com/Eg2cav
language:
Ruby (ruby 2.5.5)
created:
11 years ago
visibility:
public

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