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  1. class A
  2.   def x
  3.     $COUNTER += 1
  4.     1
  5.   end
  6. end
  7.  
  8. class B
  9.   def x
  10.     $COUNTER += 1
  11.     3
  12.   end
  13. end
  14.  
  15. class C
  16.   def x
  17.     $COUNTER += 1
  18.     2
  19.   end
  20. end
  21.  
  22.  
  23. def f o
  24.   o.x
  25. end
  26. $COUNTER = 0
  27. p [A.new, B.new, C.new].sort_by &method(:f)
  28. p $COUNTER
  29.  
  30. def g a, b
  31.   a.x <=> b.x
  32. end
  33. $COUNTER = 0
  34. p [A.new, B.new, C.new].sort &method(:g)
  35. p $COUNTER
Success #stdin #stdout 0.02s 28208KB
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stdout
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[#<A:0x002ac4699b8018>, #<C:0x002ac4699b7f78>, #<B:0x002ac4699b7fa0>]
3
[#<A:0x002ac4699b7a50>, #<C:0x002ac4699b7a00>, #<B:0x002ac4699b7a28>]
4
https://ideone.com/I2qVgn
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
public

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