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  1. # Swift's closure
  2. #   https://d...content-available-to-author-only...e.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Closures.html
  3.  
  4.  
  5. class String
  6.     def self.unfoldl(b, &block)
  7.         unless (pair = yield b).nil?
  8.             a, b1 = pair
  9.  
  10.             self.unfoldl(b1, &block) + a
  11.         else
  12.             ''
  13.         end
  14.     end
  15. end
  16.  
  17.  
  18. DigitNames = {
  19.     0 => "Zero", 1 => "One", 2 => "Two",   3 => "Three", 4 => "Four",
  20.     5 => "Five", 6 => "Six", 7 => "Seven", 8 => "Eight", 9 => "Nine"
  21. }
  22. Numbers = [16, 58, 510]
  23.  
  24.  
  25. strings = Numbers.map { |number|
  26.     String.unfoldl(number) { |num|
  27.         if num <= 0
  28.             nil
  29.         else
  30.             [DigitNames[num % 10], num / 10]
  31.         end
  32.     }
  33. }
  34.  
  35.  
  36. for s in strings
  37.     puts s
  38. end
Success #stdin #stdout 0.01s 7412KB
comments (?)
stdin 
Standard input is empty
stdout 
OneSix
FiveEight
FiveOneZero
https://ideone.com/4OzC0s
language:
Ruby (ruby 2.5.5)
created:
9 years ago
visibility:
public

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