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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. def unfoldl_string(b, f):
  6.     pair = f(b)
  7.  
  8.     if pair is None:
  9.         return ""
  10.     else:
  11.         a, b1 = pair
  12.  
  13.         return unfoldl_string(b1, f) + a
  14.  
  15.  
  16. digitNames = {
  17.     0: "Zero", 1: "One", 2: "Two",   3: "Three", 4: "Four",
  18.     5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine"
  19. }
  20. numbers = [16, 58, 510]
  21.  
  22.  
  23. def number_to_string(number):
  24.     return unfoldl_string(
  25.         number,
  26.         lambda num:
  27.                 None
  28.             if num <= 0 else
  29.                 (digitNames[num % 10], num / 10)
  30.     )
  31. strings = [number_to_string(number) for number in numbers]
  32.  
  33.  
  34. for s in strings:
  35.     print(s)
Success #stdin #stdout 0.01s 7896KB
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OneSix
FiveEight
FiveOneZero
https://ideone.com/8TouzI
language:
Python (cpython 2.7.16)
created:
9 years ago
visibility:
public

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