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Whale function comparisson

a guest Jan 16th, 2018 106 Never
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  1. # The "always return space" function:
  2. s = ->(c) { ' ' }
  3.  
  4.  
  5. # The "most common distance" function:
  6.  
  7. ## Count the successor of each character in the input:
  8. stats = Hash.new { |h,k| h[k] = Hash.new { 0 } }
  9. File.read('whale.txt')
  10.   .chars
  11.   .each_cons(2) { |a,b| stats[a][b] += 1 }
  12.  
  13. ## Find `d`, the most common distance between each pair of characters:
  14. d = (0..255).max_by { |i| stats.sum { |k,v| v[((k.ord+i)%256).chr] } } # => 244
  15.  
  16. ## Create a function that returns the character `d` away from the given character c
  17. f = ->(c) {((c.ord+d)%256).chr}
  18.  
  19.  
  20. # Compare the functions
  21.  
  22. INPUT = File.read('whale2.txt')
  23.  
  24. def score_function(f)
  25.   INPUT
  26.     .each_char
  27.     .each_cons(2)
  28.     .count { |a,b| f[a] != b}
  29. end
  30.  
  31. puts "space score: #{score_function(s)}"
  32. puts "distance score: #{score_function(f)}"
  33.  
  34. # Output:
  35. # -----------------------
  36. # space score: 1005113
  37. # distance score: 1160559
  38. # -----------------------
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