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  1. def factorial(n, total = "#{n}")
  2.   n > 1 ? factorial(n - 1,
  3.       ")".prepend(total)
  4.         .tap { |r| 
  5.           (n - 1).downto(2) { 
  6.             [" + ", total].each { |seq|
  7.               r.prepend(seq) 
  8.             }
  9.           }
  10.         }.prepend("(")) : total
  11. end
  12.  
  13. puts(f = factorial(6))
  14. puts(eval(f))
Success #stdin #stdout 0.01s 7420KB
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stdin
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Standard input is empty
stdout
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(((((6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6)) + ((6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6)) + ((6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6))) + (((6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6)) + ((6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6)) + ((6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6) + (6 + 6 + 6 + 6 + 6)))))
720
https://ideone.com/WMhvOl
language:
Ruby (ruby 2.5.5)
created:
11 years ago
visibility:
public

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