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  1. def f(n)
  2.   puts "Computing #{n}*#{n}"
  3.   n*n
  4. end
  5.  
  6. m = Hash.new{|hash, key| hash[key] = f(key)} 
  7.  
  8. puts m[9]
  9. puts m[4]
  10. puts m[9]
  11. puts m[4]
  12. puts m[4]
  13. puts m[9]
  14. puts m[3]
Success #stdin #stdout 0.01s 7956KB
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stdin
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Standard input is empty
stdout
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Computing 9*9
81
Computing 4*4
16
81
16
16
81
Computing 3*3
9
https://ideone.com/kbC7OB
language:
Ruby (ruby 2.5.5)
created:
264 days ago
visibility:
secret

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