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  1. class Numeric
  2. 	def palindrome?
  3. 		self.to_s == self.to_s.reverse
  4. 	end
  5. end
  6.  
  7. p (1..999).to_a.combination(2).map{|(x1, x2)|  x1 * x2 }.select(&:palindrome?).max
  8. p Numeric.superclass
Success #stdin #stdout 0.88s 14560KB
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https://ideone.com/sRHEdn
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
public

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