Find the largest palindrome made from the product of two 3-digit numbers

euler-004.rb

#!/usr/bin/env ruby

# A palindromic number reads the same both ways. The largest palindrome made
# from the product of two 2-digit numbers is 9009 = 91 99. Find the largest palin-
# drome made from the product of two 3-digit numbers.
# Solution:

palindromes = []
(100..999).each do |x|
  (100..999).each do |y|
    product = x * y
    palindromes << product if product.to_s == product.to_s.reverse
  end
end
palindromes.sort[-1]