euler/euler004.rb

require_relative 'euler'

def products_of_three_digits
  products = []
  (100..999).each do |i|
    (100..999).each do |j|
      products << i*j
    end
  end
  products
end

def solution
  products_of_three_digits.select { |x| Euler.palindrome?(x) }.max
end