answer to the question how do I draw digital numbers in ruby?

digital.rb

#!/usr/bin/env ruby

$, = ' '

class Digits
  RAW = [
    " 111 ",
    "4   2",
    "4   2",
    " 333 ",
    "7   5",
    "7   5",
    " 666 ",
  ].join("\n")

  def self.single(n)
    digits = [
      [1,2,5,6,7,4],
      [2,5],
      [1,2,3,7,6],
      [1,2,3,5,6],
      [4,2,3,5],
      [1,4,3,5,6],
      [1,4,3,5,6,7],
      [1,2,5],
      [1,2,3,4,5,6,7],
      [1,2,3,4,5,6],
    ]

    RAW.gsub(/[^\s#{digits[n]}]/, ' ').gsub(/[^\s]/, 'x').split("\n")
  end

  def self.draw(n)
    n.to_s.split('').map(&:to_i).map(&Digits.method(:single)).reduce(:zip).map(&:join)
  end
end

N = 63234567

if rand > 0.5
  puts Digits.draw(N)
else
  # shorter version of it
  puts proc{|x,n|"#{n}".split('').map{|n|x[0].gsub(/[#{x[1][n.to_i]}]/,?\s).gsub(/\d/,'x').split("\n")}.reduce(:zip).map(&:join)}.call([" 11 \n4  2\n 33 \n7  5\n 66 \n", [[3],[1,3,4,6,7],[4,5],[4,7],[1,6,7],[2,7],[2],[3,4,6,7],[],[7]]], N)
end