generate bingo card

bingo.rb

class Bingo
  def self.generate
    [*1..75]
    .each_slice(15)
    .map { |v| v.sample(5) }
    .tap { |a| 
      a[2][2] = nil # (´；ω；｀)
      break a.unshift('BINGO'.chars)
    }
    .map { |v|
      v.map { |s|
        s.to_s.rjust(2)
      }.join(' | ')
    }
    .join("\n")
  end
end