Hacking a Lock

gistfile1.txt

class Hack
attr_accessor :possible, :array, :final_answer
  def initialize
    @possible = ["A","B","C","D"]
    @array = []
    @final_answer = []
    self.generate
    self.process_array
  end

  def generate
    self.possible.each do |letter|
      self.possible.each do |two|
        self.possible.each do |three|
          self.possible.each do |four|
            @array << letter
            @array << two
            @array << three
            @array << four
          end
        end
      end
    end
  end

  def process_array
    string = self.array.join("")
    first_string = self.array.drop(1).join("")
    second_string = self.array.drop(2).join("")
    third_string = self.array.drop(3).join("")
    string.scan(/.{3}/).each{|x|final_answer<<[x]}
    first_string.scan(/.{3}/).each{|x|final_answer<<[x]}
    second_string.scan(/.{3}/).each{|x|final_answer<<[x]}
    third_string.scan(/.{3}/).each{|x|final_answer<<[x]}
    @final_answer.uniq!
    @final_answer = @final_answer.join.to_s
  end

  def tell_me_the_answer
    puts "the minimum number of characters you must enter to ensure that you can break the lock is #{@final_answer.size}"
    puts "or #{@final_answer.size/3} 3 character combinations"
    puts "and the sequence that will break the lock is this:"
    puts @final_answer
  end
end