lame.rb

score = 0
 
questions.each do |question|
  invalid_answer = true
  
  while invalid_answer
    puts question["text"]
    
    question["answers"].each_with_index do |answer, index|
      values = ["a","b","c","d"] 
      puts "#{values[index]}) #{answer}"
    end
  
    answer = gets.strip.downcase
    values = ["a","b","c","d"] 
    if values.index(answer)
      invalid_answer = false
      
      if values.index(answer)  == question["correct"] 
        puts "Spravne!"
        score += 1
      else
        puts "Spatne"
        correct_answ_index = question["correct"]
        correct_answ = question["answers"][correct_answ_index]
        puts "Spravna odpoved je #{correct_answ}"  
      end
      
    else
      puts "Spatny format, prosim odpovezte a,b,c nebo d"
      
    end
  end
end
 
puts "GRATULUJI! Ziskla jste #{score} bodu z 9"