CODEWITHSUNDEEP
javascriptarraysconstructor
Ben Mikola
Ben Mikola

Reputation: 111

Why am i getting error of "cannot set property of undefined"?

  const quiz = new quiz(questions);

  populate();

  function Question(text, choices, answer){
    this.text = text;
    this.choices = choices;
    this.answer = answer;
  }
  
  Question.prototype.correctAnswer = function(choices){
    return choice === this.answer;
  }

  function Quiz(questions){
    this.score = 0;
    this.questions = questions;
    this.questionIndex = 0;
  }
  
  quiz.prototype.getQuestionIndex = function(){
    return this.questions[this.questionIndex];
  }
  
  quiz.prototype.isEnded = function(){
    return this.questions.length === this.questionIndex;
  }
  
  quiz.protype.guess = function(answer){
    this.questionIndex++;
  
    if(this.getQuestionIndex().correctAnswer(answer)){
      this.score++;
    }
  }

When I run this code, it says it cannot set 'getQuestionIndex' to undefined. But didn't Ique set it to 0? I set this.questionIndex to 0 in my Quiz constructor. What am I missing here?

Upvotes: 0

Views: 29

Answers (1)

lakshitha madushan
lakshitha madushan

Reputation: 669

const quiz = new quiz(questions); should be const quiz = new Quiz(questions);

Upvotes: 1

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