main.js

const quiz = [
  {name: "Superman", realName: "Clark Kent"},
  {name: "Wonder Woman", realName: "Diana Prince"},
  {name: "Batman", realName: "Bruce Wayne"},
];

const game = {
  start(quiz) {
    this.questions = [...quiz];
    this.score = 0;
  
    // main game loop
    for (const question of this.questions) {
      this.question = question;
      this.ask();
    }
  
    // end of main game loop
    this.gameOver();
  },
  
  ask() {
    const question = `What is ${this.question.name}'s real name?`;
    const response = prompt(question);
    this.check(response);
  },
  
  check(response) {
    const answer = this.question.realName;
    if (response === answer) {
      alert('Correct!');
      this.score++;
    } else {
      alert(`Wrong! The correct answer was ${answer}`);
    }
  },
  
  gameOver() {
    alert(`Game Over, you scored ${this.score} point${this.score !== 1 ? 's' : ''}`);
  }
};

game.start(quiz);