Generate random numbers without repetition

<button onclick="generateRandomQuestion()">Random Question</button>
<script>
  let questionIndex = 0;

let myArray = [];

let myApp = [{
    no: "1",
    question: "Question 1"
  },
    {
      no: "2",
      question: "Question 2"
    },
    {
      no: "3",
      question: "Question 3"
    },
    {
      no: "4",
      question: "Question 4"
    },
    {
      no: "5",
      question: "Question 5"
    },
    {
      no: "6",
      question: "Question 6"
    }]
  function generateRandomQuestion() {
    const randomNumber = Math.floor(Math.random() * myApp.length);

let hitDuplicate = 0;

if (myArray.length == 0) {
      questionIndex = randomNumber;
    } else {
      for (let i = 0; i < myArray.length; i++) {
        if (randomNumber == myArray[i]) {
          hitDuplicate = 1;

}
      }
      if (hitDuplicate == 1) {
        generateRandomQuestion();
        return;
      } else {
        questionIndex = randomNumber;
      }
    }

myArray.push(randomNumber);
    // alert(questionIndex);
    alert(myApp[questionIndex].question);
    // alert(myApp[questionIndex].no);
  }
</script>

Generate random numbers without repetition

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