write me a javascript program that drives a single-page web application that tests users knowledge with multiple-choice questions
user
Sure, here's a simple JavaScript program that can be used in a single-page web application to test users' knowledge with multiple-choice questions.

HTML template:

```html
<template>
  <div id="app">
    <h1>Quiz: {{ question.text }}</h1>
    <p>{{ question.description }}</p>

    <ul>
      <li v-for="option in question.options" :key="option.text">
        <label>
          <input
            type="radio"
            v-model="selectedOption"
            :value="option.text"
          />
          {{ option.text }}
        </label>
      </li>
    </ul>

    <button @click="checkAnswer">Check</button>
  </div>
</template>
```

JavaScript:

```javascript
Vue.component('app', {
  data() {
    return {
      // initialize the data here
    };
  },
  computed: {
    question() {
      // get the question from the data
      return this.questions[this.currentQuestion];
    },
    selectedOption: {
      // get and set the current user's selected option
      get() {
        return this.userAnswers[this.currentQuestion];
      },
      set(value) {
        this.userAnswers[this.currentQuestion] = value;
      },
    },
  },
  methods: {
    checkAnswer() {
      // check the selected option
      const isCorrect = this.question.correctOption === this.selectedOption;

      // update the UI and store the answer
      this.userAnswers[this.currentQuestion] = this.selectedOption;

      // move to next question or show result
      if (this.isLastQuestion) {
        // show result or reset the quiz
      } else {
        this.currentQuestion++;
      }
    },
  },
  created() {
    // load the initial question
    this.currentQuestion = this.questions.length - 1;
  },
});

new Vue({
  render: h => h('app'),
}).$mount('#app');
```

This JavaScript program uses Vue.js for creating a reactive component that can be mounted on an HTML element. You'll need to provide the questions and options data in the `data()` method, and initialize the `currentQuestion`, `isLastQuestion`, and `userAnswers` data properties.

The HTML template is a simple layout that shows the question, options, and a "Check" button. The selected answer (`selectedOption`) is bound to the user's choices.

The `checkAnswer()` method checks if the selected option matches the correct answer, updates the UI and the user's answer, and advances to the next question or shows the result.

In a real-world application, you'll need additional functionality like data storage, result calculation, and feedback UI.

Feel free to modify this as per your requirements or use this snippet as a starting point.
assistant
write me a javascript program that drives a single-page web application that tests users knowledge with multiple-choice questions
user
Here's an example of a simple single-page web application that tests users' knowledge with multiple-choice questions using JavaScript:
```html
<!DOCTYPE html>
<html>
<head>
  <title>Quiz App</title>
</head>
<body>
  <h1>Quiz App</h1>
  <div id="quiz-container"></div>
  <button id="next-button">Next</button>
  <script>
    const questions = [
      {
        question: 'What is the capital of France?',
        choices: ['Paris', 'London', 'Rome', 'Madrid'],
        answer: 0
      },
      {
        question: 'What is the largest planet in our solar system?',
        choices: ['Earth', 'Jupiter', 'Saturn', 'Mars'],
        answer: 1
      },
      {
        question: 'Who wrote the novel "1984"?',
        choices: ['George Orwell', 'Aldous Huxley', 'Ray Bradbury', 'Philip K. Dick'],
        answer: 0
      }
    ];

    let currentQuestionIndex = 0;

    function showQuestion() {
      const questionElement = document.createElement('div');
      questionElement.innerHTML = `<p>${questions[currentQuestionIndex].question}</p>`;

      const choicesElement = document.createElement('div');
      for (let i = 0; i < questions[currentQuestionIndex].choices.length; i++) {
        const choiceElement = document.createElement('button');
        choiceElement.textContent = questions[currentQuestionIndex].choices[i];
        choiceElement.addEventListener('click', () => checkAnswer(i));
        choicesElement.appendChild(choiceElement);
      }

      questionElement.appendChild(choicesElement);

      const quizContainer = document.getElementById('quiz-container');
      quizContainer.innerHTML = '';
      quizContainer.appendChild(questionElement);
    }

    function checkAnswer(userAnswer) {
      if (userAnswer === questions[currentQuestionIndex].answer) {
        alert('Correct!');
      } else {
        alert('Incorrect.');
      }

      currentQuestionIndex++;
      if (currentQuestionIndex < questions.length) {
        showQuestion();
      } else {
        alert('Quiz complete!');
      }
    }

    document.getElementById('next-button').addEventListener('click', showQuestion);
  </script>
</body>
</html>
```
This code defines an array of questions, each with a question text, an array of choices, and the index of the correct answer. The `showQuestion` function displays the current question and the available choices, and the `checkAnswer` function checks the user's answer and moves to the next question if there are more questions left. The app starts by displaying the "Next" button, and when the user clicks it, the first question is displayed. When the user selects an answer, the `checkAnswer` function is called to check if the answer is correct, and if so, it moves to the next question. When all the questions have been answered, the app displays a "Quiz complete!" alert.
assistant