Tips for adding a random element to your quiz

I've been attempting to randomize these quiz questions using the math random function, but my lack of experience is hindering my progress. How can I effectively randomize these questions for the quiz?

Is there a straightforward method to convert the questions into an array and then shuffle them for display on the browser? I have only included two questions in this example for simplicity, but I may include more.

var quiztitle = "Computer Hardware: Visual Quiz!";

/**
 * Enter your question details here. Make sure the correct answer string matches exactly
 * with the correct choice as it performs string matching (case sensitive).
 *
 */

var quiz = [{
    "question": "Q1: What is the name of this game?",
    "image": "https://lh3.googleusercontent.com/N6XB3KXpnQ4OAz5jDJi74XM8dvwfJxiwrObSLpd7hdy3HzCxW-cZY0Mu5hJORtjeqa0=h900",
    "choices":[
      "Minecraft",
      "Call of Duty",
      "Doom",
      "Toca Boca"
    ],
    "correct": "Minecraft",
    "explanation": "It is a picture of zombies in Minecraft!",
  }, {
    "question": "Q2: What game is this?",
    "image": "https://assets.vg247.com/current//2015/03/crossy_road_header_1.jpg",
    "choices": [
      "Run sackboy",
      "Call of Duty",
      "Minecraft",
      "Crossy road"
    ],
    "correct": "Crossy road",
    "explanation": "A picture of the signature chicken running across the road",
  },
];



/**** Do not edit below this line *****/
var currentquestion = 0,
  score = 0,
  submt = true,
  picked;

jQuery(document).ready(function($) {

  /**
   * Function to encode HTML for alt tags and attributes to prevent messy data inside tag attributes.
   */
  function htmlEncode(value) {
    return $(document.createElement('div')).text(value).html();
  }

  /**
   * Add individual choices for each question to the ul#choice-block
   *
   * @param {choices} array The choices from each question
   */
  function addChoices(choices) {
    if (typeof choices !== "undefined" && $.type(choices) == "array") {
      $('#choice-block').empty();
      for (var i = 0; i < choices.length; i++) {
        $(document.createElement('li')).addClass('choice choice-box').attr('data-index', i).text(choices[i]).appendTo('#choice-block');
      }
    }
  }

  // Other functions like nextQuestion, processQuestion, setupButtons, endQuiz and init follow...

});

Answer №1

If you're looking to add some randomness, I suggest checking out Chancejs and utilizing the pickone() function.

All you need to do is call chance.pickone(quiz) and voilà! You'll have a random quiz ready to go in no time.

Answer №2

To determine the next question, my suggestion is to randomly select an index from the questions array, remove it using the splice method, and then return either the removed value or an empty string if the array was already empty.

This can be achieved with vanilla JavaScript:

var questions = ['a', 'b', 'c'];

function getNextQuestion(){
  return questions.splice(Math.floor(Math.random() * questions.lengh), 1)[0] || "";
}

// Testing the functionality
for(var i = 0; i < 5; i++) console.log(getNextQuestion());

Alternatively, you can use rando.js, which offers a more readable and secure solution:

var questions = ['a', 'b', 'c'];

function getNextQuestion(){
  return questions.splice(rando(questions).index, 1)[0] || "";
}

// Testing the functionality
for(var i = 0; i < 5; i++) console.log(getNextQuestion());
<script src="https://randojs.com/2.0.0.js"></script>

If opting for the randojs code, remember to include the script tag in the head section of your HTML document.

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