lab

index.html

@@ -39,7 +39,7 @@ <h1>JavaScript Quiz</h1>
           <div id="result"></div>
         </div>
         <!-- The below 'Restart Quiz' button is commented out because it is not used initially -->
-        <!-- <button id="restartButton" class="button-secondary">Restart Quiz</button> -->
+        <button id="restartButton" class="button-secondary">Restart Quiz</button>
       </div>
     </div>
 

src/index.js

@@ -89,86 +89,105 @@ document.addEventListener("DOMContentLoaded", () => {
 
     // Get the current question from the quiz by calling the Quiz class method `getQuestion()`
     const question = quiz.getQuestion();
+
     // Shuffle the choices of the current question by calling the method 'shuffleChoices()' on the question object
     question.shuffleChoices();
-
-
 
-    // YOUR CODE HERE:
-    //
-    // 1. Show the question
-    // Update the inner text of the question container element and show the question text
-
-
-    // 2. Update the green progress bar
-    // Update the green progress bar (div#progressBar) width so that it shows the percentage of questions answered
+    // Update the green progress bar
+    const progressPercentage = ((quiz.currentQuestionIndex + 1) / quiz.questions.length) * 100;
+    progressBar.style.width = `${progressPercentage}%`;
 
-    progressBar.style.width = `65%`; // This value is hardcoded as a placeholder
-
-
+    // Update the question count text
+    questionCount.innerText = `Question ${quiz.currentQuestionIndex + 1} of ${quiz.questions.length}`;
+
+    // Display the question text
+    questionContainer.innerText = question.text;
+
+    // Create and display new radio input with a label for each choice
+    question.choices.forEach((choice, index) => {
+      // Create radio input element
+      const radioInput = document.createElement("input");
+      radioInput.type = "radio";
+      radioInput.name = "choice";
+      radioInput.id = `choice${index}`;
+      radioInput.value = choice;
+
+      // Create label element
+      const label = document.createElement("label");
+      label.htmlFor = `choice${index}`;
+      label.innerText = choice;
+
+      // Create a div to contain the radio and label
+      const choiceDiv = document.createElement("div");
+      choiceDiv.classList.add("choice");
+      choiceDiv.appendChild(radioInput);
+      choiceDiv.appendChild(label);
+
+      // Add the choice to the choice container
+      choiceContainer.appendChild(choiceDiv);
+    });
+  }
 
-    // 3. Update the question count text 
-    // Update the question count (div#questionCount) show the current question out of total questions
+  function nextButtonHandler() {
+    const choiceElements = document.querySelectorAll('input[name="choice"]');
+    let selectedAnswer = null;
 
-    questionCount.innerText = `Question 1 of 10`; //  This value is hardcoded as a placeholder
-
-
+    choiceElements.forEach(choiceElement => {
+      if (choiceElement.checked) {
+        selectedAnswer = choiceElement.value;
+      }
+    });
 
-    // 4. Create and display new radio input element with a label for each choice.
-    // Loop through the current question `choices`.
-      // For each choice create a new radio input with a label, and append it to the choice container.
-      // Each choice should be displayed as a radio input element with a label:
-      /* 
-          <input type="radio" name="choice" value="CHOICE TEXT HERE">
-          <label>CHOICE TEXT HERE</label>
-        <br>
-      */
-      // Hint 1: You can use the `document.createElement()` method to create a new element.
-      // Hint 2: You can use the `element.type`, `element.name`, and `element.value` properties to set the type, name, and value of an element.
-      // Hint 3: You can use the `element.appendChild()` method to append an element to the choices container.
-      // Hint 4: You can use the `element.innerText` property to set the inner text of an element.
-
+    if (selectedAnswer !== null) {
+      quiz.checkAnswer(selectedAnswer);
+      quiz.moveToNextQuestion();
+      showQuestion();
+    } else {
+      alert("Please select an answer before proceeding!");
+    }
   }
 
+  function showResults() {
+    quizView.style.display = "none";
+    endView.style.display = "flex";
+    resultContainer.innerText = `You scored ${quiz.correctAnswers} out of ${quiz.questions.length} correct answers!`;
+    clearInterval(timer);
+  }
 
-
-  function nextButtonHandler () {
-    let selectedAnswer; // A variable to store the selected answer value
-
-
-
-    // YOUR CODE HERE:
-    //
-    // 1. Get all the choice elements. You can use the `document.querySelectorAll()` method.
-
-
-    // 2. Loop through all the choice elements and check which one is selected
-      // Hint: Radio input elements have a property `.checked` (e.g., `element.checked`).
-      //  When a radio input gets selected the `.checked` property will be set to true.
-      //  You can use check which choice was selected by checking if the `.checked` property is true.
-
+  function startTimer() {
+    timer = setInterval(() => {
+      quiz.timeRemaining--;
 
-    // 3. If an answer is selected (`selectedAnswer`), check if it is correct and move to the next question
-      // Check if selected answer is correct by calling the quiz method `checkAnswer()` with the selected answer.
-      // Move to the next question by calling the quiz method `moveToNextQuestion()`.
-      // Show the next question by calling the function `showQuestion()`.
-  }  
-
-
-
-
-  function showResults() {
+      const minutes = Math.floor(quiz.timeRemaining / 60).toString().padStart(2, "0");
+      const seconds = (quiz.timeRemaining % 60).toString().padStart(2, "0");
 
-    // YOUR CODE HERE:
-    //
-    // 1. Hide the quiz view (div#quizView)
-    quizView.style.display = "none";
+      const timeRemainingContainer = document.getElementById("timeRemaining");
+      timeRemainingContainer.innerText = `${minutes}:${seconds}`;
+
+      if (quiz.timeRemaining <= 0) {
+        clearInterval(timer);
+        showResults();
+      }
+    }, 1000);
+  }
 
-    // 2. Show the end view (div#endView)
-    endView.style.display = "flex";
+  function resetQuizHandler() {
+    endView.style.display = "none";
+    quizView.style.display = "block";
 
-    // 3. Update the result container (div#result) inner text to show the number of correct answers out of total questions
-    resultContainer.innerText = `You scored 1 out of 1 correct answers!`; // This value is hardcoded as a placeholder
+    quiz.currentQuestionIndex = 0;
+    quiz.correctAnswers = 0;
+    quiz.timeRemaining = quiz.timeLimit;
+
+    const minutes = Math.floor(quiz.timeRemaining / 60).toString().padStart(2, "0");
+    const seconds = (quiz.timeRemaining % 60).toString().padStart(2, "0");
+    timeRemainingContainer.innerText = `${minutes}:${seconds}`;
+
+    quiz.shuffleQuestions();
+
+    clearInterval(timer);
+    startTimer();
+
+    showQuestion();
   }
-
 });

src/question.js

@@ -1,7 +1,15 @@
 class Question {
-    // YOUR CODE HERE:
-    //
-    // 1. constructor (text, choices, answer, difficulty)
+    constructor (text, choices, answer, difficulty) {
+        this.text = text;
+        this.choices = choices;
+        this.answer = answer;
+        this.difficulty = difficulty;
+    }
 
-    // 2. shuffleChoices()
+    shuffleChoices() {
+      for (let i = this.choices.length -1; i > 0; i--) {
+        const j = Math.floor(Math.random() * (i+1));
+        [this.choices[i], this.choices[j]] = [this.choices[j], this.choices[i]];
+       }
+    }
 }

src/quiz.js

@@ -1,15 +1,62 @@
 class Quiz {
-    // YOUR CODE HERE:
-    //
-    // 1. constructor (questions, timeLimit, timeRemaining)
-
-    // 2. getQuestion()
+    constructor(questions, timeLimit, timeRemaining) {
+        this.questions = questions;
+        this.timeLimit = timeLimit;
+        this.timeRemaining = timeRemaining;
+        this.correctAnswers = 0;
+        this.currentQuestionIndex = 0; // Fixed: changed from correctQuestionIndex to currentQuestionIndex
+    }
+
+    getQuestion() {
+        return this.questions[this.currentQuestionIndex];
+    }
 
-    // 3. moveToNextQuestion()
+    moveToNextQuestion() {
+        this.currentQuestionIndex++; // Fixed: increment index, don't return question
+    }
 
-    // 4. shuffleQuestions()
+    shuffleQuestions() { 
+        for (let i = this.questions.length - 1; i > 0; i--) { // Fixed: changed i-0 to i>0
+            const j = Math.floor(Math.random() * (i + 1));
+            [this.questions[i], this.questions[j]] = [this.questions[j], this.questions[i]];
+        }
+    }
 
-    // 5. checkAnswer(answer)
+    checkAnswer(answer) {
+        const currentQuestion = this.getQuestion();
+        if (answer === currentQuestion.answer) {
+            this.correctAnswers++;
+            return true;
+        }
+        return false;
+    }
 
-    // 6. hasEnded()
-}
+    hasEnded() {
+        return this.currentQuestionIndex >= this.questions.length;
+    }
+     filterQuestionsByDifficulty(difficulty) {
+        // Check if difficulty is a number between 1 and 3
+        if (typeof difficulty === 'number' && difficulty >= 1 && difficulty <= 3) {
+            // Use filter() to keep only questions with the specified difficulty
+            this.questions = this.questions.filter(question => {
+                return question.difficulty === difficulty;
+            });
+        }
+        // If difficulty is not valid (not a number between 1-3), do nothing
+    }
+    averageDifficulty() {
+        // Handle edge case: empty questions array
+        if (this.questions.length === 0) {
+            return 0;
+        }
+
+        // Use reduce() to sum up all difficulty values
+        const totalDifficulty = this.questions.reduce((sum, question) => {
+            // Add current question's difficulty to the running sum
+            return sum + question.difficulty;
+        }, 0); // Start with initial value of 0
+
+        // Calculate and return the average
+        return totalDifficulty / this.questions.length;
+    }
+}