Javascript 5 - Loops and Function

Part 1

• Task 1.2: Generate a Single Clue
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  function evaluateClue(clue){
      var i, N = 0; 
      for (i = 0; i < clue.length; i++) {
          var d = Number(clue[i]);
          if (d === 0 || d === 4 || d === 6 || d === 9) {
              N += 1;
          } else if (d === 8) {
              N += 2;
          }
      }
      return N;
  }
  
  function generateOne(){
      var clue = generateRandom4DigitText();
      var result = evaluateClue(clue);
      document.getElementById("clue_area").innerHTML = clue + " = " + result + "<br/>";
  }

• Task 1.3: Generate 10 Clues Using For-Loop
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  function generateTen(){
      var index, s = "";
      for (index = 0; index < 10; index++) {
          var clue = generateRandom4DigitText();
          var result = evaluateClue(clue);
          s += clue + " = " + result + "<br/>";
      }
      document.getElementById("clue_area").innerHTML = s;
  }

• Task 1.4: Check the User's Answer
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  function checkAnswer(){
      var answer = document.getElementById("textboxanswer").value;
      
      if (isNaN(answer)) {
          document.getElementById("feedback").innerHTML = "Please enter a number in the textbox.";
      } else {
          if (Number(answer) === evaluateClue(clueQuestion)) {
              document.getElementById("feedback").innerHTML = "Correct!";
          } else {
              document.getElementById("feedback").innerHTML = "Wrong!";
          }
      }
  }

Part 2

• Task 2.1: Generate Clues Until All Digits are Present
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  function generateAllDigits(){
      var appeared = [false, false, false, false, false, false, false, false, false, false];
      var allAppeared = false;
      var s = "";
  
      while (!allAppeared) {
          var clue = generateRandom4DigitText();
          var result = evaluateClue(clue);
          s += clue + " = " + result + "<br/>";
  
          for (var i = 0; i < 4; i++) {
              appeared[Number(clue[i])] = true;
          }
  
          allAppeared = true;
          for (var j = 0; j < 10; j++) {
              if (appeared[j] === false) {
                  allAppeared = false;
                  break;
              }
          }
      }
      document.getElementById("clue_area").innerHTML = s;
  }