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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops `do ... while` Loops

Sharath Chandra
Sharath Chandra
3,957 Points
Posted by Sharath Chandra
Sharath Chandra
3,957 Points

Could someone please review the code.

I've tried to rewrite the instructors code in the do while loop video as follows. Could someone review the code please. 

var randomNumber = getRandomNumber(10);
var guess;
var guessCount = 0;
var correctGuess = false;

function getRandomNumber( upper ) {
  var num = Math.floor(Math.random() * upper) + 1; 
  return num;
}

do {
  guess = parseInt(prompt("Guess the number"));
  guessCount += 1;
} while ( guess !== randomNumber )

document.write("<h1>You guessed the number!</h1>");
document.write("<p>It took you " + guessCount + " attempts to guess the number " + randomNumber);
Jose Gallardo
Jose Gallardo
1,662 Points
Jose Gallardo
Jose Gallardo
1,662 Points

It works properly. As an exercise I suggest that after every try you can give a little hint to the user.

For example, if the input number is lower than the winner number, print a message saying "The winner number is higher". And the same way when the input number is higher than the winner one.

Lastly, after 3 tries you can output a message saying "I'm sorry you didn't guess the number", and then the game ends.

2 Answers

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

It looks OK at first glance — are you having any trouble with it?

Sharath Chandra
Sharath Chandra
3,957 Points
Sharath Chandra
Sharath Chandra
3,957 Points

Hi Steven. Thanks for your response. The code works fine. I've an other question in the code below. If I add the variable var html = "<ol>" inside the for loop, the only output I see is 4.Mango. However, if I add the variable var html = "<ol>" outside the loop, I see all the array items as an ordered list as expected. I'm having trouble understanding why placing the var html = "<ol>" inside the loop is causing to display just the last item in the Array. 

<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var html = "<ol>";
for (var i = 0; i < fruits.length; i++) {

    html += "<li>" + fruits[i] + "</li>";
}
html += "</ol>";

document.getElementById("demo").innerHTML = html;
<script>
Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

If you place html = "<ol>" inside the loop, then each loop will wipe out everything that was previously put into the "html" variable. So only the last one remains when the loop finishes.

Placing it before the loop makes sense for two reasons:

  • it creates the variable and initializes it
  • you only want one <ol> tag, at the beginning of the list
Balázs Buri
Balázs Buri
8,799 Points
Balázs Buri
Balázs Buri
8,799 Points

you can remove the

var correctGuess = false;

line. it's an unused variable