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

Posted by Vytautas Dargis
Vytautas Dargis
5,715 Points

Please help solve this case.

Below is the code for the last code challenge. This would work better as a do...while loop. Re-write the code using a do...while loop.

script.js 
var secret = prompt("What is the secret password?");
while ( secret !== "sesame" ) {
  secret = prompt("What is the secret password?");    
}
document.write("You know the secret password. Welcome.");
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Loops</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>

2 Answers

Jason Anders
MOD
Jason Anders
Treehouse Moderator 145,858 Points
Jason Anders
Jason Anders
Treehouse Moderator 145,858 Points

Hi... To change from a 'do' loop to a 'do while' loop is just a matter of a little re-arranging.

You still do need to declare the variable first before the loop, but with the do/while loop, you want an empty variable declared. You want this because you need to use the variable in the loop, but you do not want to re-declare it each time the loop runs.

The second part, is telling what you want the loop to 'do' (in this case, it's to prompt for the password.

You want this loop to run every time (or "while") the answer is wrong.

If the answer is right, the loop doesn't execute and the final line of code does.

Here is the complete code. I hope it makes more sense now.

var secret;

do {
  secret = prompt("What is the secret password?");
} while ( secret !== "sesame" );

document.write("You know the secret password. Welcome.");

Keep coding! :)

David DeWeaver
David DeWeaver
3,701 Points
David DeWeaver
David DeWeaver
3,701 Points

Very helpful! I was confused about this challenge too.

Eric Trego
Eric Trego
15,308 Points
Eric Trego
Eric Trego
15,308 Points

so are you looking for something like this.

do {
  var secret = prompt("What is the sectret password?");
} while ( secret !== "seasame"){}

document.write("You know the secret password. Welcome.");