Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

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

My do loop runs one more time after the correct answer 'sesame' has been inputted. Why is this happening?

I made a few edits and now the prompt isn't even coming up.

script.js
let secret;
do {
  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>

1 Answer

Ben Slivinn
Ben Slivinn
10,156 Points

Hi, you are stuck in an infinite loop. The do while loop will execute at least one time the code inside "do {}", during the condition in " while ()".

The right structure of the loop should be

do { 
   secret = prompt("What is the secret password?");
} while (secret !== 'seesame);
document.write("You know the secret password. Welcome.");

Literally: Do the code in curly brackets one time at least, then check the condition in round brackets, if the condition met, break the loop, else do the code over again. When the loop breaks, write something.

I see! Thank you so much for clarifying that Ben. All the sources I looked up tended to underexplain do loops.