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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops A Closer Look At Loop Conditions

Jesse Fister
Jesse Fister
11,968 Points
Posted by Jesse Fister
Jesse Fister
11,968 Points

The code in app.js just opens a prompt, asks for a password, and writes to the document. Something is missing.

I know this one is simple simple but I'm stuck on this one. The code in app.js just opens a prompt, asks for a password, and writes to the document. Something is missing. Add a while loop, so that a prompt keeps appearing until the user types "sesame" into the prompt. I understand the while loop

while ( ) {

}

I'm just not sure what to put in it. A hint would be great. Thanks.

app.js 
var secret = prompt("What is the secret password?");

while (  ) {

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


//while ( guess !== RandomNumber ) {
//  guess = RandomNumber( upper );
index.html 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript Loops</title>
</head>
<body>
<script src="app.js"></script>
</body>
</html>

13 Answers

Mark Long
Mark Long
15,763 Points
Mark Long
Mark Long
15,763 Points

Remember that "the response from the prompt gets stored in the variable (var secret = response)." This means that "sesame" ought to be compared against the "response" which is the "var secret" variable. When the response does not equal the "sesame" password the expression evaluates "True" and the statement inside the while loop is executed. If it evaluates "False" the loop is broken and the next line of code is parsed.

In the loop below any answer other than "sesame" will cause the expression to evaluate "True" because the wrong answer is not equal (!==) to the right answer (it is "True" that the Response is not equal (!==) to the Password). That being the case the statement inside the while loop will execute and it causes a new prompt to occur requesting the secret password.

Once the user enters the correct password the expression will evaluate "False" because the correct password is equal to the correct password (it is "False" that the Response is not !== to the Password because the Response is equal (==) to the Password which make the expression evaluate "False.") and we jump the loop.

so...

var secret = prompt("What is the secret password?");

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

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

Lindsay Groves
Lindsay Groves
4,811 Points
Lindsay Groves
Lindsay Groves
4,811 Points

Thank for you this alternate explanation - it made a lot of sense to me!

damian celentano
damian celentano
3,822 Points

Brilliant explanation, thank you very much

Chris Feltus
Chris Feltus
3,970 Points
Chris Feltus
Chris Feltus
3,970 Points

The answer posted by @Ali Amirazizi is incorrect and causes an infinite loop. It will pass the treehouse code challenge test for some reason, but if you run it in your browser it will create an infinite loop. It will not exit the loop even if you provide the correct answer 'sesame'.

Here is the correct answer 

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.");
Ali Amirazizi
Ali Amirazizi
16,087 Points
Ali Amirazizi
Ali Amirazizi
16,087 Points

Thanks for the correction, I will delete my comment.

Sean Flanagan
Sean Flanagan
33,235 Points
Sean Flanagan
Sean Flanagan
33,235 Points

Hi Chris.

I just tried your solution successfully. I would give you Best Answer but there's no such option under your comment. I've voted it up all the same.

Thanks

Sean :-)

Christian Solorzano
Christian Solorzano
6,606 Points
Christian Solorzano
Christian Solorzano
6,606 Points

I don't understand this. Why is 

secret = prompt("What is the secret password?");

underneath

while ( secret !== "sesame" ) {
AVALONcomu Profile
AVALONcomu Profile
36,146 Points
AVALONcomu Profile
AVALONcomu Profile
36,146 Points

Try this. You should check if password is "sesame"

while (guess !== "sesame")

P.S. put one more secret = prompt() inside while to check password again and again.

Mekale Mccraney
Mekale Mccraney
6,035 Points
Mekale Mccraney
Mekale Mccraney
6,035 Points

do{secret= prompt(“What is the secret password?”); } while(secret !== “sesame”) alert(“You know the secret password. Welcome!”)

hamcrjside
hamcrjside
4,599 Points
hamcrjside
hamcrjside
4,599 Points

I did it slightly different but it works.

var secret = prompt("What is the secret password?");
var password = "sesame"

while ( secret !== password  ) {
  secret = prompt("Secret password incorrect. Please try again.");
}

document.write("You know the secret password. Welcome.");
Manuel Pérez Vallenas
Manuel Pérez Vallenas
11,862 Points
Manuel Pérez Vallenas
Manuel Pérez Vallenas
11,862 Points

Thank you!!

Danny McCollins
Danny McCollins
731 Points
Danny McCollins
Danny McCollins
731 Points

Thanks for the help, guys. I was confused by having to add another var secret = ...

Jacques Simon
Jacques Simon
6,594 Points
Jacques Simon
Jacques Simon
6,594 Points

hmm interesting. Thanks guys!

Wilton cruz-ramirez
Wilton cruz-ramirez
10,159 Points
Wilton cruz-ramirez
Wilton cruz-ramirez
10,159 Points

thanks you so much guys!.

Mehran Moradi
Mehran Moradi
11,140 Points
Mehran Moradi
Mehran Moradi
11,140 Points

I am very confused. What is the reason to have another variable while we have a text name "sesame"???

var secret = prompt("What is the secret password?"); var password = "sesame"

while ( secret !== password ) { secret = prompt("Secret password incorrect. Please try again."); }

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

Omar Ocampo
Omar Ocampo
3,166 Points
Omar Ocampo
Omar Ocampo
3,166 Points

var secret = prompt("What is the secret password?"); var password = "sesame"

var count = 0 while ( secret !== password ) { secret = prompt("Secret password incorrect. Please try again."); }

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

"This was my answer because it was stated for only once"

Vahe Gharagiozyan
Vahe Gharagiozyan
10,088 Points
Vahe Gharagiozyan
Vahe Gharagiozyan
10,088 Points

Here is another way of doing it.

let secret = "sesame";

do{secret = prompt("What is the secret password?"); }while(secret != "sesame") alert("You know the secret password. Welcome!")

Mekale Mccraney
Mekale Mccraney
6,035 Points

This would be the correct answer