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

Posted by Brian van Vlymen
Brian van Vlymen
12,637 Points

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

I am stuck for a while I do not understand what am I suppose to edit the challenge Task 1 of 1.

Do I have to rewrite the code using a do without the conditional? I am confused...

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.");

8 Answers

John Mutch
John Mutch
6,962 Points
John Mutch
John Mutch
6,962 Points

Hugo Paz, your code works as of 12:15 PST 02/18/2015. GREAT JOB!

var secret;
do {
  secret = prompt("What is the secret password?");    
}
while ( secret !== "sesame" )
document.write("You know the secret password. Welcome.");
Routine Poutine
Routine Poutine
26,050 Points

Wow. I was stuck here for an hour, not realizing I needed to declare the variable before defining it! Thanks for posting this. Any reason why defining the variable would not work in a program?

Adam Laszlo Vincze
Adam Laszlo Vincze
4,083 Points
Adam Laszlo Vincze
Adam Laszlo Vincze
4,083 Points

The right code is: 

var secret = '';
do {
secret = prompt("What is the secret password?")
}
while ( secret !== "sesame" )  {
}
document.write("You know the secret password. Welcome.");
Hugo Paz
Hugo Paz
15,622 Points
Hugo Paz
Hugo Paz
15,622 Points

Hi Brian,

You are supposed to change the original code:

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.");

to something that uses a do...while loop

do(....){
//code here
}while(...)
Micole Noddle
Micole Noddle
5,797 Points

Why are we supposed to be using a do...while loop when we haven't learned about do...while loops yet?

I can't get the above code to pass either. Totally stumped. Any other way to write it without a do...while loop?

James Maddox
James Maddox
17,154 Points
James Maddox
James Maddox
17,154 Points

I got it to pass with:

var secret;

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

Brian van Vlymen
Brian van Vlymen
12,637 Points
Brian van Vlymen
Brian van Vlymen
12,637 Points

error with red box said "Bummer! You only need to call the prompt() method once, and only inside the loop." Where can I put call the prompt() method once? 

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

???

Hugo Paz
Hugo Paz
15,622 Points

You are calling the prompt method once outside the loop, when you declare the variable secret. You just need to fix that and you are good to go.

Brian van Vlymen
Brian van Vlymen
12,637 Points

no wonder, keep it simply in JavaScript sometimes gave me hard time without the expression. lol thanks.

Lindsay Groves
Lindsay Groves
4,811 Points

So I removed the 

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

from inside the 'do' section and this passed allowed me to pass the challenge. However, that means that there is nothing in the 'do' part of the statement...just in the 'while' section. Can someone explain why this works?

Hugo Paz
Hugo Paz
15,622 Points

Could you post the whole code please?

Lindsay Groves
Lindsay Groves
4,811 Points 
var secret = prompt("What is the secret password?");
do {

}
while ( secret !== "sesame" ) {    
}
document.write("You know the secret password. Welcome.");
Hugo Paz
Hugo Paz
15,622 Points

There seems to be a bug. That code is wrong. I will contact support.

Lindsay Groves
Lindsay Groves
4,811 Points

Ok, thank you, Hugo. I couldn't understand why it worked. So, I'm trying several other things because that code was incorrect. However, for a few things I've done it has said it is correct, but now I don't know if it's just a bug or if it really is correct. Can you help me understand what kind of thing should be going in the 'do' section?

Hugo Paz
Hugo Paz
15,622 Points

You should have something like this:

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

Basically the DO section contains the instructions to be run until the WHILE condition is met.

Lindsay Groves
Lindsay Groves
4,811 Points

Ok, so the var secret doesn't need to equated to the prompt outside of the loop? I see that you just defined var secret but then the prompt is included inside the loop. That totally makes sense. I was getting hung up on trying to define var secret with the prompt. Thank you, Hugo. And thank you, Brian, for pointing out the {} with the while section!

Hugo Paz
Hugo Paz
15,622 Points

I missed assigning the prompt value to the variable secret within the do loop.

Lindsay Groves
Lindsay Groves
4,811 Points

Got it. That works! Thanks for all the help.

Micole Noddle
Micole Noddle
5,797 Points
Micole Noddle
Micole Noddle
5,797 Points

@Froi, I'm experiencing it now. Can't get it to pass. How did you end up getting it to work?

Lindsay Groves
Lindsay Groves
4,811 Points

Micole, did you check your do while loop with the one posted above by Hugo? Can you paste the code you've been trying to run so we can see what's going on?

Brian van Vlymen
Brian van Vlymen
12,637 Points
Brian van Vlymen
Brian van Vlymen
12,637 Points

try remove the curly brace for while.

Froi Nunez
Froi Nunez
12,133 Points

I tried it with a "do while" loop but I get an error that says " stick with just the while loop" Did anyone else experience this? I've had trouble getting it to work.

Micole Noddle
Micole Noddle
5,797 Points
Micole Noddle
Micole Noddle
5,797 Points

@Lindsay, I used the code below and it ended up passing, but I'm confused as to why it did since there are a lot of varying explanations on the forums...also this challenge is before we learn about do...while loops. That's the next video. If I used a do...while loop the code wouldn't pass, I kept getting an error saying NOT to use a do...while loop. Very confusing! Hugo's would not pass, because the challenge wouldn't accept a do...while loop.

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

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

Hugo Paz
Hugo Paz
15,622 Points

This is weird. I just tried my code and it works. Your code on the other hand gives an error saying that you are using a loop, just not a do while loop.

Lindsay Groves
Lindsay Groves
4,811 Points

Hmm...I wonder if this is a bug we might need to report, especially since it was accepting my earlier code and that was clearly incorrect.

Micole Noddle
Micole Noddle
5,797 Points

I have no idea why I was getting errors. @lindsay, I definitely think it's a bug. Thank you Hugo Paz for contacting support! I don't know why do...while loops would even be in the challenge since they don't even show up until the next video. Oh well. Thanks for your help, guys! Really appreciate it!