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

Posted by Brian Campbell
Brian Campbell
12,544 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

Help! I'm stuck on this question and I tried multiple sources to learn how to solve this. Still no luck...

script.js 
do {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

Marcus Parsons
Marcus Parsons
15,719 Points

Hi Brian,

do while blocks follow this pattern:

do {
//some code
}
while (somethingIsTrue)

If you read the words as I wrote them it says "do some code while something is true".

The first step is to just create the secret variable. There's no need to set it equal to anything because of the next step which involves the do while loop. Do while loops always execute the code within the code block first before checking the conditional statement (the statement inside the parenthesis beside while).

This means that once we create the secret variable, we can prompt for the secret inside the do while loop because it will automatically execute before it checks whether secret is not equal to "sesame". As long as secret doesn't equal "sesame", you'll have to keep guessing until you get it.

Here is that in action:

var secret;

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

document.write("You know the secret password. Welcome.");
Jacob Mishkin
Jacob Mishkin
23,118 Points
Jacob Mishkin
Jacob Mishkin
23,118 Points 
var secret;
do {
  secret = prompt("What is the secret password?");    
}
while ( secret !== "sesame" )
document.write("You know the secret password. Welcome.");

you need to change up the code a bit. here is a great resource on do while loops:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/do...while