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Leno Marin
Courses Plus Student 1,323 PointsWouldn't this run 'while' code block anyway?
In this code:
var secret = '';
do { secret = prompt("What is the secret password?"); }while ( secret !== "sesame" ) { document.write("You know the secret password. Welcome."); }
Wouldn't the while run the first time around whether it's true or false?
var secret = '';
do {
secret = prompt("What is the secret password?");
}while ( secret !== "sesame" ) {
document.write("You know the secret password. Welcome.");
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript Loops</title>
</head>
<body>
<script src="script.js"></script>
</body>
</html>
5 Answers
Sam Donald
36,305 PointsA while loop
while( condition-to-test )
{
// Do some funky code.
}
This funky cod may not ever run because the condition-to-test could validate on the first pass.
A do-while loop
do
{
// Some funky code
}
while( condition-to-test );
This funky code will definitely run at least once because the condition-to-test has not yet been assessed.
For your code
The user will continually be prompted to input the password until they input sesame.
The document.write line will not run until secret == sesame, because you never leave the loop until then. And thus no code below it can run.
Also, for your code
do {
secret = prompt("What is the secret password?");
} while (secret !== "sesame") {//Get rid of this bracket
document.write("You know the secret password. Welcome.");
}//Get rid of this bracket
You don't need those two curly brackets.
james south
Front End Web Development Techdegree Graduate 33,271 Pointsyes, that is the nature of do...while loops. they run at least once, whereas a while loop may not run at all.
Leno Marin
Courses Plus Student 1,323 PointsOkay. But I thought the whole point is to not document.write "You know the secret password. Welcome" until the prompt is "sesame". But if I understand correctly, the text will write regardless the first time around. Am I understanding that correctly.
james south
Front End Web Development Techdegree Graduate 33,271 Pointsyou can move the print out of the while block and still pass the challenge. i tried it both ways, both passed. in real life of course you wouldn't print welcome until the password had been entered, so that would be out of the while block, whereas in the while block like you have, i think would print every time but i don't have an ide to verify.
Leno Marin
Courses Plus Student 1,323 PointsGreat! Thanks.