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JavaScript

Posted by Alexander D
Alexander D
8,685 Points

A loop with two exits, is that possible?

Hello there,

I am working through a simple program, but I do not quite understand how to break through the loop.

The program is asking you to guess a number between 1 to 10. If you get it right, you break the loop. The problem is that I want to give a maximum of 10 guesses, and if you get to 0, you loose.

At this point, it would be like a loop with two exit tunnels, but I do not know if the while-do loop allows that. Maybe I have to rewrite the program in a different way, but I am looking to suggestions.

In the program below I am revealing the random number, so that it's easier to guess:

  var TriesLeft = 10;
  var guess = " ";


var Random = getRandomNumber(10);

function getRandomNumber (upper) {
return Math.floor( Math.random() * upper ) + 1; 
 }


do {

    guess = prompt("I am thinking of a number between 1 and 6. What is it? " + Random + " you have left " + TriesLeft + " attempts to get it right"); 
      TriesLeft = TriesLeft -1;

 if (parseInt(guess) === Random ) {

 } else if (isNaN(parseInt(guess))) {
   alert("This is not a number, please refresh and try again!");
 } else if (parseInt(guess) < Random ) {

  alert("The random number is higher, try again");

  }else if (parseInt(guess) > Random ) {

  alert("The random number is lower, try again");

  }

} while (parseInt(guess) !== Random );
   document.write("You got it!");

Is it possible to position another "while" statement? or an "else". I am just afraid that they will be inside the loop, so it won't work.

Thanks!

2 Answers

Juan Lopez
.a{fill-rule:evenodd;}techdegree seal-36
Juan Lopez
Treehouse Project Reviewer

You can break; out of a loop if you like. So in your code above you could do a conditional like

if (TriesLeft === 0){
document.write("Sorry you ran out of lives :-( ");
break;
}

Here is a link with more info.

Alexander D
Alexander D
8,685 Points

Hello Juan,

That's probably the element I was missing. I haven't seen yet, it will probably appear down the course.

I've tried placing it inside, when I do this, I am able to break out, but I am getting two messages this time:

"Sorry you ran out of lives :-( " and "You got it!".

Is there any recommended position for the break statement to work?

Thanks for your time!

Alexander D
Alexander D
8,685 Points
Alexander D
Alexander D
8,685 Points

Solution here for anyone stumbling upon this post.

To solve this, I simply left the while blank, and added two break points, which represent my exits:

 var TriesLeft = 3;
  var guess = " ";


var Random = getRandomNumber(10);

function getRandomNumber (upper) {
return Math.floor( Math.random() * upper ) + 1; 
 }


do {

    guess = prompt("I am thinking of a number between 1 and 6. What is it? " + Random + " you have left " + TriesLeft + " attempts to get it right"); 
      TriesLeft = TriesLeft -1;

 if (parseInt(guess) === Random ) {

 } else if (isNaN(parseInt(guess))) {
   alert("This is not a number, please refresh and try again!");
 } else if (parseInt(guess) < Random ) {

  alert("The randon number is higher, try again");

  }else if (parseInt(guess) > Random ) {

  alert("The randon number is lower, try again");


} if (TriesLeft === 0){
document.write("Sorry you ran out of lives :-( ");
break;
}if (parseInt(guess) === Random){
document.write("you win ");
break;
 }  
} while (parseInt(guess) !== Random );