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JavaScript

Tomas Rinblad
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Tomas Rinblad
Full Stack JavaScript Techdegree Student 12,427 Points
Posted by Tomas Rinblad
.a{fill-rule:evenodd;}techdegree
Tomas Rinblad
Full Stack JavaScript Techdegree Student 12,427 Points

Why is my code in JavaScript looping endless? - Solved

var randomNumber = getRandomNumber(10); var guess; var guessCount = 0; var correctGuess = false; var computerCount = 0; var computerGuess = false;

function computer () { var guess = getRandomNumber(10); return guess; }

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

do { guess = prompt("I am thinking of a number between 1 and 10. What is it?"); guessCount += 1; if (parseInt(guess) === randomNumber){ correctGuess = true; } } while (! correctGuess )

do { computer (); computerCount += 1; if ( parseInt( computer ) === randomNumber) { computerGuess = true; } } while (! computerGuess)

document.write("<h1>You guessed the number!</h1>");
  document.write("<p> It took you " + guessCount + " times to find the correct number!</p>");
    document.write("<p> And it took the computer " + computerCount + " tries</p>");

I am trying to make the code first make you as an user guess the number. When you have guessed and gotten the correct answer the computer does the same thing. But it seems that this code are doing an endless loop (chrome crashing all the time). I am not totaly sure why this is happening (crashing/looping) anyone that can see the fault?

2 Answers

Steven Parker
Steven Parker
229,657 Points
Steven Parker
Steven Parker
229,657 Points

You're treating a function like a string.

For the computer turn, you call the computer() function but you don't store the return value anywhere. Then, you attempt to convert the function itself into an integer and compare it with the chosen number. This will always fail and so the loop repeats forever.

You can correct and simplify the computer turn a bit by calling the computer() function directly in the test since it the number it picks does not need conversion.

do {
  computerCount += 1;
  if (computer() === randomNumber) {
    computerGuess = true;
  }
} while (!computerGuess);

You could also simplify it a bit more by performing the test directly in the while expression:

do {
  computerCount += 1;
} while (computer() != randomNumber);