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

Howard McConaghy
Howard McConaghy
2,926 Points
Posted by Howard McConaghy
Howard McConaghy
2,926 Points

Why is my code not working?

Hi, I tried completing the code myself before going along with the video and can't seem to figure out what is wrong with mine.

//Number guessing game
var upper = 10;
var guess;
var randomNumber = getRandomNumber(upper);
var counter = 0;
var correctGuess = false;
function getRandomNumber(upper) {
    var randomNumber = Math.floor(Math.random() * upper) + 1;
    return randomNumber;
}
do {
    guess = prompt("Guess a number between 1 and 10.");
    counter += 1;
    if (isNaN(guess)) {
        alert("Please guess a number.");
    }
    if (guess === randomNumber) {
        correctGuess = true;
    }
} while (!correctGuess);
document.write("<h>You guessed the number!</h>");
document.write("<p> It took you " + guess + " tries to guess the number " + randomNumber + ".</p>");
Howard McConaghy
Howard McConaghy
2,926 Points
Howard McConaghy
Howard McConaghy
2,926 Points

Never mind I figured it out - I was comparing a string to an integer.

1 Answer

Steven Parker
Steven Parker
231,268 Points
Steven Parker
Steven Parker
231,268 Points

I see two issues:

    if (guess === randomNumber) {

Since "guess" is a string, it will never match the number using the type-sensitive equality operator. You can use the normal operator (==) instead to allow the system to perform type coercion, or you can manually convert one of them to the other type.

document.write("<p> It took you " + guess + " tries to guess the number " + randomNumber + ".</p>");

The number of tries is stored in "count" instead of "guess".