Question

i guess this is a really simple problem, but i just can’t get it to work! I want that my menu should show up again after that i have run a method. Thanks in advance.

function menu () {
    var choice = prompt("0. Exit \n\n1. Fahrenheit to Celsius \n2. Celsius to Fahrenheit \n3. Guess a number");
    choice = parseInt(choice);

    if (choice > 4 || choice < 0) {
        alert("FEL!!");
    } else if (isNaN(choice)) {
        alert("Måste vara en siffra");
    }
    switch (choice) {
        case 0:
           choice = false;
            break;
        case 1:
            CelsiusToFarenheit();
            break;
        case 2:
            FahrenheitToCelsius();
            break;
        case 3:
            Guess();
            break;
    }
    return choice;
}

do {
    menu();
} while(choice == true);

Answer 1

you forgot to store the variable returned by the menu() function :

function menu () {
    var choice = prompt("0. Exit \n\n1. Fahrenheit to Celsius \n2. Celsius to Fahrenheit \n3. Guess a number");
    choice = parseInt(choice);

    if (choice > 4 || choice < 0) {
        alert("FEL!!");
    } else if (isNaN(choice)) {
        alert("Måste vara en siffra");
    }
    switch (choice) {
        case 0:
           choice = false;
            break;
        case 1:
            CelsiusToFarenheit();
            break;
        case 2:
            FahrenheitToCelsius();
            break;
        case 3:
            Guess();
            break;
    }
    return choice;
}

var choice;
do {
    choice = menu();
} while(choice == true);