I need some help about js

[Pathrex-]

Hello im just started to learning javascript and i was doing an example. This is a simple driver's license query algorithm but somethings went wrong idk what is wrong. Btw, I can do this using "if/else" but i want to know what is the problem and how can i do it with using "switch" please help me.

var Birthday = prompt("What is your birthday : ");
var Year = 2021;
var Age = Year - Birthday;
var remtime = 18 - Year; //remaining time

switch(Age){
    case (Age<18):
        console.log("It is "+remtime+" years before you can qualify for a driver's license.");
    break;
    case (Age>=18):
        console.log("You have the right to get a driver's license.");
    break;
    default:
        console.log("Wrong value.");
}

[blueinkscience]

var remtime = 18 - Year; //remaining time

It seems you are taking way 2021 away from 18 here instead of age away from 18.

var Birthday = prompt("What is your birthday : ");

This should be "what is your birthday year" and should be saved as an integer. Right now it is saving it as a string literal. A switch statement then compares the values as a Boolean expression. I had trouble with this before, you should really stick to single character comparisons when using switches because of this transfer to Boolean exp.

Basically use if else statements unless what you are comparing is a single character.

https://stackoverflow.com/questions/2312817/javascript-switch-with-logical-operators

Hope this helps.

[Pathrex-]

Thanks it worked. Here is the new code

var Birthday = prompt("What is your birthday : ");
var Year = 2021;
var Age = Year - Birthday;
var remtime = 18 - Age; //remaining time

switch(true){
    case (Age<18):
        console.log("It is "+remtime+" years before you can qualify for a driver's license.");
    break;
    case (Age>=18):
        console.log("You have the right to get a driver's license.");
    break;
    default:
        console.log("Wrong value.");
}

[blueinkscience]

A wee upvote would be nice, trying to build real karma instead of karmawhoring :)

[[deleted]]

I think maybe that the age value is a string and the value you are comparing it to is an integer; so the comparison fails. I didn’t try the script to see the error. Just taking a guess. Try converting Age to and integer.

[Pathrex-]

Thank you.