Why is the JavaScript not working?

Question

I used to write this code to reverse "a" and "b", and it reverses "a" without any problems, but it cant reverse "b". Can anyone help?

Code:
var a = prompt("Enter your number");
document.write = ("Your number of choise is = " + a);
var A = (a.split('').reverse().join(''));
if (a >= A) {
var b = a - A;
var B=(b.split('').reverse().join(''));
}
else if (A > a) {
var b = A - a;
var B=(b.split('').reverse().join(''));
}
or my full code
https://code.sololearn.com/We0Gf6LZpBL9/?ref=app

Answer 1

https://code.sololearn.com/Wfrx7kxFrLIM/?ref=app

You could use recursion to finish this. Although, a while loop would also suffice.

Update, I added comments, and used better variable names. This is why good variable names and comments are essential to reducing bugs, and increasing maintainability.