Witam, nie wiem co tu jest nie tak:
const howMany = prompt('how many cases?');
for (i = 0; i < howMany; i++) {
let counter = 0;
let number = prompt('give number');
let otherNumber = number.split("").reverse().join("");
while (number != otherNumber) {
number += otherNumber;
counter++;
}
console.log(number + ' ' + counter)
}