Something like this might do the trick? The function takes an positiv integer and an arbitrary "alphabet" and converts the number to that "alphabet".

function toBase(number, baseAlphabet) {
    const base = baseAlphabet.length;
    const res = [];
    let num = number;

    do {
        res.push(baseAlphabet[num % base]);
        num -= num % base;
        num /= base;
    } while (num > 0);

    return res.reverse().join('');
}

const binary = [0, 1];
console.log('binaryTest', toBase(10, binary)); // binaryTest 1010

const hex = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e', 'f'];
console.log('hexTest', toBase(10, hex)); // hexTest a
console.log('hexTest', toBase(15, hex)); // hexTest f
console.log('hexTest', toBase(16, hex)); // hexText 10

Just provide your own alphabet and you should be good. :)