JavaScript Algorithms and Data Structures Projects - Roman Numeral Converter

Tell us what’s happening:
I think I have the basic logic of the solution, but the problem is that I cannot seem to find out how to convert the roman numeral array into a string.
It currently returns ['X', 'X', 'X', 'V', 'I']

I tried doing return [].join("") below the base case, and also return rem.join("") at the end of the if statement within the for loop. But I think that is converting the result into a string when it is calling the function back and it says rem.unshift... is not a function
Some guidance would be appreciated. My logic is still very cloudy.

Your code so far

function convertToRoman(num) {
  let romanIndex = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I'];
  let arabicIndex = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1];
  if (num === 0) {
    return [];
  } else {
  for (let i = 0; i < arabicIndex.length; i++) {
    if (num >= arabicIndex[i]) {
       let rem = convertToRoman(num - arabicIndex[i]);
       return rem;
  return "";

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Challenge: JavaScript Algorithms and Data Structures Projects - Roman Numeral Converter

Link to the challenge:

Yes! I realized that rem.join(“”) is returning a string and it was causing problems for the unshift method.
I will try the .concat() approach. Thank you so much for your prompt advice!

My bad. Didn’t know I wasn’t supposed to post solutions in the forum.
Will keep in mind from now on.
I was wondering about result ""; at the end. It seemed like it wasn’t doing anything, but the code passed so I just left it there.
Thanks again for your help.

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