Coin problem

coins.js

function makeChange(coins, counts, startIndex, totalAmount) {
  if (startIndex >= coins.length) {
    let combinations = [];
    for (let i = 0; i < coins.length; i++) {
      combinations = [...combinations, ...Array(counts[i]).fill(coins[i])];
    }
    console.log(combinations);
  } else if (startIndex === coins.length - 1) {
    if (totalAmount % coins[startIndex] === 0) {
      counts[startIndex] = totalAmount / coins[startIndex];
      makeChange(coins, counts, startIndex + 1, 0);
    }
  } else {
    for (let i = 0; i <= totalAmount / coins[startIndex]; i++) {
      counts[startIndex] = i;
      makeChange(coins, counts, startIndex + 1, totalAmount - coins[startIndex] * i);
    }
  }
}

const coins = [1, 2, 3];
const counts = Array(coins.length);
makeChange(coins, counts, 0, 5);