Form Largest Integer With Digits That Add up to Target LeetCode solution in JavaScript

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var largestNumber = function (cost, target) {
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  const arr = new Array(target + 1).fill("#");
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  arr[0] = "";
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  for (let i = 0; i < 9; i++) {
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    for (let j = cost[i]; j <= target; j++) {
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      if (
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        arr[j - cost[i]] !== "#" &&
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        arr[j - cost[i]].length + 1 >= arr[j].length
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      ) {
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        arr[j] = (i + 1).toString().concat(arr[j - cost[i]]);
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      }
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    }
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  }
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  return arr[target] == "#" ? "0" : arr[target];
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};