Largest Number LeetCode solution in JavaScript

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var largestNumber = function (nums) {
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  var arr = [];
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  nums.forEach((item) => {
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    arr.push(item.toString());
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  });
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  arr.sort((a, b) => (b + a).localeCompare(a + b));
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  var ret = "";
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  if (arr[0] == "0") return "0";
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  arr.forEach((item) => {
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    ret += item;
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  });
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  return ret;
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};