Largest Odd Number in String LeetCode solution in JavaScript

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var largestOddNumber = function (num) {
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  for (let i = num.length - 1; i >= 0; i--) {
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    // +num[i] converts string into number like parseInt(num[i])
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    if (+num[i] % 2) {
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      return num.slice(0, i + 1);
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    }
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  }
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  return "";
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};