Maximum Swap LeetCode solution in JavaScript

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var maximumSwap = function (num) {
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  const nums = `${num}`.split("");
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  for (let index = 0; index < nums.length - 1; index++) {
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    const current = nums[index];
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    const diff = nums.slice(index + 1);
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    const max = Math.max(...diff);
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    if (current >= max) continue;
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    const swapIndex = index + diff.lastIndexOf(`${max}`) + 1;
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    [nums[index], nums[swapIndex]] = [nums[swapIndex], nums[index]];
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    break;
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  }
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  return nums.join("");
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};