Find All Numbers Disappeared in an Array LeetCode solution in JavaScript

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var findDisappearedNumbers = function (nums) {
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  let result = [];
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  for (let i = 0; i < nums.length; i++) {
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    let id = Math.abs(nums[i]) - 1;
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    nums[id] = -Math.abs(nums[id]);
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  }
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  for (let i = 0; i < nums.length; i++) {
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    if (nums[i] > 0) result.push(i + 1);
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  }
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  return result;
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};