Maximize Distance to Closest Person LeetCode solution in JavaScript

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/**
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 * @param {number[]} seats
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 * @return {number}
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 */
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var maxDistToClosest = function (seats) {
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  let arr = seats.join("").split("1");
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  for (let i = 0; i < arr.length; i++) {
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    if (arr[i] == "") arr[i] = 0;
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    else {
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      let middle = true;
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      if (i == 0 || i == arr.length - 1) {
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        arr[i] = arr[i].length;
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      } else {
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        arr[i] = Math.ceil(arr[i].length / 2);
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      }
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    }
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  }
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  return arr.sort((a, b) => (a >= b ? -1 : 1))[0];
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};