Average Salary Excluding the Minimum and Maximum Salary LeetCode solution in JavaScript

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var average = function (salary) {
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  let max = salary[0],
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    min = salary[salary.length - 1],
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    sum = 0;
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  for (let i = 0; i < salary.length; i++) {
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    if (salary[i] > max) {
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      max = salary[i];
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    } else if (salary[i] < min) {
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      min = salary[i];
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    }
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    sum += salary[i];
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  }
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  return (sum - min - max) / (salary.length - 2);
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};