Maximum Number of Weeks for Which You Can Work LeetCode solution in JavaScript

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var numberOfWeeks = function (milestones) {
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  let maxElement = 0,
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    arraySum = 0;
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  for (let milestone of milestones) {
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    arraySum += milestone;
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    maxElement = Math.max(maxElement, milestone);
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  }
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  let rest = arraySum - maxElement;
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  let difference = maxElement - rest;
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  if (difference <= 1) return arraySum;
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  return arraySum - difference + 1;
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};