Count the Hidden Sequences LeetCode solution in JavaScript

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var numberOfArrays = function (differences, lower, upper) {
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  let temp = 0;
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  let res = 0;
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  let n = lower;
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  for (let i = 0; i < differences.length; i++) {
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    temp += differences[i];
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    differences[i] = temp;
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  }
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  const min = Math.min(...differences);
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  const max = Math.max(...differences);
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  while (n <= upper) {
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    if (n + min >= lower && n + max <= upper) res++;
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    n++;
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  }
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  return res;
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};