Maximize the Confusion of an Exam LeetCode solution in JavaScript

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var maxConsecutiveAnswers = function (answerKey, k) {
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  let [left, right, numOfTrue, numOfFalse, max] = new Array(5).fill(0);
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  const moreChanges = () => numOfTrue > k && numOfFalse > k;
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  while (right < answerKey.length) {
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    if (answerKey[right] === "T") numOfTrue++;
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    if (answerKey[right] === "F") numOfFalse++;
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    while (moreChanges()) {
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      if (answerKey[left] === "T") numOfTrue--;
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      if (answerKey[left] === "F") numOfFalse--;
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      left++;
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    }
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    max = Math.max(max, right - left + 1);
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    right++;
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  }
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  return max;
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};