Minimum Length of String After Deleting Similar Ends LeetCode solution in JavaScript

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var minimumLength = function (s) {
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  const n = s.length;
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  let left = 0;
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  let right = n - 1;
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  while (left < right) {
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    if (s.charAt(left) != s.charAt(right)) break;
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    left++;
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    right--;
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    while (left <= right && s.charAt(left - 1) == s.charAt(left)) left++;
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    while (left <= right && s.charAt(right) == s.charAt(right + 1)) right--;
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  }
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  return right - left + 1;
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};