Find Resultant Array After Removing Anagrams LeetCode solution in JavaScript

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var removeAnagrams = function (words) {
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  let n = words.length;
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  for (let i = 0; i < n - 1; i++) {
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    if (isAnagram(words[i], words[i + 1])) {
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      words.splice(i + 1, 1);
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      i--;
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      n--;
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    }
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  }
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  return words;
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};
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function isAnagram(a, b) {
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  let freqArr = new Array(26).fill(0);
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  if (a.length != b.length) return false;
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  for (let i = 0; i < a.length; i++) {
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    let idx1 = a[i].charCodeAt(0) - "a".charCodeAt(0);
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    freqArr[idx1]++;
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    let idx2 = b[i].charCodeAt(0) - "a".charCodeAt(0);
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    freqArr[idx2]--;
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  }
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  for (let i = 0; i < 26; i++) {
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    if (freqArr[i] > 0) {
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      return false;
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    }
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  }
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  return true;
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}