Determine if Two Strings Are Close LeetCode solution in JavaScript

1
var closeStrings = function (word1, word2) {
2
  if (word1.length != word2.length) return false;
3
  let map1 = new Map(),
4
    map2 = new Map(),
5
    freq1 = new Set(),
6
    freq2 = new Set();
7
  for (let i = 0; i < word1.length; i++)
8
    map1.set(word1[i], map1.get(word1[i]) + 1 || 1),
9
      map2.set(word2[i], map2.get(word2[i]) + 1 || 1);
10
  if (map1.size != map2.size) return false;
11
  for (const [key, value] of map1) {
12
    if (!map2.has(key)) return false;
13
    freq1.add(value);
14
    freq2.add(map2.get(key));
15
  }
16
  if (freq1.size != freq2.size) return false;
17
  for (const freq of freq1) if (!freq2.has(freq)) return false;
18
  return true;
19
};