Longest Word in Dictionary through Deleting LeetCode solution in JavaScript

1
/**
2
 * @param {string} s
3
 * @param {string[]} dictionary
4
 * @return {string}
5
 */
6
var findLongestWord = function (s, dictionary) {
7
  const getLen = (s1, s2) => {
8
    let i = 0,
9
      j = 0;
10
    while (i < s1.length && j < s2.length) {
11
      if (s1[i] == s2[j]) {
12
        i++, j++;
13
      } else i++;
14
    }
15
    if (j != s2.length) return 0;
16
    return s2.length;
17
  };
18
  let ans = "",
19
    ml = 0;
20
  for (let word of dictionary) {
21
    const len = getLen(s, word);
22
    if (len > ml) {
23
      ans = word;
24
      ml = len;
25
    } else if (len == ml && ans > word) {
26
      ans = word;
27
    }
28
  }
29
  return ans;
30
};