LeetCode: Remove All Adjacent Duplicates In String II Solution

1/**
2 * @param {string} s
3 * @param {number} k
4 * @return {string}
5 */
6var removeDuplicates = function (s, k) {
7  const stack = []
8  for (let i = 0; i < s.length; i++) {
9    if (s[i] !== s[i - 1]) {
10      stack.push(1)
11    } else {
12      stack[stack.length - 1]++
13      if (stack[stack.length - 1] === k) {
14        stack.pop()
15        s = s.substring(0, i - k + 1) + s.substring(i + 1)
16        i -= k
17      }
18    }
19  }
20  return s
21}