1
var reverseWords = function (s) {
2
  let chars = [...s];
3
  let start = 0;
4

5
  for (let i = 0; i < chars.length; i++) {
6
    if (chars[i] === " " || i === chars.length - 1) {
7
      let end = i === chars.length - 1 && chars[i] !== " " ? i + 1 : i;
8
      while (start < end) {
9
        [chars[start], chars[end - 1]] = [chars[end - 1], chars[start]];
10
        start++;
11
        end--;
12
      }
13
      start = i + 1;
14
    }
15
  }
16

17
  return chars.join("");
18
};