captitalize js

1function capitalize2(str) {
2  str = str.toLowerCase();
3
4  const arrOfWords = str.split(" ");
5
6  const arrOfWordsCased = [];
7
8  for (let i = 0; i < arrOfWords.length; i++) {
9    const char = arrOfWords[i].split("");
10    char[0] = char[0].toUpperCase();
11
12    res.push(char.join(""));
13  }
14  return arrOfWordsCased.join(" ");
15}