string to title case javascript

1function titleCase(str) {
2    return str
3        .split(' ')
4        .map((word) => word[0].toUpperCase() + word.slice(1).toLowerCase())
5        .join(' ');
6}
7console.log(titleCase("I'm a little tea pot")); // I'm A Little tea Pot
8

1function titleCase(sentence) {
2  let sentence = string.toLowerCase().split(" ");
3  for (let i = 0; i < sentence.length; i++) {
4    sentence[i] = sentence[i][0].toUpperCase() + sentence[i].slice(1);
5  }
6  
7  return sentence.join(" ");
8}
9