How to title case in JavaScript

Using Array split() join() to title case in JavaScript

function capitalizeEachWord(sentence) {

  const words = sentence.toLowerCase().split(" ");

  for (let i = 0; i < words.length; i++) {
    words[i] = words[i][0].toUpperCase() + words[i].substr(1);
  }

  var joined = words.join(" ");
  return joined;
}
Code language: JavaScript (javascript)

Using Regex

const sentence = "how to capitalize the first letter";
sentence.toLowerCase().replace(/(^\w{1})|(\s+\w{1})/g, letter => letter.toUpperCase());
Code language: JavaScript (javascript)