uppercase first letter of each word in a string

upperCaseFirstLetter.js

function titleCase(str) {
  //split to array of words
  let wordArr = str.split(' ');
  let newArr = [];

  wordArr.forEach(function(e){
    e = e.toLowerCase();
    e = e.replace(e[0], e[0].toUpperCase());
    newArr.push(e);
  })
  
  newArr = newArr.join(' ');
  console.log(newArr);

  return newArr;

}