Uppercase the first letter of each word

toUpperCase.js

function myUpperCase(str) {
  split = str.split(' ');

  for (var i = 0; i < split.length; i++) {
    split[i] = split[i].charAt(0).toUpperCase() + split[i].slice(1);
  }

  capitalizeString = split.join(' ');
  return capitalizeString;
}

myUpperCase("how are you");