The freeCodeCamp Title Case challenge - my solution(s)

FCC-TitleCase

// revised to use .map and some ES6
function titleCase(str){
  return str
    .toLowerCase()
    .split(' ')
    .map( w => w[0].toUpperCase() + w.slice(1) )
    .join(' ');
}


function ORIGINAL_titleCase(str) {
  var splitStr = str.split(' '),
      splitLen = splitStr.length,
      i;
  for (i = 0; i < splitLen; i++) {
    splitStr[i] = splitStr[i].toLowerCase().replace(/^\w/, splitStr[i].charAt(0).toUpperCase());
  }
  return splitStr.join(' ');
}

titleCase("I'm a little tea pot");