Simple TitleCase

titleCase.js

function titleCase(str) {
  var workArr = str.split(" ");  
  
  for (var i = 0; i < workArr.length; i++) {
    workArr[i] = workArr[i][0].toUpperCase() + workArr[i].substring(1).toLowerCase();
  }  
  
  return workArr.join(" ");
}

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