function toFirstUpper(word){
      return word.substring(0,1).toUpperCase()+word.substring(1).toLowerCase();
}
function titleCase(str) {
    var wordArr=str.split(" ");
    for (var i=0; i<wordArr.length; i++){
        wordArr[i]=toFirstUpper(wordArr[i]);
    }
    str=wordArr.join(" ");
    return str;
}
titleCase("I'm a little tea pot");
titleCase("sHoRt AnD sToUt");
titleCase("HERE IS MY HANDLE HERE IS MY SPOUT");