Javascript String toProperCase()

//allows proper-casing for strings
String.prototype.toProperCase = function()
{
  return this.toLowerCase().replace(/^(.)|\s(.)/g, function($1) { return $1.toUpperCase(); });
}

// http://stackoverflow.com/a/5574446/98600
String.prototype.toProperCase = function () {
    return this.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
};

String.prototype.toProperCase = function () {
  return this.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
};

String.prototype.toProperCase = function() {
  return this.charAt(0).toUpperCase() + this.substr(1);
}

module.exports = String.prototype;

String.prototype.toProperCase = function () {
  return this.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
};

function titleCase(str) {
 var newWord;/*w ww.j av  a 2s .c om*/
 var newList=[];
 var newString;
 wordList = str.toLowerCase().split(" ");
 for (var word in wordList) {
  var firstLetter = wordList[word].charAt(0).toUpperCase();
  var slicedWord =  wordList[word].slice(1);
  newWord = firstLetter.concat(slicedWord);
  newList.push(newWord);

 } 
 return newList.join(" ");
}



console.log(titleCase("I'm a little tea pot"));
// functional programming solution
String.prototype.toProperCase = function () {
    return this.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
};

// Util function to convert string to Title Case
String.prototype.toProperCase = function () {
  return this.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
};