Nodejs Utililty Methods String Title Case

String.prototype.titleize = function() {
    return this.substring(0,1).toUpperCase() + this.substring(1);

String.prototype.titleize = function() {
    var words = this.split(' ')
    var array = []
    for (var i=0; i<words.length; ++i) {
        array.push(words[i].charAt(0).toUpperCase() + words[i].toLowerCase().slice(1))
    return array.join(' ')

String.prototype.titleize = function() {
  if(this.length === 0) {
    return '';
  } else {
    var words = this.split(' ');
    for(var i=0, len=words.length; i < len; i++) {
      words[i] = words[i].capitalize();
    return words.join(' ');
...

String.prototype.titleize = function() {
    var words = this.replace(/_/g, " ").split(' ')
    var array = []
    for (var i=0; i<words.length; ++i) {
        array.push(words[i].charAt(0).toUpperCase() + words[i].toLowerCase().slice(1))
    return array.join(' ')

String.prototype.titleize = function () {
    var str = this.underscore().humanize();
    str = str.replace(/\s\b[\w]/g, function (chr) {
        return chr.toUpperCase();
    });
    return str;
};

String.prototype.titleize = function(splitter) {
  var words = this.split(splitter ? splitter : ' ')
  var array = []
  for (var i=0; i<words.length; ++i) {
    array.push(words[i].charAt(0).toUpperCase() + words[i].toLowerCase().slice(1))
  return array.join(' ')

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

String.prototype.toTitleCase = function( selector ) {
    var splitArray;
    var finalString = "";
    if ( typeof ( selector ) === 'undefined' ) {
        selector = " ";
        splitArray = this.split ( " " ) ;
    } else {
        splitArray = this.split ( selector ) ;
    splitArray.forEach( function( element ) {
        finalString += element[0].toUpperCase() + element.substr(1) + selector;
    } );
    finalString = finalString.substr( 0, finalString.length-1);
    return finalString;

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

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