Nodejs Utililty Methods String Title Case

String.prototype.cleanTitle = function() {
  var title = this.trim().replaceHtmlEntites();
  title = encodeURI(title);
  return title.replace(/&/g, '%26').replace(/#/g, '%23');
};

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

String.prototype.title = function() {
  return this.charAt(0).toUpperCase() + this.slice(1);
};
module.exports = String;

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

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

function titleCase(str) {
  var arr = str.split(" ");
  var combineArr = [];
  var resultArr = [];
  for(var i = 0; i<arr.length; i++){
    var upperArr = [];
    var lowerArr = [];  
    for(var j = 0; j < arr[i].length; j++){      
      if(j === 0){
...

function titleCase(str) {
  var arr = str.split(" ");
  var first;
  var ends = [];
  var temp;
  var arrFixed = [];
  for (i = 0; i < arr.length; i++){
    first = [];
    ends = [];
...

function titleCase(str) {
  var splitted = str.toLowerCase().split(' ');
  for (var i = 0; i < splitted.length; i++) {
    var holder = splitted[i];    
    var bigLetter = holder.charAt(0).toUpperCase();
    holder = holder.slice(1, holder.length);
    splitted[i] = bigLetter.concat(holder);
  str = splitted.join(' ');
...

function titleCase(str) {
    var newTitle = str.split(' ');
    var updateTitle = [];
    for (var st in newTitle) {
        updateTitle[st] = newTitle[st]
            .toLowerCase()
            .replaceAt(0, newTitle[st].charAt(0).toUpperCase());
    return updateTitle.join(' ');
...

String.prototype.title_case = function () {
  var words = this.split(' ');
  var word = '';
  if (words.length > 1) {
    for (var i=0; i < words.length; i++) {
      if (words[i] != 'of' && words[i] != 'the' || i === 0){
        word = word.concat( words[i].charAt(0)
        .toUpperCase() + words[i].slice(1) + ' ');
      else {
        word = word.concat( words[i] + ' ');
    return word.trim();
  else {
    return this.charAt(0).toUpperCase() + this.slice(1);
};