Nodejs Utililty Methods String to Upper Case

String.prototype.toUpperLowerCase = function() {
    var string = this.split("");
    string[0] = string[0].toUpperCase();
    return string.join("");
};
String.prototype.firstUpper = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
};

String.prototype.ucWords = function () {
    return this.split(' ').map(function (w) {
        return w.substr(0, 1).toUpperCase() + w.substr(1); 
    }).join(' ');

String.prototype.uc_words = function(){
    return this.replace( /(^|\s)([a-z])/g , function(m,p1,p2){return p1+p2.toUpperCase();});
};

String.prototype.ucwords = function() {
    return (this + '').replace(/^([a-z])|\s+([a-z])/g, function ($1) {
      return $1.toUpperCase();
  });

String.prototype.ucwords = function () {
  var words = this.split(' ');
  for (var i = 0; i < words.length; i++)
    words[i] = words[i].charAt(0).toUpperCase() + words[i].slice(1);
  return words.join(' ');
};
module.exports = function () {
};

String.prototype.ucwords = function(){
  var arr = this.split(' ');
  var str ='';
  arr.forEach(function(v){
    str += v.charAt(0).toUpperCase()+v.slice(1,v.length)+' ';
  });
  return str;
};

String.prototype.ucwords = function(){
  return this.replace(/(?:^|\s)\S/g,function(v){return v.toUpperCase();});
};

String.prototype.ucwords = function () {
  return this.toLowerCase().replace(/^.|\s\S/g, function (a) {
    return a.toUpperCase();
  });
};

String.prototype.upWord = function (){
  var words = this.split(" ");
  var newWords = words.map(function(elem,index) {
    return (elem[0].toUpperCase() + elem.slice(1));
  })
  return newWords.join(" ");
var str = "the quick fox jump over the lazy dog";
console.log(str.upWord());
...

String.prototype.upcase = function () {
  return this.valueOf().toUpperCase();
};