Nodejs Utililty Methods String Camel Case

String.prototype._ToCamel = function () {
    "use strict";
    return this.replace(/_([a-z])/g, function (m, w) {
        return w.toUpperCase();
    });
};

String.prototype.camel2human = function () {
    var regex = /([A-Z])/g;
    var str = this.replace(regex, " $1");
    str = str[0].toUpperCase() + str.slice(1).toLowerCase();
    return str;

String.prototype.camelCase = function(){ 
  return this.split(' ').map( function(x){ 
    return x.replace(/\b\w/g, l => l.toUpperCase()); } ).join(''); 

String.prototype.camelCase = function(){
  return this.split(' ').map((word) => (word[0] || '').toUpperCase() + word.slice(1)).join('');
console.log("hello case".camelCase());

'use strict';
String.prototype.camelCase = function () {
  return this.toString().split(' ').map(function(word){
     return word.charAt(0).toUpperCase() + word.slice(1);
   }).join('');
console.log("sad sdsd".camelCase());

String.prototype.camelCase=function(){
  var x = this;
  var res = x.split(' ');
  var d = "";
  for(var i = 0; i < res.length; ++i) {
    if (res[i].length > 0) {
      res[i] = res[i][0].toUpperCase() + res[i].slice(1)
      d = d + res[i];
  return d;

String.prototype.camelCase = function() { 
    return this.toLowerCase().replace(/[_-](.)/g, function(match, group1) {
        return group1.toUpperCase();
    });

String.prototype.camelCase = function() {
  return this.replace( /(\_[a-z])/g, function( $1 ) {return $1.toUpperCase().replace( "_", "" );} );
};

String.prototype.camelCase = function() {
    return this
        .replace(/\s(.)/g, function($1) { return $1.toUpperCase(); })
        .replace(/\s/g, '')
        .replace(/^(.)/, function($1) { return $1.toLowerCase(); });

String.prototype.camelCase=function(){
    var a = this.split(' ');
    return a.map(function(val){
      return val.replace(/^[a-z]/, camelCaseFirstLetter);
    }).join('');
function camelCaseFirstLetter(a){
  return a.toUpperCase();