Nodejs Utililty Methods String Camel Case

String.prototype.camelTo_ = function () {
    "use strict";
    return (this.replace(/\W+/g, '_')
        .replace(/([a-z\d])([A-Z])/g, '$1_$2')).toLowerCase();
};

String.prototype.camelcase = function() {
  return this.split("_").map(function(e) {
    return e.replace(/^([a-z])/g, function($1) {
      return $1.toUpperCase();
    });
  }).join("");
};

String.prototype.camelcase = function() {
  return this.replace(/_/g, ' ').replace(/(?:^\w|[A-Z]|\b\w|\s+|_+)/g, function(match, index) {
    if (+match === 0) {
      return "";
    return match.toUpperCase();
  });
};

String.prototype.camelcase = function() {
    var result = "";
    var prevChar = undefined;
    for (var i = 0; i < this.length; i++){
        var currentChar = this.charAt(i);
        if (i == 0 || prevChar == " ") {
            result += currentChar.toUpperCase();
        } else {
            result += currentChar;
...

String.prototype.camelcase = function()
    var result ="";
    var prevchar = undefined;
    for (var i = 0; i < this.length; i ++)
        var currentChar = this.charAt(i);
        if (i == 0 || prevchar == " ")
            result += currentChar.toUpperCase();
        else
            result += currentChar;
        prevchar = currentChar;
    return result;
};
module.exports = String;

String.prototype.camelcase = function() {
    return this.replace(/[^a-zA-Z0-9 ]+/g, ' ').capitalize(true).remove(/ +/g)
  };
String.prototype.digits = function() { return this.remove(/[^\d]/g) }

String.prototype.camelize = function () {
  return this.replace (/(?:^|[_-])(\w)/g, function (_, c) {
    return c ? c.toUpperCase () : '';
  });

'use strict';
String.prototype.camelize = function () {
  return this.replace(/(?:^\w|[A-Z]|\b\w|\s+)/g, function (match, index) {
    if (+match === 0) {
      return '';
    return index === 0 ? match.toLowerCase() : match.toUpperCase();
  });
};
...

String.prototype.camelize = function() {
  var parts = this.split('-'), len = parts.length;
  if (len == 1) return parts[0];
  var camelized = this.charAt(0) == '-'
    ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
    : parts[0];
  for (var i = 1; i < len; i++)
    camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
  return camelized;
...

String.prototype.camelize = function() {
  return this.replace(/-+(.)?/g, function(match, chr) {
    return chr ? chr.toUpperCase() : '';
  });
};