Nodejs Utililty Methods String Camel Case

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

String.prototype.camelize = function() {
  var s = 'x_' + this.trim().toLowerCase();
  s = s.replace(/[\s_]/g, ' ');
  s = s.replace(/^(.)|\s(.)/g, function($1) {
    return $1.toUpperCase();
  });
  return s.replace(/ /g, '').substr(1);

String.prototype.camelize = function () {
    return this.replace(/^-ms-/, 'ms-').replace(/-([a-z]|[0-9])/ig, function (a, l) {
        return (l + '').toUpperCase();
    });
}; 

String.prototype.camelize = function(index)
  var parts = this.split(/[-_]/);
  var str = '';
  if (typeof index == 'undefined') {
    index = 1;
  for (var i=0; i<index; i++) {
    str += parts[i];
...

String.prototype.camelize = function (lower_case_and_underscored_word) {
    var parts = this.split('_'), str = "";
    if (lower_case_and_underscored_word === 'lower') {
        str = parts.shift();
    for (var i = 0, len = parts.length; i < len; i++) {
        str += parts[i].capitalize();
    return str;
...

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

String.prototype.dashToCamel = function(str) {
    if(str == undefined) {
        str = this;
    return str.replace(/\-+(.)/g, function (x, chr) {
        return chr.toUpperCase();
    });

String.prototype.decamel = function() {
    return this.replace(/[A-Z][a-z_-]*/g, function(txt) {
        return txt + ' ';
    }).trim();
};

String.prototype.decamelize = function() {
  return this.replace(/[A-Z]/g, ' $&').toLowerCase().capitalize();
};

String.prototype.spineCaseToCamelCase = function() {
    var input = this;
    var output = "";
    var trimmedInput = input.trim();
    var firstLetter = trimmedInput.substring(0, 1).toLowerCase();
    var afterFirstLetter = trimmedInput.substring(1);
    var camelCased = afterFirstLetter.replace(/-([a-z])/g, function (g) { return g[1].toUpperCase(); }).replace(/ ([a-z])/g, function (g) { return g[1].toUpperCase(); });
    var camelNoExtraDashesOrWhite = camelCased.replace(/[-]/g, "").replace(/\s/g, "");
    output = firstLetter + camelNoExtraDashesOrWhite;
...