Nodejs Utililty Methods String Camel Case

String.prototype.toBigCamelCase = function () {
  var sourceStr = this.toString();
  var str = '';
  var strArr = sourceStr.split('-');
  strArr.forEach(function (el) {
    str = str + el.firstUppserCase();
  })
  return str;

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

String.prototype.toCamel = function(){
    return this.replace(/^([A-Z])|\s(\w)/g, function(match, p1, p2, offset) {
        if (p2) return p2.toUpperCase();
        return p1.toLowerCase();        
    });
};

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

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

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

String.prototype.toCamel = function(){
    var re = /(\b[a-z](?!\s))/g;
    return this.toLowerCase().replace(re, function(x){
        return x.toUpperCase();
    });
};
function addClass(el, className) {
    if (el.classList)
        el.classList.add(className)
...

String.prototype.toCamel = function(){
    return this.replace(/(\-[a-z])/g, function($1){return $1.toUpperCase().replace('-','');});
};
String.prototype.toUnderscore = function(){
    return this.replace(/([A-Z])/g, function($1){return "_"+$1.toLowerCase();});
};

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

String.prototype.toCamelCase = function () {
  return this.valueOf().replace(/-([a-z])/g, function (g) { return g[1].toUpperCase(); });