Nodejs Utililty Methods HTML Element Class Remove

Element.prototype.removeClass = function(className) {
  const regex = new RegExp(className, 'g')
  const newClasses = this.className.replace(regex, '')
  this.className = newClasses.trim()
  return this

Element.prototype.removeClass=function(className){
  var classNames=this.className.split(' '),
    newClass='';
  for(var i=0;i<classNames.length;i++){
    if(classNames[i]!==className){
      newClass+=' '+classNames[i];
  return !!(this.className=newClass.trim());
...

Element.prototype.removeClass = function(className){
  this.className = this.className.replace(new RegExp('(^|\\s)' + className + '(?:\\s|$)'), '$1');
  return this;

Element.prototype.removeClass = function(cls) {
  if (this.hasClass(cls)) {
      var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
    this.className=this.className.replace(reg,' ');
};

Element.prototype.removeStyleClass = function(className) {
    if (this.className === className) {
        this.className = "";
        return;
    var regex = new RegExp("(^|\\s+)" + className.escapeForRegExp() + "($|\\s+)");
    if (regex.test(this.className))
        this.className = this.className.replace(regex, " ");
};
...