Makeshift Jquery to practice chain functions

//My makeshift Jquery for some reason

var $ = function(selector) {
  var el;

  var obj = {
    getEl(selector) {
      if (el) return el;
      return document.querySelector(selector);
    },
    addClass(className) {
      el.classList.add(className);
      return this;
    },
    removeClass(className) {
      el.classList.remove(className);
      return this;
    },
    append(b) {
 var newcontent = document.createElement('div');
    newcontent.innerHTML = b;

    while (newcontent.firstChild) {
        el.appendChild(newcontent.firstChild);
    }
},

    remove() {
    // Removes an element from the document
     el.parentNode.removeChild(el);
},

   before(c) {
var parent = el.parentNode;
var helper = document.createElement('div');
helper.innerHTML = c;
while (helper.firstChild) {
    parent.insertBefore(helper.firstChild, el);
}},

   after(d) {
var parent = el.parentNode;
var helper = document.createElement('div');
helper.innerHTML = d;
while (helper.firstChild) {
    parent.insertBefore(helper.firstChild, el.nextSibling);
}}



  };

  el = obj.getEl(selector);
  return obj;
};