class incommon{ $(name){ return document.querySelector(name); } _(name){ return document.querySelectorAll(name); } customMethods(){ Element.prototype.add=function(name){ this.classList.add(name) } Element.prototype.remove=function(name){ this.classList.remove(name) } Element.prototype.none = function() { this.style.display = "none" } Element.prototype.show = function() { this.style.display = "block" } } getRandom(min, max) { const floatRandom = Math.random() const difference = max - min const random = Math.round(difference * floatRandom) const randomWithinRange = random + min return randomWithinRange } } let { $, _ ,customMethods,getRandom} = new incommon() customMethods()