I don’t do JavaScript much yet have to write a WebExtension and soon after starting I found that OOP in JavaScript is very different form other language. So after few hours of search and study I came up with the following solution for achieving polymorphism in JavaScript.

var TClassAbs = function() {     this.showId = function() {         throw "Not Implemented";     }; }   var TClass = function() {     this.showId = function() {         console.log(1);     }; }; TClass.prototype = new TClassAbs(); TClass.prototype.constructor = TClass;   var TClassEx = function() {     var _this = this;     var _parent = Object.getPrototypeOf(this);      this.showId = function() {         _parent.showId();         console.log("A");     }; }; TClassEx.prototype = new TClass(); TClassEx.prototype.constructor = TClassEx;   var tObj = new TClassEx(); tObj.showId(); console.log(tObj); 

Now, my question here:

1. If the way I am inheriting is OK to use in production code?
2. If the way I am accessing ‘parent object’ is OK to use in production code?
3. If the way I am accessing ‘private member’ is bad?

And, I would also very much like to see possible improvement. Thanks.