From the MDN docs for the standard setPrototypeOf function  as well as the non-standard  __proto__ property:     Mutating the [[Prototype]] of an object, no matter how this is accomplished, is strongly discouraged, because it is very slow and unavo...

MDN has a huge scary warning about modifying the prototype in your code:      Changing the [[Prototype]] of an object is, by the nature of how   modern JavaScript engines optimize property accesses, a very slow   operation, in every browser and JavaS...

Hi experts here is my code and I'm stuck how this keyword is adding property to a object.  function carMaker(){  this.companyName='Lamborghini';   }  let LamborghiniUrus = new carMaker();  carMaker.prototype.country="Italy"  Lambo...

I have got the following prototype chain   SuperSuperClass  SuperClass  Class     each with a method named do.  What is the common approach for calling the respective super class method? For the moment I use <ClassName>.prototype.__proto__.<...

Why do we have 2 class Object and again Object in prototype chain of window?  window --> DOMWindow --->Object --->Object ---> null  Can anyone please give me some point about this design?  Follwing is the output on chrome....

Can I enforce that the prototype of an object not be changed?  Note! There are some requirements:   The object should behave just like a regular object literal (add/remove/configure/modify properties and descriptors on the object), with literally the...

When I execute this in Node 4, the last statement evaluates to true, however in Node 6 it evaluates to false.  Why?  F = () => {}; F.prototype = {}; Object.create(F.prototype) instanceof F;...

A project I'm working on currently has called for an object type Chain that itself produces a type of object Link that only it uses. In previous projects, I had nested the object constructor and prototype of Link inside the constructor for Chain,...

Several days ago,I post a question here about class inheritance   Then someone provide a link-- a clever script for class inheritance by John Resig.  Then I try to use this script.  But I found that object created by this script will have a very deep...

I'm reading a great book called 'Javascript Enlightenment' by Cody Lindley.  In the chapter that covers the prototype property it discusses how a function instance is always given a prototype property...easy enough to understand. The bold...