This question already has an answer here:                           Javascript object members that are prototyped as arrays become shared by all class instances                                      3 answers                                     S...

What's the difference between  var A = function () {     this.x = function () {         //do something     }; };   and  var A = function () { }; A.prototype.x = function () {     //do something };...

Trying to bend by head around Javascript's take on OO...and, like many others, running into confusion about the constructor property. In particular, the significance of the constructor property, as I can't seem to make it have any effect. E...

What are the functional differences between the following two Javascript prototypes, and are there any benefits for choosing one over the other?  Option 1:  Person.prototype.sayName = function(name) {    alert(name); }   Option 2:   Person.prototyp...

When ES6 Arrow functions don't seem to work for assigning a function to an object with prototype.object. Consider the following examples:  function Animal(name, type){  this.name = name;   this.type = type;   this.toString = () => `${this.na...

console.log(typeof String.prototype); // object console.log(typeof Number.prototype); // object console.log(typeof Object.prototype); // object console.log(typeof Boolean.prototype); // object  console.log(typeof Function.prototype); // function   Wh...

I'm trying to add a method to the Event prototype. In order to call/set preventDefault() or, in IE-speak returnValue = false and -if desired- stopPropagation() / cancelBubble = true;. I thought the code below would have sufficed.   Event = Event...

As you know we can define getters and setters in JS using defineProperty(). I've been stuck when trying to extend my class using defineProperty().  Here is an example code:  I have an array of fields which must be added to a object  fields = [...

I'm doing a project in Node.js using express. Here's my directory structure:  root |-start.js |-server.js |-lib/ |    api/ |        user_getDetails.js |        user_register.js   The lib/api/ directory has a number of JS files relating to the...

I've:  function Obj1(param) {     this.test1 = param || 1;  }  function Obj2(param, par) {     this.test2 = param;  }   now when I do:  Obj2.prototype = new Obj1(44); var obj = new Obj2(55);  alert(obj.constructor)    I have:  function Obj1(param...