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...

Google JavaScript Style Guide advises against extending the Array.prototype. However, I used Array.prototype.filter = Array.prototype.filter || function(...) {...} as a way to have it (and similar methods) in browsers where they do not exist. MDN a...

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...

How can the the top-most scope can be cached in order to be used deeper in the prototype later, like so:  var Game = function(id){    this.id = id; };  Game.prototype = {   board : {     init: function(){        // obviously "this" isn'...

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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...