In JavaScript, Object inherits properties through the prototype chain. Example : // Parent Function function Person(name, age) { this.name = name; }; Person.prototype.hello = function() { console....

I have a number of classes all implementing the same interface. In order to create instances of these classes one should not use the constructor but rather a number of static methods which take a ...

I know there have been a lot of questions about module patterns, prototypical inheritance, ES6 classes, etc with excellent answers. This is not about discussing different patterns or the bad sides of ...

I'm learning TypeScript about extending the interface. I unintentionally recognized that TypeScript allows extending interface from multiple classes. That made me surprised and I have researched a lot ...

I have standard handlers for the click, input and change events of my customized HtmlInputElement. I want to define these handlers like this: class MyInputElement extends HTMLInputElement { ...

I have 2 "classes": const Person = function(firstName, birthYear){ this.firstName = firstName; this.birthYear = birthYear; } Person.prototype.sayHi = function(){ console.log('Hi!'); } ...

Is there a static equivalent of instanceof? I.E., rather than: obj1 instanceof Type something like: TypeA instanceof TypeB? I couldn't find anything on the matter, so I hacked together this: function ...

function Animal(name) { this.name = name; } Animal.prototype.printName = function() { console.log(`my name is ${this.name}`) } function Dog(name) { Animal.call(this, name); this.speak =...

So I tested this code: class C1 {} C1.prototype. f =function(){ return 1 } class C2 extends C1 {} C2.prototype. f =function(){ return super.f()+1 } And it throws a syntax error: 'super' keyword ...

The source object that printing the prototype chain can be various: [1, 2, 3] // array literal {a: 1} // object literal new Set() // built-in set new Promise( () =>{} ) // built-in Promise ...

I'm trying to implement a class for a matrix with all the usual operations, just as an exercise. I implemented the common operations (+, -, ·) but my problem came when I tried to implement slicing ...

I'm using a derived class from a base class using templates. I have something like: #include <iostream> using namespace std; template <typename T> class BaseClass { public: ...

I have a simple piece of JavaScript code creating object b using Object.create and passing object a as the argument: const a = {}; const b = Object.create(a); console.log(b); It is my understanding ...

I have a following code: const myFunc = () => { let var1, var2, var3; const setVar1 = (val) => { var1 = val } return { setVar1 } } Can you please tell me how this pattern is ...

This isn't so much a problem I'm having, rather than a general question about how classes/prototypes work in JS vs using closures. Lets say I have the following class (I'm going to omit the full body'...