How does prototypal inheritance work in JavaScript?

Question

Ravi Vishwakarma · Answer

In JavaScript, objects can inherit properties from other objects via the prototype chain. Each object has a prototype, and if a property is not found on the object itself, JavaScript will look up the prototype chain to find it.
Checking the Prototype Chain: You can check an object's prototype using:
Object.getPrototypeOf(obj): Returns the prototype of obj.obj.__proto__: Accesses the prototype of obj (non-standard, should be avoided in favor of
Object.getPrototypeOf).instanceof: Checks if an object is an instance of a constructor function.
console.log(Object.getPrototypeOf(child) === parent); // true
console.log(child.__proto__ === parent); // true (non-standard way)
console.log(child instanceof Parent); // true (if using constructor function or class)
Prototypal inheritance provides a flexible and dynamic way to share properties and methods among objects in JavaScript, leveraging the prototype chain to enable reusability and efficient property lookup.

interview

How does prototypal inheritance work in JavaScript?

Ravi Vishwakarma

Can you answer this question?

1 Answers

Liked By