interview

Home / DeveloperSection / Interviews / How does prototypal inheritance work in JavaScript?

Ask Question
Ravi Vishwakarma

Ravi Vishwakarma

Follow
Hi, my self Ravi Vishwakarma. I have completed my studies at SPICBB Varanasi. now I completed MCA with 76% form Veer Bahadur Singh Purvanchal University Jaunpur. SWE @ MindStick | Software Engineer | Web Developer | .Net Developer | Web Developer | Backend Engineer | .NET Core Developer

Can you answer this question?

Answer

1 Answers

Ravi Vishwakarma

Ravi Vishwakarma

17-Jun-2024

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.

MindStick Training

Liked By