Is JavaScript Object Oriented?

Yes, JavaScript is considered an object-oriented programming (OOP) language, but it has its own unique approach to object-oriented concepts compared to traditional class-based languages like Java or C++. Here's an explanation of how JavaScript is object-oriented:

Objects as Building Blocks

In JavaScript, objects are the fundamental building blocks. Everything in JavaScript is an object or can be represented as an object, such as functions, arrays, and even primitive types like strings and numbers.

Prototypal Inheritance

JavaScript uses prototypal inheritance rather than classical class-based inheritance. This means that objects can inherit properties and methods directly from other objects, referred to as prototypes, rather than through classes. Objects can serve as prototypes for other objects, creating a chain of inheritance.

Constructor Functions

JavaScript uses constructor functions to create objects that share a common structure. However, constructor functions themselves are just regular functions that are invoked with the new keyword. They set up properties and methods for objects created using them.

Dynamic Typing

JavaScript's dynamic typing allows variables to hold values of any type and change types during runtime. This flexibility aligns with object-oriented principles, as objects can encapsulate data and behavior regardless of their specific type.


While JavaScript doesn't provide true private and public access modifiers like some other languages, it does support encapsulation by allowing you to control the visibility of properties and methods. Closures are often used to achieve a level of privacy.


JavaScript supports polymorphism through its flexible data types and function behavior. Functions can accept different types of arguments and behave differently based on those types, allowing for a form of polymorphism.

Object Literal Notation

JavaScript provides a concise way to create objects using object literal notation. This allows you to define objects and their properties directly in your code.

Object Manipulation

Objects in JavaScript can be modified dynamically, allowing you to add, remove, or modify properties and methods at runtime. This aligns with the dynamic nature of object-oriented programming.


JavaScript's object-oriented nature revolves around its use of objects as building blocks, prototypal inheritance, constructor functions, and its ability to support encapsulation, polymorphism, and dynamic typing. While it might differ from classical object-oriented languages, JavaScript's object-oriented features enable developers to write modular and reusable code in an object-oriented style.