Object Oriented Programming using Typescript

TypeScript is a statically typed superset of JavaScript that introduces optional static typing to the language. One of the key features of TypeScript is its support for Object-Oriented Programming (OOP) principles. In TypeScript, classes serve as the foundation for creating objects and encapsulating related functionality. Developers can define classes with properties, methods, and constructors, allowing for the creation of instances that represent specific entities or concepts within a program.

Key Pillars of Object-Oriented Programming

  1. Encapsulation: Grouping data and methods within a class, restricting direct access to some elements and providing controlled access through methods.
  2. Abstraction: Hiding internal implementation details of a class, only exposing essential functionalities through methods.
  3. Inheritance: Allows new classes to inherit properties and methods from existing classes, promoting code reuse and specialization.
  4. Polymorphism: Ability of different objects to respond to the same message (method call) in different ways based on their type.


Encapsulation is a fundamental OOP concept in TypeScript, and it involves bundling the data (properties) and methods that operate on the data within a class. This helps in organizing code and prevents direct access to internal details from outside the class. Inheritance is another important aspect of TypeScript's OOP capabilities, enabling the creation of new classes that inherit properties and methods from existing ones. This promotes code reuse and the establishment of hierarchies among classes.


Polymorphism, the third OOP principle, allows objects to be treated as instances of their base class, even if they are instantiated from derived classes. TypeScript supports polymorphism through interfaces and abstract classes, providing a mechanism for defining common contracts and shared behaviors among classes. Lastly, TypeScript introduces the concept of access modifiers such as public, private, and protected to control the visibility and accessibility of class members. These access modifiers enhance the encapsulation of data and methods, contributing to better code organization and maintenance in large-scale applications. Overall, TypeScript's Object-Oriented Programming capabilities empower developers to create well-structured, modular, and maintainable code.

Additional Features

  1. Access Modifiers: Control access to class members (public, private, protected).
  2. Interfaces: Define contracts for classes, specifying methods and their signatures without implementation details.
  3. Generic Types: Define classes or functions that work with different types of data at runtime.


TypeScript's OOP features significantly enhance development, promoting cleaner, more organized, and easier-to-maintain code. Understanding these core concepts without diving into code specifics lays the foundation for effective OOP practices in TypeScript.