Let’s learn how to implement all OOP principles in TypeScript.
- Classes & Objects
- Encapsulation
- Abstraction & Interface
- Inheritance
- Polymorphism
Class and Object
A class is a blueprint, and objects are instances of the class.
Encapsulation
Encapsulation = hide internal data, expose only what is needed.
Use private, protected, and public.
Abstraction
Abstraction = hide complexity and expose only what the user needs.
Use abstract classes or interfaces. Interfaces define shape, and classes can implement them.
You cannot create an object from it, but it can have abstract methods (no body) and normal methods. The child must implement (override) the abstract method.
A class can implement multiple interfaces. But a class can extend only one class
Interfaces do NOT contain implementation. Classes must provide the implementation
Inheritance
A class can inherit methods or data from another class.
Polymorphism
Polymorphism = same method name, different behavior.
Full Example Code:
https://snipsave.com/view-snippet?user=khafidoilzam&snippet_id=Fp13KgLloQpTnToegf
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