JavaScript Class-Based Object-Oriented Programming (OOP)

Object-oriented programming

Object-oriented programming (OOP) is a programming paradigm fundamental to many programming languages, including Java and C++. In this article, we'll provide an overview of the basic concepts of OOP. We'll describe three main concepts: classes and instances, inheritance, and encapsulation. For now, we'll describe these concepts without reference to JavaScript in particular, so all the examples are given in pseudocode.

Note: To be precise, the features described here are of a particular style of OOP called class-based or "classical" OOP. When people talk about OOP, this is generally the type that they mean.

After that, in JavaScript, we'll look at how constructors and the prototype chain relate to these OOP concepts, and how they differ. In the next article, we'll look at some additional features of JavaScript that make it easier to implement object-oriented programs.

Object-oriented programming is about modeling a system as a collection of objects, where each object represents some particular aspect of the system. Objects contain both functions (or methods) and data. An object provides a public interface to other code that wants to use it but maintains its own private, internal state; other parts of the system don't have to care about what is going on inside the object.

Source: Mozilla, https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Object-oriented_programming
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