Every component in JavaScript is an Object, including Functions, Strings, and Numbers.
Uses object literals or constructor functions to create objects
Uses prototype inheritance
Function in Javascript
In Javascript, functions double as constructors. You call a function as a constructor by using the new operator.
Javascript Prototype
Advantage of using the prototype object to add functions
No matter how many objects you create, functions are loaded only once into memory
Allows you to override function if required
Encapsulation
Concept: enclosing all the functionalities of an object within that object.
Then we can instantiate an instance of User using User constructor.
Inheritance
In JavaScript, we don't have the concept of class, so inheritance in JavaScript is prototype based. This means to implement inheritance in JavaScript, an object inherits from another object.
Polymorphism
The ability to redefine methods for derived classes.
