OOP

Object Oriented JavaScript

Object Oriented Programming is a programming paradigm that uses objects and their interactions to design applications and computer programs.

Object

An object is a key having a value. The value can be a primitive data type, a function, or an object. The key is always a string, but the value can be anything.

      
        let person = {
   name: "John",
   age: 30,
   hobbies: ["reading", "music", "movies"],
   greet: function() {
       console.log("Hello, World!");
   }
};

Class

A class is a blueprint for creating objects. It defines the properties and methods that an object can have.

      
        class Person {
   constructor(name, age) {
       this.name = name;
       this.age = age;
   }
   greet() {
       console.log("Hello, World!");
   }
}

Instance

An instance is an object that is created from a class. It has all the properties and methods that were defined in the class.

      
        let person = new Person("John", 30);

Inheritance

Inheritance is a mechanism that allows a class to inherit properties and methods from another class.

      
        class Person {
   constructor(name, age) {
       this.name = name;
       this.age = age;
   }
   greet() {
       console.log("Hello, World!");
   }
}
class Student extends Person {
   constructor(name, age, grade) {
       super(name, age);
       this.grade = grade;
   }
   study() {
       console.log("Studying...");
   }
}