Science Knowings: JavaScript Course For Social Media

Factory Pattern

Factory Pattern

Welcome! In this session, we shift to the Factory Pattern, a creational design pattern that simplifies and encapsulates object creation in JavaScript applications.

Definition of Factory Pattern

The Factory Pattern is a design pattern that defines an interface for creating objects but lets subclasses decide which class to instantiate. It allows the creation of objects without specifying the exact class of the object.

Benefits of Factory Pattern

  • Provides an Interface for Creating Objects: Factory Pattern offers a unified interface to create objects without specifying the concrete class. This simplifies the process of creating objects.
  • Promotes Loose Coupling: It decouples the creation of objects from the concrete classes. This makes it easier to maintain and extend the system.
  • Encapsulates Object Creation: Factory Pattern encapsulates the object creation process, allowing you to manage and control the creation of objects centrally.
  • Improves Code Reusability: By centralizing object creation, Factory Pattern promotes code reusability and simplifies maintenance.
  • Reduces Code Complexity: It reduces the complexity of object creation by moving the logic to a separate class (factory).
  • Facilitates Testing: Factory Pattern makes it easier to test object creation, as you can isolate the creation process and test it independently.
  • Supports Parallel Development: Factory Pattern allows multiple developers to work on different parts of the system without interfering with each other.

When to Use Factory Pattern

  • When you need to create several related objects without specifying their concrete classes.
  • When you want to encapsulate the object creation process for better control and maintenance.
  • When you want to promote loose coupling in your system.
  • When you want to improve code reusability and reduce complexity.
  • When you want to facilitate testing and parallel development in your project.

Implementation of Factory Pattern

In JavaScript, you can implement the Factory Pattern using a factory function or class. The factory function returns a new object based on the provided parameters, while the factory class uses the new keyword to create objects.

Example of Factory Pattern in JavaScript

function VehicleFactory() {
  this.createVehicle = function(type) {
    switch (type) {
      case "car":
        return new Car();
      case "bike":
        return new Bike();
      default:
        return null;
    }
  };
}

const factory = new VehicleFactory();
const car = factory.createVehicle("car");
const bike = factory.createVehicle("bike");

Factory Pattern in Real-World Applications

Factory Pattern is widely used in real-world applications. For instance, it can be used to create database connections, UI components, or business objects.

Next Topic: Prototype Pattern

In the next session, we'll explore the Prototype Pattern. It's a creational design pattern that allows you to create new objects by cloning existing objects. Don't miss it! Follow us for more JavaScript mastery.