Learning Factory Pattern
Introduction to the Factory Design Pattern
The factory pattern is a creational design pattern used to create objects or families of objects dynamically. It simplifies the process of creating objects and decides the type of object based on given options. It provides an interface for creating objects but leaves the final implementation to other classes. As with many other design patterns, there are different ways of implementing the factory pattern.
To better understand how it works, consider a car factory. A car is manufactured in a factory, but the process of sourcing raw materials, molding, testing, assembly, and everything in between is hidden from the end user. In the factory, different departments may be responsible for different parts of the car, such as wiring. Within the wiring department, there may be different sections that deal with the electrical and electronic aspects of wiring, each producing the type of cable needed for a specific part of the car.
Advantages of the Factory Pattern
Advantages of the factory pattern include:
- Simplifying the creation of multiple related objects.
- Hiding the complexities involved in creating objects.
- Making the code easy to read and understand.
- Promoting encapsulation.
- Making it easy to write tests for classes used in this pattern.
The factory pattern is also easy to maintain, as new types of objects can be added without affecting existing code. Code is decoupled since the creation of objects is delegated to other classes.
Disadvantages of the Factory Pattern
On the downside, the factory pattern may increase code complexity and introduce overhead, depending on the implementation. In some cases, there could be tight coupling instead of loose coupling, limiting extensibility. Overcoming this challenge may require introducing even more complexity.
In the next segment, you’ll see a demo of how to implement the factory pattern in your e-commerce app.