Object-Oriented Design Patterns #3 — Factory Method
Object-oriented design patterns series — Factory Method. Short notes in plain English, use cases and live examples.
Factory Method is a creational OO design pattern. It is useful when a program should flexibly operate with several classes following the same interface. Classes of the same interface are called “Products”. The key point here is that a client code knows only about the “Product” interface and nothing about the specific implementations.
Just imagine a situation when you want to change your bicycle for a newer one. You are not concerned about the implementation details thinking about how to ride it — you already know how to spin pedals and steer it! (See the “D” principle from SOLID.)
Use Cases
- Multiplatform UI components library
- A set of different Employee classes: Admin, Writer, Reviewer…
UML Diagram
Example
TypeScript code example may be found in my GitHub repo.
Also, there is a visualization of how this pattern may be used on my GitHub page. This is a contrived example, so, don’t judge too strong, please.
References
NEXT (coming soon…)
