I want to introduce a powerful tool in the arsenal of software engineers aiming to write clean, flexible, and maintainable code. The tool that most developers would need to upgrade the code without modifying the existing client code , and it is particularly helpful in scenarios involving algorithms of your code. The tool is called “Strategy Pattern“.
What is Strategy Pattern?
Strategy Pattern is a behavioral pattern that enables the selection of algorithms at runtime. This tool is crucial for developing flexible, maintainable, and modular code. Especially when multiple algorithms are applied to solve a problem. The key goal is to allow software entites be open for extension but closed for modification, meaning without having any impact or changed on the client code, but modifying and extending it.
Type of Strategy Pattern
- Context – Holds a reference to a Strategy, delgates work to it. The Context doesn’t implent algorithm logic itself.
- Strategy Interface – Defines a common method (or set of methods) that all strategies must implement, so they’re interchangeable.
- Concrete Strategies: Classes implementing the Strategy interface, each providing a different algorithm implementation.
Benefits
- Flexibility – New strategies can be added without modifying existing code.
- Seperation of Concerns – Context is freed from algorithm details; each strategy handles its own logic
- Easy to test: You can test each strategy class independently.
Disadvantage scenario
- Using pattern strategy creates more classes to manage, which can complicate desgin
- Some abstraction layers which may or may not be worth it in simpler scenarios.
Conclusion
The startegy patterns is useful when you have multiple algorithms or behaviors that needs to be added or swaped dynamically, in order to solve problem without impacting the existing code. It helps you build modular, maintainable, and extensible systems. But you should be mindful about the extra complexity it comes with.
From the blog CS@Worcester – Nguyen Technique by Nguyen Vuong and used with permission of the author. All other rights reserved by the author.