Embracing the Dependency Inversion Principle

The DIP is one of the five principles that make up SOLID, a set of guidelines aimed at helping developers create more maintainable, flexible, and scalable software. Specifically, the DIP encourages developers to depend on abstractions, not on concrete implementations.

Note

The five principles of SOLID are the Single Responsibility Principle, Open-Closed Principle, Liskov Substitution Principle, Interface Segregation Principle, and Dependency Inversion Principle.

The DIP addresses several challenges that developers face when building and maintaining large systems. One such problem is the rigidity that comes from tightly coupled modules. When high-level modules are dependent on low-level modules, even small changes to the low-level code can have a broad impact, necessitating changes across the system.

Understanding how the DIP works

In terms of high-level modules and low-level modules, let’s think of a notification feature...