The Dependency Injection pattern
The Dependency Injection pattern involves passing the dependencies of a class as external entities rather than creating them within the class. This promotes loose coupling, modularity, and testability.
Real-world examples
We come across the following examples in real life:
- Electrical appliances and power outlets: Various electrical appliances can be plugged into different power outlets to use electricity without needing direct and permanent wiring
- Lenses on cameras: A photographer can change lenses on a camera to suit different environments and needs without changing the camera itself
- Modular train systems: In a modular train system, individual cars (such as sleeper, diner, or baggage cars) can be added or removed depending on the needs of each journey
Use cases for the Dependency Injection pattern
In web applications, injecting database connection objects into components such as repositories or services enhances modularity...
