Dependency Injection: A Clean Approach to Building Modular Applications

Dependency Injection (DI) is a powerful design pattern that promotes loose coupling and modularity in software applications. By decoupling components, DI makes your code more maintainable, testable, and flexible.

What is Dependency Injection?

In simple terms, DI is a technique where objects receive their dependencies from external sources rather than creating them internally. This allows for greater flexibility and testability, as components can be easily swapped or mocked during testing.

Types of Dependency Injection:

Constructor Injection:

Dependencies are passed to a class's constructor.
This is the most common and preferred approach, as it ensures that all required dependencies are provided upfront.
Setter Injection:

Dependencies are injected through setter methods.
This can be useful when optional dependencies are needed.
Method Injection: