What is dependency injection and why is it important?

What is dependency injection and why is it important?

Dependency injection is a design pattern used in software development to improve code modularity and testability. It allows a class to receive its dependencies from an external source rather than creating them internally.

Can you give me an example of how it works?

Sure! Imagine a class Car that requires an Engine to function. Instead of the Car creating the Engine itself, you can inject the Engine into the Car through its constructor. This way, you can easily swap out different Engine implementations.

What are the benefits of using dependency injection?

The main benefits include improved code maintainability, easier testing, and better separation of concerns. It allows for more flexible and reusable code.

Are there any downsides to using dependency injection?

Yes, it can introduce complexity and may lead to over-engineering if not used judiciously. It's important to balance its use with the project's needs.