README.md

🚀 Exploring Dependency Injection in Go! 🌟

I recently worked on a project that showcases the Dependency Injection (DI) design pattern in Go. This project has helped me better understand how DI can improve code maintainability and testability.

What is Dependency Injection? 🤔

Dependency Injection is a software design pattern that allows a program to follow the Inversion of Control (IoC) principle. In simpler terms, it means that instead of a component creating its dependencies, they are provided to it externally. This promotes better separation of concerns, making the code easier to manage and test.

Why Use Dependency Injection? 💡

• Decoupling: By relying on abstractions (like interfaces), components can be developed and tested independently.
• Flexibility: Changing the behavior of a component becomes easier; you can swap out implementations without modifying the dependent code.
• Testability: Mocking dependencies for unit tests is straightforward, allowing for better test coverage.

My Implementation 💻

In my Go project, I implemented a simple email notification system using DI. Here's a brief overview:

1. EmailService Interface: Defined a common interface for different email services.

   type EmailService interface {
       SendEmail(to string, subject string, body string) error
   }

2. Concrete Implementations: Created two email services: ExpressEmailService and PremiumEmailService, each with its own implementation of the SendEmail method.

3. User Struct: Defined a User struct that associates each user with their respective email service.

4. NotifyUsers Function: Implemented a function that takes a list of users and sends emails using their specified email service.

   func NotifyUsers(users []User) {
       for _, user := range users {
           user.EmailService.SendEmail(user.Email, "Hello from Go!", "This is an injected email service!")
       }
   }

5. Testing: Developed a mock email service to validate that the notifications were sent correctly, ensuring my implementation works as expected.

Conclusion 🎉

This exercise in implementing Dependency Injection has not only reinforced my understanding of Go's capabilities but has also improved my coding practices by embracing design patterns that lead to cleaner and more maintainable code.

If you're interested in learning more about Go or Dependency Injection, feel free to connect! Let's share knowledge and grow together! 🌱