Book Image

Hands-On Dependency Injection in Go

By : Corey Scott
Book Image

Hands-On Dependency Injection in Go

By: Corey Scott

Overview of this book

Hands-On Dependency Injection in Go takes you on a journey, teaching you about refactoring existing code to adopt dependency injection (DI) using various methods available in Go. Of the six methods introduced in this book, some are conventional, such as constructor or method injection, and some unconventional, such as just-in-time or config injection. Each method is explained in detail, focusing on their strengths and weaknesses, and is followed with a step-by-step example of how to apply it. With plenty of examples, you will learn how to leverage DI to transform code into something simple and flexible. You will also discover how to generate and leverage the dependency graph to spot and eliminate issues. Throughout the book, you will learn to leverage DI in combination with test stubs and mocks to test otherwise tricky or impossible scenarios. Hands-On Dependency Injection in Go takes a pragmatic approach and focuses heavily on the code, user experience, and how to achieve long-term benefits through incremental changes. By the end of this book, you will have produced clean code that’s easy to test.
Table of Contents (15 chapters)

Healthy skepticism

As we journey through this book, you will look at some fantastic coding techniques and some not so great. I would ask you to spend some time pondering which is which. Continuous learning should be tempered with a healthy dose of skepticism. For each technique, I will lay out the pros and cons, but I would ask you to dig deeper. Ask yourself the following:

  • What is this technique trying to achieve?
  • What would my code look like after I apply this technique?
  • Do I really need it?
  • Are there any downsides to using this method?

Even when your inner skeptic dismisses the technique, you've at least learned to identify something you don't like and don't want to use, and learning is always a win.