Learning Functional Programming in Go

Dependency injection

Dependency injection (DI) is a form of Inversion of Control and also impacts the flow of control in an application. Although the observer pattern's callback mechanism can modify the flow at many times and in many places in an application, DI typically performs the flow of control configuration during application initialization.

Since this chapter is mainly about a layered architecture and the management of dependencies to prevent circular dependency errors, we will not explore pub/sub architectures and the observer pattern. Instead, we will choose DI to reconcile our dependencies in our main function.