Dependency Injection

Dependency injection (DI) is a software design pattern that aims to separate the building of a dependency from its usage. It’s based on the concept that we don’t have to instantiate a dependency in the same place where we’re going to use it. The burden of constructing is exported to another component of our software, which acts as a builder. If we initialize the dependency within our function, we introduce a rigidity that can prevent us from writing flexible and testable code