Dependency injection is great technique for decoupling code, making it more stable, testable and robust. The technique consists in designing your code to receive dependencies. In object oriented languages, we usually use the class constructor to do it. So when someone creates an instance of your object, all dependencies will be injected into it. That makes perfect sense as dependencies shouldn’t be part of interface signatures, otherwise all implementations would have to receive the dependencies as parameters for doing their job. But each implementation can have different dependencies based on what they do. Well you get the problem, right?

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