https://en.wikipedia.org/wiki/Dependency_injection https://en.wikipedia.org/wiki/Dependency_injection This is very similar to dependency injection. Separating

https://en.wikipedia.org/wiki/Dependency_injection https://en.wikipedia.org/wiki/Dependency_injection This is very similar to dependency injection. Separating state and construction from function or method implementation makes things a lot easier to test. In my opinion it's also easier to comprehend what the code actually does.