Satisfying dependency can be setting up some pointer to a function, passing an instance of already created interface, asking some factory to supply it etc. etc

Satisfying dependency can be setting up some pointer to a function, passing an instance of already created interface, asking some factory to supply it etc. etc. As in everything in life there is no single universal answer on what is the best way to accomplish the task. What one uses in practice depends very much from problem complexity, one's experience / personal preferences, implementation language / environment features etc. etc. I think there is no real need to dwell over the subject without knowing particular context