[dependency-injection] Dependency Injection vs Factory Pattern

You can have a look at this link for a comparison of the two (and others) approaches in a real example.

Basically, when requirements change, you end up modifying more code if you use factories instead of DI.

This is also valid with manual DI (i.e. when there isn't an external framework that provides the dependencies to your objects, but you pass them in each constructor).

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