Suppose we want to create button and text area.
We can whether create them for Windows or Mac.
As I understood, there are two "switch" or "if" statements, one for selecting the desired factory and one for selecting the desired product.
But if I want to add "Linux" factory and "Text field" product, should I edit the code and add this third option to the "if" or "switch" statements?
Isn't it violating the open/close principle?
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