Data Type Should Not Be Considered As a Source of Its Behaviour

[IharBury]

I expect an article proposing separating behavior from data types, to discuss abstractions, interface vs implementation, open-closed principle, breaking changes. The only point I see it this article is that one may want to have an operation which involves multiple data types and doesn't fit just one of the data type abstractions.

[guseynchick]

Probably in the future I am going to cover those subjects as well, thanks for the feedback. Here I just wanted to make the point that it’s not right (in my opinion) to combine type with its functionality, because function’s arguments must be equally considered as just a parts of one process which a function represents.