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I would say specifically encapsulation of mutable data


Lots of modern OO uses immutable data.


A lot of the underlying intuition behind OOP is expressed as "cells exchanging messages like an organism" and such, and I think that implies the distribution of state among a variety of small, special-purpose state-managers. More functional variants of OOP where state is managed centrally are a meaningful shift away from traditional ideas of OOP, and I think calling them both equally OO glosses over that shift a little.


What's a good example? What comes to my mind is modern C# which I would say is a multi-paradigm language that encourages things like immutable records and interfaces and composition over inheritance as alternatives to the now less favoured OOP styles that it also supports




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