It depends what you mean by "OOP". Generally most mainstreams programming languages are mixed: that is they support more than one paradigm (e.g. procedural, cla

It depends what you mean by "OOP". Generally most mainstreams programming languages are mixed: that is they support more than one paradigm (e.g. procedural, class based OOP, functional, etc). Though I've noticed that programmers these days often equate OOP with classes. Therefore anything with classes is OOP whereas anything without isn't. This comes up a lot with languages, such as Rust, that are OOP but lack the class keyword.