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I upvoted you. Why OOP is bad: In 8 years professional (for money) programming experience i had zero use cases for OOP. Every time I tried to use OOP it backfired and I abandoned it. Maybe I just never really understood OOP or maybe I already use OOP all the time without calling it OOP.

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My main conclusion on the subject is that it really depends on what domain you're coding in.

There are plenty of applications I would never use OOP for. I use Elixir for my backend work. I tend to use OOP for interactive simulation/game sorts of applications.

What were the types of problems and systems you have worked on? Which languages and programming styles (eg functional) did you end up using to solve them?

Mostly math, optimization and data transformations. Since java8 I use functional style (map, filter, monads..). A lot of business logic is also in sql queries.

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