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Encapsulation, inheritance and polymorphism all work fine with JavaScript classes. OOP works just fine.

What doesn't work in JavaScript is functional programming.

I don’t see how? You can do all sorts of FP in js and it even has some of it in its built in APIs. .then comes from FP

Yes, but promises are (unfortunately) _not_ monads!

You are right, there are some FP features in JavaScript. But the way it is used in the predominant UI framework (namely React) is definitely breaks FP, see https://mckoder.medium.com/why-react-is-not-functional-b1ed1...

JS is primarily a functional language, it is built around functions as first class objects and closures.

The issue is the bar has been raised for what people call "functional" now. Everyone is picky "OMG not pure so it isn't really functional!!"

Yeesh.