I have been doing some research into reactive programming recently and I'm finding it hard to find a good description of the difference between Reactive and Functional-Reactive.

Is it simply that the reactive programming is implemented using functional methods/paradigms as opposed to using declarative or OO paradigms?

The difference between Reactive and Functional-Reactive programming

I'd like to know how Reactive Programming is tied to Functional-Programming.

Most papers refer "Reactive Programming" as "Functional Reactive Programming".

Does Reactive Programming can be implemented outside Functional Programming?

Is it easier to write Reactive Programs with Functional Language?

 It is easier to write reactive programs functionally. It is not easier to write them to perform faster by using functional programming. Reusing mutable state is often faster than creating new immutable objects all the time. So if you are using the reactive programming for performance, I wouldn't use functional programming.

Often developers feel they have to use multiple threads or cores, because they are there. This is like saying you need to use 100% of disk space or you are wasting it.

IMHO you should only add the complexity of multiple threads if it improves performance and it is the simplest way to achieve this improvement. What is often forgotten in the discussion about making concurrency easier is that the easiest solution is to use one thread, and, unless you have proven your solution is faster than that, you haven't convinced me that using multiple threads was ever helpful.

Is Reactive Programming bounded to Functional programming?

I'm new to programming and while researching OOP principles, I found out that some sources claim that there are 4 main principles, on the other hand others say that there are 3 of them (Not including abstraction) I couldn't find proper answer on this topic, so can someone pls help me ? 

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