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Functional Reactive programming

The combination of FP and RP is known as function Reactive programming or, for short, FRP. It is a multiparadigm and combines the benefits and best features of two of the most popular programming paradigms, which are, FP and RP.

FRP is a new programming paradigm or a new style of programming that uses the RP paradigm to support asynchronous non-blocking data streaming with backpressure and also uses the FP paradigm to utilize its features (such as pure functions, immutability, no side effects, RT, and more) and its HOF or combinators (such as map, flatMap, filter, reduce, fold, and zip).

Refer to Chapter 7, Working with Reactive Streams, to know more about backpressure.

In simple words, FRP is a new programming paradigm to support RP using FP features and its building blocks.

FRP = FP + RP, as shown here:

Today, we have many FRP solutions, frameworks, tools, or technologies. Here's a list of a few FRP technologies:

Scala, Play Framework, and Akka Toolkit
RxJS
Reactive-banana
Reactive
Sodium
Haskell

This book is dedicated toward discussing Lightbend's FRP technology stack—Lagom Framework, Scala, Play Framework, and Akka Toolkit (Akka Streams).

FRP technologies are mainly useful in developing interactive programs, such as rich GUI (graphical user interfaces), animations, multiplayer games, computer music, or robot controllers.