What is ReactiveSwift?

ReactiveSwift is a Swift framework for Functional Reactive Programming (FRP). It provides abstractions for dealing with asynchronous data streams and propagation of change. It's commonly used for handling UI events, network requests, and managing state in a reactive and declarative manner. Key concepts include Signals (streams of values over time) and SignalsProducers (descriptions of how Signals are created), enabling composition, transformation, and observation of data flows. It allows developers to write more maintainable and testable code by decoupling components and managing side effects in a controlled way.