ReactiveSwift
ReactiveSwift is a Swift framework for reactive and functional programming, implementing the Reactive Extensions (Rx) paradigm. It provides abstractions like Signal and SignalProducer for handling asynchronous data streams and events in a declarative, composable manner. The framework enables developers to write more predictable and maintainable code by modeling time-varying values and side effects.
Developers should learn ReactiveSwift when building iOS or macOS applications that require complex asynchronous operations, such as real-time UI updates, network requests, or event-driven architectures. It is particularly useful for managing state changes, handling user interactions, and coordinating multiple data sources in a clean, functional style, reducing callback hell and improving testability.