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In this chapter, we'll learn how to manage the state of SwiftUI views using Combine. At the Worldwide Developers Conference (WWDC) 2019, Apple not only introduced SwiftUI but also Combine, a perfect companion to SwiftUI for managing the declarative change of state in Swift. In recent years, given the success of Functional Reactive Programming (FRP) in different sectors of the industry, the same concept has been used in the iOS ecosystem. It was first implemented with ReactiveCocoa, the original framework in Objective-C. That framework was converted into Swift with ReactiveSwift. Finally, it was converted into RxSwift, which became the default framework for performing FRP in iOS. In typical Apple way, Apple took the best practices that have matured over years of trial and error from the community, and instead of acquiring either ReactiveSwift or RxSwift, Apple decided to reimplement their concepts, simplify their...