Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “In NavigationStack, there’s a new view modifier called navigationDestination, which allows us to define a destination separately according to a state change.”

A block of code is set as follows:

enum Screen: Hashable {
    case signin
    case onboarding
    case mainScreen
    case settings
}
@State var path: [Screen] = []

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

struct CoordinatorView: View {
    @ObservedObject private var coordinator = Coordinator()
    var body: some View {
        NavigationStack(path: $coordinator.path) {
            AlbumListView()
                .navigationDestination(for: PageAction.self, destination: { pageAction in
                    coordinator.buildView(forPageAction: pageAction)
                })
        }
        .environmentObject(coordinator)
    }
}

Any command-line input or output is written as follows:

@testable import Chapter14

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “The code creates a blue circle and a button saying Start.”

Tips or important notes

Appear like this.