Conventions used

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

CodeInText: 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: "The decode() function returns a future for HTTPStatus".

A block of code is set as follows:

router.post("new") { req -> Future<HTTPStatus> in
    return req.content.decode(Entry.self).map { entry in
        print("Appended a new entry: \(entry)")
        return HTTPStatus.ok
    }
}

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

import Foundation

struct Entry: Codable {
    
    var id: String
    var title: String?
    var content: String?
    
    init(id: String, title: String? = nil, content: String? = nil) {
        self.id = id
        self.title = title
        self.content = content
    }
}

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

 $ vapor build
 $ vapor run

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Navigate down the list and click on the Swift Web App with Kitura icon".