Swift 5 Unveiled: Uncovering the Secrets of Swift 5

Introduction

The book "Swift 5 Unveiled" by Adrian Bolboacă was released in 2019 and immediately attracted the attention of the iOS and macOS developer community. Despite its modest size — only 120 pages — the publication promises to "uncover the secrets" of the fifth version of the Swift language. On the educational portal PythonLib, we decided to carefully analyze this book to understand how useful it is for beginners and experienced programmers, and whether it is worth spending time studying it.

What is this book about?

"Swift 5 Unveiled" is a compact but rich guide that covers the key features of Swift 5. The author does not try to cover everything, but focuses on the practical aspects of the language that a developer most often needs in daily work. The book is structured as a sequential immersion: from basic syntax to advanced topics such as memory management, protocols, and generic programming.

Special attention is paid to the innovations of Swift 5: ABI stability, improved strings, new capabilities of Result types, and dynamic lookup. Each chapter contains code examples that can be run immediately in Xcode Playground.

Who is this book for?

The book is intended for beginner developers who already have a basic understanding of programming (for example, know Python or JavaScript) and want to quickly learn Swift. It will also be useful for those transitioning from Objective-C to Swift and wanting to understand the philosophy of the new language. Experienced Swift developers will likely find little new, but may use the book as a cheat sheet for Swift 5.

What will the reader learn?

• Basics of Swift 5 syntax: variables, constants, data types, optionals, control structures.
• Working with collections: arrays, dictionaries, sets, as well as functional methods map, filter, reduce.
• Object-oriented programming: classes, structures, enumerations, inheritance, polymorphism.
• Protocols and extensions: how to use protocols to build flexible architecture.
• Memory management: ARC, strong and weak references, closures, and variable capture.
• Error handling: try/catch, Result type, optional values.
• Innovations of Swift 5: ABI stability, improved strings, dynamic member lookup.
• Basics of working with Xcode and Playground: how to write, test, and debug code.

Strengths of the book

The first thing that stands out is conciseness. The author does not waste time on long theoretical digressions, but gets straight to the point. The code is written cleanly and accompanied by comments. The second is relevance. At the time of release, the book fully corresponded to Swift 5, and many examples still work today (considering backward compatibility). The third is structure. Each chapter ends with a brief summary, which helps consolidate the material.

Special mention should be made of the chapter on ABI stability — it is written in accessible language and explains why this is important for the Apple ecosystem. The topic of protocols and protocol-oriented programming, which is one of the key features of Swift, is also well covered.

Disadvantages

The main drawback is the small volume. 120 pages is very little for a full-fledged study of the language. Many topics (for example, multithreading, networking, SwiftUI) are either not covered or mentioned in passing. The book is more like an extended article than a textbook. In addition, there are no practical exercises and projects, which reduces the learning effect.

It is also worth noting that the book was published in 2019, and since then Swift 5.1, 5.2, 5.3, and 5.4 have been released, which added many new features (for example, Property Wrappers, Result Builders, async/await). Therefore, "Swift 5 Unveiled" does not