Design Patterns in Rust

The book "Design Patterns in Rust" is a practical guide that will help you master classic and modern design patterns in the context of Rust's unique paradigm. Unlike traditional pattern books focused on object-oriented languages, this edition takes into account Rust's features: ownership, borrowing, lifetimes, lack of inheritance, and a strong type system.

What this book is about

You will learn how to adapt well-known GoF (Gang of Four) patterns and functional approaches to the Rust ecosystem. Each pattern is examined with real-world examples, explaining how it solves specific problems of performance, memory safety, and code maintainability. Special attention is given to:

• Creational patterns: Builder, Factory, Abstract Factory — considering strict ownership rules.
• Structural patterns: Adapter, Composite, Decorator — implemented through traits and generic types.
• Behavioral patterns: Strategy, Observer, Command — using closures, traits, and channels.
• Functional patterns: monads, functors, combinators — adapted to Rust idioms (Result, Option, Iterator).
• Advanced techniques: RAII, smart pointers, interior mutability, type state pattern.

Who this book is for

The book is intended for developers who already have basic programming experience in Rust (understanding of ownership, borrowing, traits). It will be useful for:

• Engineers transitioning from C++, Java, or Python who want to write idiomatic Rust.
• Systems software developers striving for safe and efficient architecture.
• Architects designing large-scale Rust projects from scratch.
• Anyone who wants to deepen their understanding of the language and learn best practices.

What you will learn

• How to avoid common mistakes when implementing classic patterns in Rust.
• How to use the type system for compile-time guarantees.
• How to combine imperative and functional styles for clean code.
• How to design extensible and testable APIs.
• How to apply patterns for working with asynchrony and concurrency.
• How to refactor existing code by introducing patterns without losing performance.

The book contains numerous code listings, comments, and practical exercises. All examples are tested on the latest stable version of Rust (edition 2021). After reading, you will be able to confidently design application architecture using the language's strengths.