Textbook in PDF format The Rust Programming Language, 3rd Edition, teaches you to write code that the compiler can verify, teams can maintain, and systems can evolve safely over time. Written by longtime Rust community members, this book shows you how to work effectively with Rust’s type system, concurrency model, and tooling, using patterns and idioms chosen for long-term stability. Learn how to: Design programs that communicate their invariants to the compiler Use ownership, lifetimes, and traits to model real-world constraints Write concurrent and multithreaded code with confidence and clarity Build, test, document, and refactor projects using Cargo effectively Handle errors explicitly and idiomatically Apply expressive pattern matching to simplify complex logic Three substantial project chapters—focusing on a number-guessing game, a command-line tool, and a multithreaded server—demonstrate how these concepts work together in complete, real programs. Whether you’re new to Rust or already using it in production, this book helps you write code that scales safely and makes its guarantees explicit. New to this edition: Complete async programming chapter Miri for analyzing unsafe code Built on the Rust 2024 Edition Modern Rust idioms, tooling, and practice Chapter 1 explains how to install Rust, how to write a “Hello, world!” program, and how to use Cargo, Rust’s package manager and build tool. Chapter 2 is a hands-on introduction to writing a program in Rust, having you build up a number-guessing game. Here, we cover concepts at a high level, and later chapters will provide additional detail. If you want to get your hands dirty right away, Chapter 2 is the place for that. If you’re a particularly meticulous learner who prefers to learn every detail before moving on to the next, you might want to skip Chapter 2 and go straight to Chapter 3, which covers Rust features that are similar to those of other programming languages; then, you can return to Chapter 2 when you’d like to work on a project applying the details you’ve learned. In Chapter 4, you’ll learn about Rust’s ownership system. Chapter 5 discusses structs and methods. Chapter 6 covers enums, match expressions, and the if let and let...else control flow constructs. You’ll use structs and enums to make custom types. In Chapter 7, you’ll learn about Rust’s module system and about privacy rules for organizing your code and its public application programming interface (API). Chapter 8 discusses some common collection data structures that the standard library provides: vectors, strings, and hash maps. Chapter 9 explores Rust’s error-handling philosophy and techniques. Chapter 10 digs into generics, traits, and lifetimes, which give you the power to define code that applies to multiple types. Chapter 11 is all about testing, which even with Rust’s safety guarantees is necessary to ensure that your program’s logic is correct. In Chapter 12, we’ll build our own implementation of a subset of functionality from the grep command line tool that searches for text within files. For this, we’ll use many of the concepts we discussed in the previous chapters. Chapter 13 explores closures and iterators: features of Rust that come from functional programming languages. In Chapter 14, we’ll examine Cargo in more depth and talk about best practices for sharing your libraries with others. Chapter 15 discusses smart pointers that the standard library provides and the traits that enable their functionality. In Chapter 16, we’ll walk through different models of concurrent programming and talk about how Rust helps you program in multiple threads fearlessly. In Chapter 17, we build on that by exploring Rust’s async and await syntax, along with tasks, futures, and streams, and the lightweight concurrency model they enable. Chapter 18 looks at how Rust idioms compare to object-oriented programming principles you might be familiar with. Chapter 19 is a reference on patterns and pattern matching, which are powerful ways of expressing ideas throughout Rust programs. Chapter 20 contains a smorgasbord of advanced topics of interest, including unsafe Rust, macros, and more about lifetimes, traits, types, functions, and closures. In Chapter 21, we’ll complete a project in which we’ll implement a low-level multithreaded web server! Finally, some appendixes contain useful information about the language in a more reference-like format. Appendix A covers Rust’s keywords, A ppendix B covers Rust’s operators and symbols, Appendix C covers derivable traits provided by the standard library, Appendix D covers some useful development tools, and Appendix E explains Rust editions. Who This Book Is For: This book assumes that you’ve written code in another programming language, but it doesn’t make any assumptions about which one. We’ve tried to make the material broadly accessible to those from a wide variety of programming backgrounds. We don’t spend a lot of time talking about what programming is or how to think about it. If you’re entirely new to programming, you would be better served by reading a book that specifically provides an introduction to programming