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<ol class="chapter"><li class="expanded affix "><a href="title-page.html">The Rust Programming Language</a></li><li class="expanded affix "><a href="foreword.html" class="active">Foreword</a></li><li class="expanded affix "><a href="ch00-00-introduction.html">Introduction</a></li><li class="expanded "><a href="ch01-00-getting-started.html"><strong aria-hidden="true">1.</strong> Getting Started</a></li><li><ol class="section"><li class="expanded "><a href="ch01-01-installation.html"><strong aria-hidden="true">1.1.</strong> Installation</a></li><li class="expanded "><a href="ch01-02-hello-world.html"><strong aria-hidden="true">1.2.</strong> Hello, World!</a></li><li class="expanded "><a href="ch01-03-hello-cargo.html"><strong aria-hidden="true">1.3.</strong> Hello, Cargo!</a></li></ol></li><li class="expanded "><a href="ch02-00-guessing-game-tutorial.html"><strong aria-hidden="true">2.</strong> Programming a Guessing Game</a></li><li class="expanded "><a href="ch03-00-common-programming-concepts.html"><strong aria-hidden="true">3.</strong> Common Programming Concepts</a></li><li><ol class="section"><li class="expanded "><a href="ch03-01-variables-and-mutability.html"><strong aria-hidden="true">3.1.</strong> Variables and Mutability</a></li><li class="expanded "><a href="ch03-02-data-types.html"><strong aria-hidden="true">3.2.</strong> Data Types</a></li><li class="expanded "><a href="ch03-03-how-functions-work.html"><strong aria-hidden="true">3.3.</strong> Functions</a></li><li class="expanded "><a href="ch03-04-comments.html"><strong aria-hidden="true">3.4.</strong> Comments</a></li><li class="expanded "><a href="ch03-05-control-flow.html"><strong aria-hidden="true">3.5.</strong> Control Flow</a></li></ol></li><li class="expanded "><a href="ch04-00-understanding-ownership.html"><strong aria-hidden="true">4.</strong> Understanding Ownership</a></li><li><ol class="section"><li class="expanded "><a href="ch04-01-what-is-ownership.html"><strong aria-hidden="true">4.1.</strong> What is Ownership?</a></li><li class="expanded "><a href="ch04-02-references-and-borrowing.html"><strong aria-hidden="true">4.2.</strong> References and Borrowing</a></li><li class="expanded "><a href="ch04-03-slices.html"><strong aria-hidden="true">4.3.</strong> The Slice Type</a></li></ol></li><li class="expanded "><a href="ch05-00-structs.html"><strong aria-hidden="true">5.</strong> Using Structs to Structure Related Data</a></li><li><ol class="section"><li class="expanded "><a href="ch05-01-defining-structs.html"><strong aria-hidden="true">5.1.</strong> Defining and Instantiating Structs</a></li><li class="expanded "><a href="ch05-02-example-structs.html"><strong aria-hidden="true">5.2.</strong> An Example Program Using Structs</a></li><li class="expanded "><a href="ch05-03-method-syntax.html"><strong aria-hidden="true">5.3.</strong> Method Syntax</a></li></ol></li><li class="expanded "><a href="ch06-00-enums.html"><strong aria-hidden="true">6.</strong> Enums and Pattern Matching</a></li><li><ol class="section"><li class="expanded "><a href="ch06-01-defining-an-enum.html"><strong aria-hidden="true">6.1.</strong> Defining an Enum</a></li><li class="expanded "><a href="ch06-02-match.html"><strong aria-hidden="true">6.2.</strong> The match Control Flow Operator</a></li><li class="expanded "><a href="ch06-03-if-let.html"><strong aria-hidden="true">6.3.</strong> Concise Control Flow with if let</a></li></ol></li><li class="expanded "><a href="ch07-00-managing-growing-projects-with-packages-crates-and-modules.html"><strong aria-hidden="true">7.</strong> Managing Growing Projects with Packages, Crates, and Modules</a></li><li><ol class="section"><li class="expanded "><a href="ch07-01-packages-and-crates.html"><strong aria-hidden="true">7.1.</strong> Packages and Crates</a></li><li class="expanded "><a href="ch07-02-defining-modules-to-control-scope-and-privacy.html"><strong aria-hidden="true">7.2.</strong> Defining Modules to Control Scope and Privacy</a></li><li class="expanded "><a href="ch07-03-paths-for-referring-to-an-item-in-the-modu
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<h1 class="menu-title">The Rust Programming Language</h1>
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<main>
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<h1><a class="header" href="#foreword" id="foreword">Foreword</a></h1>
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<p>It wasn’t always so clear, but the Rust programming language is fundamentally
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about <em>empowerment</em>: no matter what kind of code you are writing now, Rust
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empowers you to reach farther, to program with confidence in a wider variety of
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domains than you did before.</p>
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<p>Take, for example, “systems-level” work that deals with low-level details of
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memory management, data representation, and concurrency. Traditionally, this
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realm of programming is seen as arcane, accessible only to a select few who
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have devoted the necessary years learning to avoid its infamous pitfalls. And
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even those who practice it do so with caution, lest their code be open to
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exploits, crashes, or corruption.</p>
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<p>Rust breaks down these barriers by eliminating the old pitfalls and providing a
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friendly, polished set of tools to help you along the way. Programmers who need
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to “dip down” into lower-level control can do so with Rust, without taking on
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the customary risk of crashes or security holes, and without having to learn
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the fine points of a fickle toolchain. Better yet, the language is designed to
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guide you naturally towards reliable code that is efficient in terms of speed
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and memory usage.</p>
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<p>Programmers who are already working with low-level code can use Rust to raise
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their ambitions. For example, introducing parallelism in Rust is a relatively
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low-risk operation: the compiler will catch the classical mistakes for you. And
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you can tackle more aggressive optimizations in your code with the confidence
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that you won’t accidentally introduce crashes or vulnerabilities.</p>
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<p>But Rust isn’t limited to low-level systems programming. It’s expressive and
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ergonomic enough to make CLI apps, web servers, and many other kinds of code
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quite pleasant to write — you’ll find simple examples of both later in the
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book. Working with Rust allows you to build skills that transfer from one
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domain to another; you can learn Rust by writing a web app, then apply those
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same skills to target your Raspberry Pi.</p>
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<p>This book fully embraces the potential of Rust to empower its users. It’s a
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friendly and approachable text intended to help you level up not just your
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knowledge of Rust, but also your reach and confidence as a programmer in
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general. So dive in, get ready to learn—and welcome to the Rust community!</p>
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<p>— Nicholas Matsakis and Aaron Turon</p>
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