WebAssembly in Rust: A Developer's Guide to High-Performance Web Programming with Safe Systems Code is your complete, practical resource for mastering how to build fast, secure, and portable applications by combining the strengths of Rust and WebAssembly.

Whether you're a web developer looking to push past JavaScript's performance limits, a systems programmer exploring new deployment targets, or a full-stack engineer seeking the next-generation backend runtime, this book gives you the knowledge and tools to use WebAssembly professionally-with Rust as your systems-grade language.

You'll learn how to write Rust code that compiles to .wasm, interface safely with JavaScript, manipulate the DOM, optimize Wasm binaries, and deploy both in browsers and on backend platforms like Cloudflare Workers and Wasmtime. With deep coverage of WASI, interop, memory management, and CI/CD pipelines, this book doesn't just show you how-it shows you how to build software that is fast, safe, and production-ready.

Through step-by-step walkthroughs, real-world examples, and tested patterns, you'll learn:

• Why Rust and WebAssembly make an ideal combination
• How to set up a reliable Rust-Wasm development environment
• How to communicate between JavaScript and Wasm effectively
• How to optimize performance, reduce bundle size, and improve loading
• How to use WASI and run Rust-Wasm modules on the server
• How to debug, test, and deploy Wasm apps with confidence
• How to reuse Wasm modules across browsers, backend, and desktop apps

If you're serious about building software that runs anywhere with speed and safety at its core, this book will equip you with the techniques and clarity to get there.