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web-sys: A requestAnimationFrame Loop View full source code or view the compiled example online This is an example of a requestAnimationFrame loop using the web-sys crate! It renders a count of how many times a requestAnimationFrame callback has been invoked and then it breaks out of the requestAnimationFrame loop after 300 iterations. Cargo.toml You can see here how we depend on web-sys and activ
Design of wasm-bindgen This section is intended to be a deep-dive into how wasm-bindgen internally works today, specifically for Rust. If you're reading this far in the future it may no longer be up to date, but feel free to open an issue and we can try to answer questions and/or update this! Foundation: ES Modules The first thing to know about wasm-bindgen is that it's fundamentally built on the
Tutorial: Conway's Game of Life This is a tutorial that implements Conway's Game of Life in Rust and WebAssembly. Who is this tutorial for? This tutorial is for anyone who already has basic Rust and JavaScript experience, and wants to learn how to use Rust, WebAssembly, and JavaScript together. You should be comfortable reading and writing basic Rust, JavaScript, and HTML. You definitely do not ne
Rust 🦀 and WebAssembly 🕸 This small book describes how to use Rust and WebAssembly together. Who is this book for? This book is for anyone interested in compiling Rust to WebAssembly for fast, reliable code on the Web. You should know some Rust, and be familiar with JavaScript, HTML, and CSS. You don't need to be an expert in any of them. Don't know Rust yet? Start with The Rust Programming Lang
This book is about wasm-bindgen, a Rust library and CLI tool that facilitate high-level interactions between Wasm modules and JavaScript. The wasm-bindgen tool and crate are only one part of the Rust and WebAssembly ecosystem. If you're not familiar already with wasm-bindgen it's recommended to start by reading the Game of Life tutorial. If you're curious about wasm-pack, you can find that documen
This book is about wasm-bindgen, a Rust library and CLI tool that facilitate high-level interactions between wasm modules and JavaScript. The wasm-bindgen tool and crate are only one part of the Rust and WebAssembly ecosystem. If you're not familiar already with wasm-bindgen it's recommended to start by reading the Game of Life tutorial. If you're curious about wasm-pack, you can find that documen
Shrinking .wasm Code Size This section will teach you how to optimize your .wasm build for a small code size footprint, and how to identify opportunities to change your Rust source such that less .wasm code is emitted. Why Care About Code Size? When serving a .wasm file over the network, the smaller it is, the faster the client can download it. Faster .wasm downloads lead to faster page load times
web-sys: Closures View full source code or view the compiled example online One of the features of #[wasm_bindgen] is that you can pass closures defined in Rust off to JS. This can be a bit tricky at times, though, so the example here shows how to interact with some standard web APIs with closures. src/lib.rs #![allow(unused)] fn main() { use js_sys::{Array, Date}; use wasm_bindgen::prelude::*; us
Introduction This book is about wasm-bindgen, a Rust library and CLI tool that facilitate high-level interactions between Wasm modules and JavaScript. The wasm-bindgen tool and crate are only one part of the Rust and WebAssembly ecosystem. If you're not familiar already with wasm-bindgen it's recommended to start by reading the Game of Life tutorial. If you're curious about wasm-pack, you can find
When WebAssembly was first shipped it was an MVP which, while minimal, has spawned a huge number of exciting projects which work today across all major browsers. Rust has capitalized on the wasm MVP’s success as well with tools like wasm-bindgen and wasm-pack by making the MVP feel less minimal. WebAssembly is yet more ambitious, though! Since inception it’s always been intended to extend the WebA
We are pleased to announce the first release of the web-sys crate! It provides raw bindings to all the Web’s APIs: everything from DOM manipulation to WebGL to Web Audio to timers to fetch and more! Almost three months ago, we laid out our vision for wasm-bindgen: We are building a shared foundation for an ecosystem of Rust crates that target JavaScript environments with wasm-bindgen. Sharing a fo
We’ve just published the js-sys crate on crates.io! The js-sys crate contains raw #[wasm_bindgen] bindings to all the global APIs guaranteed to exist in every JavaScript environment by the ECMAScript standard. It does not contain bindings to any Web- or Node-specific APIs. With the js-sys crate, we can work with Objects, Arrays, Functions, Maps, Sets, etc… without writing the #[wasm_bindgen] impor
Rust and WebAssembly can combine in many delightful ways. To consolidate our efforts and have the largest, most-positive impact we can, the Rust and WebAssembly domain working group is focusing on one vision: Surgically inserting Rust compiled to WebAssembly should be the best choice for speeding up the most performance-sensitive JavaScript code paths. Do not throw away your existing code base, be
Hello and welcome to the first issue of This Week in Rust and WebAssembly! Rust is a systems language pursuing the trifecta: safety, concurrency, and speed. WebAssembly is designed as a portable target for compilation of high-level languages like C, C++, and Rust, enabling deployment on the web for client and server applications. This is a weekly summary of its progress and community. Tweet us at
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