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WebAssembly (Wasm) is an universal low level bytecode that runs on the web. It is a compilation target for languages like Rust, AssemblyScript (Typescript-like), Emscripten (C/C++), and much more! Wasm offer a compact binary format with predictable performance, and portability to run alongside Javascript and other host languages. Wasm is currently shipped in all major browsers, and has runtimes meant for running on servers or interfacing with systems using WASI.

What is Wasm By Example?

Wasm By Example is a concise, hands-on introduction to WebAssembly using code snippets and annotated WebAssembly example programs. Learn more about Wasm at the WebAssembly Introduction or browse the list of examples below.

Examples

Concepts

Examples that express some of the major underlying concepts in WebAssembly. Some of these examples are not the most convenient or productive way for building projects with WebAssembly. However, these minimal examples are great for learning, or developing straightforward / lower-level parts of an application.

• Introduction
• Introdução
• Hello World!
• Hello World!
• Hello World!
• Hello World!
• Olá, Mundo
• Exports
• Exports
• Exports
• Exports
• WebAssembly Linear Memory
• WebAssembly Linear Memory
• WebAssembly Linear Memory
• A Memória Linear do WebAssembly
• Importing Javascript Functions Into WebAssembly
• Importing Javascript Functions Into WebAssembly
• Importing Javascript Functions Into WebAssembly
• Como Importar Funções do Javascript Em WebAssembly

Applying the Concepts

Examples that expand on the conceptual examples to show how these minimal examples could be used to build common features in larger applications.

• Reading and Writing Graphics
• Reading and Writing Graphics
• Reading and Writing Graphics
• Como Ler e Escrever Gráficos
• Reading and Writing Audio
• Reading and Writing Audio
• Reading and Writing Audio
• Como Ler e Escrever Áudio

Ecosystem tools and Language features

Examples that highlight tools, libraries, and features of your selected programming language. These ecosystem components can drastically help in building powerful applications. For example, tools can be used to help pass data between your host runtime and WebAssembly module, and/or languages features can abstract away some of the lower-level parts of WebAssembly such as memory management.

• Passing High Level Data Types with `wasm-bindgen`
• Passando Tipos de Dados de Alto Nível com o `wasm-bindgen`
• Passing High Level Data Types with `as-bind`
• Strings
• Classes

WebAssembly Outside of the Browser

Examples that highlight the WebAssembly System Interface (WASI), standalone WebAssembly runtimes, tools for applications that use WASI, and use cases for tasks like cloud computing and internet-of-things devices. WebAssembly has a lot of key features that make it great for the browser web, and these same features make it a popular choice for uses outside of the browser as well.

• WASI Introduction
• Introdução à WASI
• WASI Hello World
• WASI Hello World
• Olá, Mundo com WASI
• WASI Hello World

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