Learn ASSEMBLYSCRIPT with Real Code Examples

Install Node.js (14+ recommended)

Install AssemblyScript via `npm install --save-dev assemblyscript`

Install CLI `asc` with `npx asc` or globally

Initialize project with `npx asinit .`

Compile code with `npx asc index.ts -b index.wasm -t index.wat`

Install Node.js 14+

Install AssemblyScript via npm

Initialize project with `asinit`

Compile and test functions locally

Load `.wasm` in browser, Node.js, or blockchain runtime

asconfig.json - AssemblyScript project configuration

assembly/ - source files

build/ - compiled .wasm binaries

package.json - project dependencies and scripts

test/ - unit tests with as-pect

npx asc index.ts -b index.wasm -> compile to Wasm

npx asinit . -> initialize AssemblyScript project

npx as-pect test -> run tests

memory.grow(n) -> increase Wasm memory

WebAssembly.instantiateStreaming(fetch('index.wasm')) -> load in JS

UTF-8 string handling supported

Localization handled in host environment

Memory-based string management for multiple locales

Interop with JS localization libraries

Wasm modules themselves are locale-neutral

Accessible via JS or runtime APIs

WebAssembly modules run in sandbox

Cross-platform: browser, Node.js, blockchain

Integrates with front-end frameworks

Supports JSON or numeric outputs to host

No native UI - used as backend logic or computation module

Integration with web UI via JS host

Visualization handled in host environment

Debugging via console logs in host

Browser-based debugging tools available for Wasm

Stateless by default unless using linear memory

Memory buffer can store persistent data across calls

Garbage collection optional via runtime

Interop with JS can maintain state externally

Durable state management handled outside AssemblyScript in host

Pass numeric, string, and array data via Wasm memory

Use memory offsets for efficient storage

Interop with JS or blockchain runtime for I/O

No file system access directly

Data must fit into linear memory or host-provided storage