Learn GO-WASM with Real Code Examples

Go-WASM allows Go developers to write web client logic in Go instead of JavaScript.

The compiled WebAssembly module executes Go code in the browser runtime.

Supports interaction with JavaScript via the `syscall/js` package.

Can leverage Go's goroutines for concurrent tasks in browser applications.

Enables building SPAs, games, or computational-heavy browser apps using Go.

Go compiler target `wasm`

`syscall/js` package for JS interop

Goroutines for concurrent tasks

Go modules and package system for browser apps

Integration with Go’s memory and type safety

WASM target - compile Go to WebAssembly

`syscall/js` - bridge between Go and JS

Goroutines - lightweight concurrent tasks

Channels - communicate between goroutines

Event handling - DOM events triggered via JS interop

main.go - entry point

pkg/ - reusable Go packages

static/ - HTML/JS/asset files for WASM loading

wasm_exec.js - Go-provided loader script

index.html - HTML template for mounting WASM module

Write Go code for browser logic

Use `syscall/js` to interact with DOM/JS

Compile Go to WASM

Load WASM via HTML and JavaScript shim

Test, debug, and iterate in the browser

Beginner: simple counter or calculator in Go-WASM

Intermediate: SPA with DOM manipulation

Advanced: browser-based data processing using goroutines

Expert: integrate Go frontend with Go backend seamlessly

Auditor: optimize WASM binary size and runtime efficiency

Go-WASM vs JavaScript: Strong typing, concurrency vs native JS runtime

Go-WASM vs Rust-WASM: Go easier for concurrency; Rust better memory control

Go-WASM vs AssemblyScript: Go has goroutines, larger binaries; AS is lighter

Go-WASM vs C++/Emscripten: Go simpler syntax; C++ more performance-tuned

Go-WASM vs Blazor WASM: Go language vs C#, smaller ecosystem

2018 – Initial experimental Go-WASM support

2019 – Official Go 1.11 WASM target introduced

2020 – Standard library support stabilized

2022 – Performance improvements and wasm_exec.js updates

2023–2025 – Continuous runtime optimizations and bug fixes

WebAssembly (WASM) - binary format to run code in browsers

syscall/js - Go package to interact with JS and DOM

Goroutine - lightweight concurrent function in Go

Channel - communication mechanism between goroutines

Loader script - JS script to bootstrap Go runtime in browser