Summary - WASM and embedded

Combine WASM and TinyGo to write a platform analysis.

WASM and embedded summary

Go produces very different targets from the same code: the browser with GOOS=js GOARCH=wasm, WASI runtimes with GOOS=wasip1, embedded Linux with GOOS=linux GOARCH=arm, and microcontrollers with TinyGo. Target-specific code is separated with //go:build and file suffixes; business logic stays shared in pure functions.

An architecture tip

In a multi-target project split the code in three: the core (pure Go, side-effect-free, builds for every target), adapters (target-specific: syscall/js, os, machine) and entry points (a separate main per target). The core is tested with ordinary go test; hardware and browser stay only in the thin adapter layer.

Exercise Shared core

Write a pure core that runs on every target: ortalama(olcum []float64) float64 returns 0 for an empty slice. Pass the result to fmt.Println through func yaz(f func(string), v float64), which imitates an adapter. Run it for []float64{20, 22, 24}.

Show example solution

package main

import "fmt"

func ortalama(olcum []float64) float64 {
    if len(olcum) == 0 {
        return 0
    }
    t := 0.0
    for _, v := range olcum {
        t += v
    }
    return t / float64(len(olcum))
}

func yaz(f func(string), v float64) {
    f(fmt.Sprintf("%.1f", v))
}

func main() {
    yaz(func(s string) { fmt.Println(s) }, ortalama([]float64{20, 22, 24}))
}

Test yourself

If a Go module under 200 KB is needed in the browser, which is chosen?
- cgo
- GOOS=wasip1
- WASM with TinyGo
- WASM with standard Go
Show answer

WASM with TinyGo — Standard Go WASM output is MB-sized because of the runtime; TinyGo can produce modules of tens of KB.

WASI target

GOOS=____ GOARCH=wasm go build -o app.wasm

Show answer

GOOS=wasip1 GOARCH=wasm go build -o app.wasm

Group summary

js/wasm

Browser
wasip1/wasm

Wasmtime, Wasmer
linux/arm

Embedded Linux
TinyGo

Microcontroller

Next lesson: Challenge 1 - Scheduler

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