Go 1.25.0

1.txt

# Update go 1.25
$go env -w GOTOOLCHAIN=go1.25.0
$go version
go version go1.25.0 darwin/arm64

# เปิด Go doc
$go doc -http                  
doc: Documentation server listening on addr http://localhost:61699

2.txt

$GOEXPERIMENT=jsonv2 go test -bench=. -benchmem  -count=3

goos: darwin
goarch: arm64
pkg: demo
cpu: Apple M2 Max
BenchmarkJsonV1Unmarshal-12    	 1884603	       619.5 ns/op	     128 B/op	       3 allocs/op
BenchmarkJsonV1Unmarshal-12    	 1927093	       616.4 ns/op	     128 B/op	       3 allocs/op
BenchmarkJsonV1Unmarshal-12    	 1927429	       619.1 ns/op	     128 B/op	       3 allocs/op
BenchmarkJsonV2Unmarshal-12    	 2390827	       504.4 ns/op	     128 B/op	       3 allocs/op
BenchmarkJsonV2Unmarshal-12    	 2394787	       503.7 ns/op	     128 B/op	       3 allocs/op
BenchmarkJsonV2Unmarshal-12    	 2309986	       503.6 ns/op	     128 B/op	       3 allocs/op
PASS
ok  	demo	10.824s

demo-jsonv2.go

package demo_test

import (
	"testing"

	jsonv1 "encoding/json"
	jsonv2 "encoding/json/v2"
)

type User struct {
	ID      int      `json:"id"`
	Name    string   `json:"name"`
	Email   string   `json:"email"`
	Tags    []string `json:"tags"`
	Active  bool     `json:"active"`
	Created int64    `json:"created"`
}

var data = []byte(`{"id":1,"name":"Name 01","email":"[email protected]","tags":["tag1","tag2"],"active":true,"created":1625251200}`)

func BenchmarkJsonV1Unmarshal(b *testing.B) {
	for range b.N {
		var u User
		_ = jsonv1.Unmarshal(data, &u)
	}
}

func BenchmarkJsonV2Unmarshal(b *testing.B) {
	for range b.N {
		var u User
		_ = jsonv2.Unmarshal(data, &u)
	}
}

demo-waitgroup.go

package main

import (
	"fmt"
	"sync"
)

var wg sync.WaitGroup

func main() {

    wg.Go(func() {
        fmt.Println("Process 1")
    })

    wg.Go(func() {
        fmt.Println("Process 2")
    })

    wg.Wait()

    fmt.Println("Finished all processes")
}