advanced-go-programming-book/examples/ch3.8/ch3.8-6/main.go

package main

import (
	"fmt"
	"sync"

	"gobook/ch3.8-6/gls"
)

func main() {
	var wg sync.WaitGroup
	for i := 0; i < 5; i++ {
		wg.Add(1)
		go func(idx int) {
			defer wg.Done()
			defer gls.Clean()

			defer func() {
				fmt.Printf("%d: number = %d\n", idx, gls.Get("number"))
			}()
			gls.Put("number", idx+100)
		}(i)
	}
	wg.Wait()
}