Sync Package - Wait Group

main.go

package main

import (
	"fmt"
	"sync"
	"time"
)

func main() {
	wg := sync.WaitGroup{}

	wg.Add(2)

	go func() {
		time.Sleep(500 * time.Millisecond)
		greeter("routine A")
		wg.Done()
	}()

	go func() {
		time.Sleep(200 * time.Millisecond)
		greeter("routine B")
		wg.Done()
	}()

	wg.Wait()
	fmt.Println("All members in the group are done")
}

func greeter(s string) {
	fmt.Println(s)
}