channel_for.go

func main() {
	var wg sync.WaitGroup
	channel := make(chan int)

	wg.Add(2)
	go sendToChannel(channel, &wg)
	go receiveFromChannel(channel, &wg)

	wg.Wait()
}

func sendToChannel(ch chan<- int, wg *sync.WaitGroup) {
	defer wg.Done()

	for i := 0; i < 10; i++ {
		ch <- i
	}
	close(ch)
}

func receiveFromChannel(ch <-chan int, wg *sync.WaitGroup) {
	defer wg.Done()

	for msg := range ch {
		fmt.Println(msg)
	}
}