control_goroutines_2.go

func main() {
	naturals := make(chan int)
	squares := make(chan int)

	//Counter
	//implicit conversion
	go counter(naturals)

	//Squarer
	//implicit conversion
	go square(naturals, squares)

	for s := range squares {
		fmt.Println(s)
	}
}

func counter(into chan<- int){
	for x := 0; x < 10; x++ {
		into <- x
	}
	close(into)
}

//from = receive-only channel of int
//into = send-only channel of int
func square(from <-chan int, into chan<- int) {
	for x := range from {
		into <- x * x
	}
	close(into)
}