Goroutine SecondCounter Channel Sync

gistfile1.go

package main

import (
	"fmt"
	"time"
)

var done chan bool = make(chan bool)

func SecondCounter() {
	for i := 1; i <= 20; i++ {
		time.Sleep(1 * time.Second)
		fmt.Println(i)
	}
	done <- true
}

func main() {
	go SecondCounter()
	<-done
}