gistfile1.go

package main

import (
        "sync"
	"time"
)

func main() {
	wg := new(sync.WaitGroup)
	for _, i := range []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} {
		wg.Add(1)
		go func(j int) {
			time.Sleep(time.Second * 1)
			println(j)
			wg.Done()
		}(i)
		if i%2 == 0 {
			wg.Wait()
		}
	}
}