Sample Wait Group usage in go

simplewaitgroup.go

package main

import "fmt"
import "sync"
import "time"

func main() {
	var wg sync.WaitGroup

	wg.Add(2)

	go func() {
		fmt.Println("Starting slow func")
		time.Sleep(3 * time.Second)
		wg.Done()
	}()

	go func() {

		fmt.Println("Starting fast func")
		wg.Done()
	}()

	for i := 0; i < 10; i++ {
		wg.Add(1)

		go func(i int) {
			fmt.Println("Goroutine", i, " here")
			wg.Done()
		}(i)

	}

	fmt.Println("Waiting")
	wg.Wait()
	fmt.Println("Done")
}