package main

import (
	"fmt"
	"math/rand"
	"sync"
	"time"
)

var numberList = []int{1, 2, 3, 4, 5}

func main() {
	var a sync.WaitGroup

	for _, v := range numberList {
		a.Add(1)
		go func() {
			defer a.Done()
			worker(v)
		}()
	}
	a.Wait()
}

func worker(id int) {
	fmt.Printf("Worker %v is starting\n", id)
	time.Sleep(time.Duration(rand.Intn(10) * int(time.Second)))
	fmt.Printf("Worker %v is done\n", id)
}