WaitGroup is a great way to wait for a set of concurrent operations to complete when you either don’t care about the result of the concurrent operation, or you have other means of collecting their results. If neither of those conditions are true, I suggest you use channels and a select statement instead. WaitGroup is so useful, I’m introducing i…

waitgroup.go

package main

import (
	"fmt"
	"sync"
	"time"
)

func main() {
	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		defer wg.Done()
		fmt.Println("1st goroutine sleeping...")
		time.Sleep(1)
	}()

	wg.Add(1)
	go func() {
		defer wg.Done()
		fmt.Println("2nd goroutine sleeping...")
		time.Sleep(2)
	}()

	wg.Wait()
	fmt.Println("All goroutines complete.")
}