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Video:

WaitGroups in Go

June 24, 2021

Course Instructor: Elliot Forbes

Hey Gophers! My name is Elliot and I'm the creator of TutorialEdge and I've been working with Go systems for roughly 5 years now.

In this video, we are going to be looking at WaitGroups in Go and what they are used for.

Overview

package main

import (
	"fmt"
	"net/http"
	"sync"
)

var urls = []string{
	"https://google.com",
	"https://twitter.com",
	"https://tutorialedge.net",
}

func fetch(url string, wg *sync.WaitGroup) {
	resp, err := http.Get(url)
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(resp.Status)
	wg.Done()
}

func crawl() {
	var wg sync.WaitGroup

	for _, url := range urls {
		wg.Add(1)
		go fetch(url, &wg)
	}
	wg.Wait()
	fmt.Println("finished crawling urls")
}

func main() {
	crawl()
}

Output

$ go run main.go
200 OK
200 OK
200 OK
finished crawling urls