func Crawl(url string, depth int, fetcher Fetcher, crawled *Crawled) {
	// TODO: Fetch URLs in parallel.
	// TODO: Don't fetch the same URL twice.
	// This implementation doesn't do either:
	if crawled.IsCrawled(url) {
		return
	}
	if depth <= 0 {
		return
	}
	body, urls, err := fetcher.Fetch(url)
	if err != nil {
		fmt.Println(err)
		return
	}
	crawled.Add(url)
	fmt.Printf("found: %s %q\n", url, body)
	for _, u := range urls {
		go Crawl(u, depth-1, fetcher, crawled)
	}
	return
}
// Crawl uses fetcher to recursively crawl
// pages starting with url, to a maximum of depth.
Crawl uses fetcher to recursively crawl
pages starting with url, to a maximum of depth.
// Crawl uses fetcher to recursively crawl // pages starting with url to a maximum of depth .
func Crawl(url string, depth int, fetcher Fetcher, crawled *Crawled) {
	if crawled.IsCrawled(url) {
		return
	}
	if depth <= 0 {
		return
	}
	body, urls, err := fetcher.Fetch(url)
	if err != nil {
		fmt.Println(err)
		return
	}
	crawled.Add(url)
	fmt.Printf("found: %s %q\n", url, body)
	for _, u := range urls {
		go Crawl(u, depth-1, fetcher, crawled)
	}
	return
}
func Crawl ( url string , depth int , fetcher Fetcher , crawled * Crawled ) { if crawled . IsCrawled ( url ) { return } if depth <= 0 { return } body , urls , err := fetcher . Fetch ( url ) if err != nil { fmt . Println ( err ) return } crawled . Add ( url ) fmt . Printf ( " \n " , url , body ) for _ , u := range urls { go Crawl ( u , depth - 1 , fetcher , crawled ) } return }
Crawl uses fetcher to recursively crawl
pages starting with url, to a maximum of depth.
Crawl uses fetcher to recursively crawl pages starting with url to a maximum of depth .
// TODO: Fetch URLs in parallel. // TODO: Don't fetch the same URL twice. // This implementation doesn't do either: