I'm a freshman. I went through the Tour of GO smoothly today, until I
encountered "Exercise: Web Crawler". The exercise is at here
https://tour.golang.org/concurrency/10 .
This exercise requires me to implement a concurrent crawler. I write a main
function like this:
> func main() {
> go Crawl("http://golang.org/";, 4, fetcher)
> }
Yes, the program terminated just after it created the goroutine, nothing
was printed. I thought the program would wait for all goroutines to finish
without explicit coding, but it didn't. The canonical way to do this is to
use WaitGroup, but the tutorial omitted it. I think it should be added
before this exercise.
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