Learning Functional Programming in Go

All requests done

When the WaitGroup counter reaches zero, wg.Wait() is unblocked and the processing continues to the next line, where we pass an instance of the empty struct to stopChan. As we've seen previously, stopChan signals to the displayProgress method of Job to stop processing:

        stopChan <- struct{}{}       Debug.Printf("All requests done.")       close(j.responseChan)}

Lastly, we use our Debug logger to print All requests done. and close responseChan of Job.