goroutine

Syntax A sync.WaitGroup waits for a group of goroutines to finish. var wg sync.WaitGroup wg.Add(2) go func() { // Do work wg.Done() }() go func() { // Do work wg.Done() }() wg.Wait() First the main goroutine calls Add to set the number of goroutines to wait for. Then two new goroutines run and call Done when finished. At the same time, Wait is used to block until these two goroutines have finished. [Read More]

Syntax The select statement waits for multiple send or receive operations simultaneously. // Blocks until there's data available on ch1 or ch2 select { case <-ch1: fmt.Println("Received from ch1") case <-ch2: fmt.Println("Received from ch2") } The statement blocks as a whole until one of the operations becomes unblocked. If several cases can proceed, a single one of them will be chosen at random. Send and receive operations on a nil channel block forever. [Read More]