proper way of waiting for a go routine to finish

Question

I wish to know what is the proper way of waiting for a go routine to finish before exiting the program. Reading some other answers it seems that a bool chan will do the tric

Answer 1

Why the <- done works at all?

• It works because the runtime detects that you're writing something to the channel somewhere else.

what happens if I uncomment the last line?

• The runtime is smart enough to know that there's nothing else being written and it deadlocks.

Bonus, if you're extremely limited on memory, you can use done := make(chan struct{}) and done <- struct{}{}, struct{} is guaranteed to use 0 memory.