Comment by masklinn

(2) has a bit more nuance to it: you can close channels… but the langage is designed for that to only be ok on single senders, a receiver can gracefully handle a closed channel (an iteration will just stop, a receive can use the 2-valued form to get the information), a sender will always straight up panic. Aka go channels are designed for fan-out.

And not closing channels is also considered idiomatic, per a tour of go:

> Channels aren't like files; you don't usually need to close them.