Hi, author of the post here. Which example doesn't work? I just pasted the communicate by sharing memory example into the go playground: https://play.golang.org/p/bWtyGTC-EsC and it gives the same length every time. Am I missing something or are you referring to a different example?

> More on-topic, channels have their own tradeoffs. I often reach for WaitGroups and mutexes instead of channels, because things can get complicated fast when you're routing data around with channels

You're absolutely right. I certainly didn't intend to give a blanket recommendation. It's more of a, "If you're sharing memory, might it become clearer if you share memory by communicating?" I was worried that the simplistic examples would not properly represent the cases I was thinking of. I think that's a communication error on me.