First of all thanks a lot for the great video! I've been using optimistic hook for a while, but the custom hook that you've created seems to be quite handy! I would like to ask you, how would you manage the optimistic state on a like button? Would you pass the whole array of userIds that have liked to the hook or just some simple boolean "isLiked"? I'm still a new developer and I was passing the whole array of userIds that have liked some content, but doesn't seem to be the best practise as I'd be exposing all the userIds to the client, right?
If you want to display a counter you should do the math (count the userIds) on your server and only return the final number. Everything that is handled in the useOptimistic hook (as every other hook) is already client side. Your client value should just be the number and the optimistic update only do +1 to that number.
