Can my Facebook friends see my comments in closed groups?

[Veritophilia]

By closed groups I mean groups that you need an invitation or granting from a moderator to access.

I don't want my friends to see what I write in groups.

[Sarah G.]

no they cant unless they are part of the group

[Barry]

As Sarah is saying here.
No one can see your comments in a closed group unless they're group members.

If the group was open then your friends could of course see your comments in their newsfeed.