If you hide your friend list then your friend will be able to see mutual friends only, also if someone hides their friend list same thing applies to you.
No wonder Facebook is the biggest social network as of today with over a billion of users across the world, and Facebook is getting smarter and smarter day by day, it get updates around in every month, security and privacy for user’s profile, one of the privacy feature added by Facebook lately is to hide your friend list even from your friends.
