As you know, by default, Facebook keeps your friends list public and visible to every other Facebook user but you've got the choice of hiding it from other Facebook friends. Let's see how to hide friends list from Facebook friends.
Now, a user has control on almost everything in their profile (e.g. status, photos, albums etc). The user also has the control of how they want to share material (e.g. with everyone, friends, friends of friends, etc). Users can even manually hide a status from specific people.
If you don’t want strangers to see your friend list, then you can just hide it from them. It’s very easy. You can use the enhanced Facebook privacy settings to modify your friend list’s visibility.
One thing which I have noticed when you keep your friend list public is that many people see that list and start adding friends blindly.
And seeing common friends, other friends usually accept the friend request. It’s kind of embarrassing when your female friend informs you that some mutual friend of yours has sent her a friend request.
It’s better to let your friend list be visible only to you and hidden from others.
Note: People may see mutual friends when they visit your profile. Your friends also control who can see their friendships on their own profiles. If people can see your friendship on another profile, they'll also be able to see it in News Feed, search and other places on Facebook.Now, on your Facebook friend list page, simply click on the “Manage” icon at the top right & click on “Edit Privacy”.'
Smart Read:
From here you can control who can see your friend list and who can’t. I usually keep it visible to me only, as this is better for the privacy of my friends because I don’t want them to be bombarded with unlimited friend requests.
If you don’t want anyone to see your Facebook friend list, keep the “Who can see your friend list” setting to “Only Me”.
Conclusion
Now, a user has control on almost everything in their profile (e.g. status, photos, albums etc). The user also has the control of how they want to share material (e.g. with everyone, friends, friends of friends, etc). Users can even manually hide a status from specific people.
If you don’t want strangers to see your friend list, then you can just hide it from them. It’s very easy. You can use the enhanced Facebook privacy settings to modify your friend list’s visibility.
One thing which I have noticed when you keep your friend list public is that many people see that list and start adding friends blindly.
And seeing common friends, other friends usually accept the friend request. It’s kind of embarrassing when your female friend informs you that some mutual friend of yours has sent her a friend request.
It’s better to let your friend list be visible only to you and hidden from others.
How to Hide Facebook Friend List from Others
By default, everyone can see the Friends section of your profile. To adjust who can see your Friends section:
Go to your profile
Click Friends below your cover photo
Click 
at the top of the page and select Edit Privacy from the dropdown menu
at the top of the page and select Edit Privacy from the dropdown menu
Select an audience (ex: Friends, Public) to choose who you share your friend list with on your profile.
Note: People may see mutual friends when they visit your profile. Your friends also control who can see their friendships on their own profiles. If people can see your friendship on another profile, they'll also be able to see it in News Feed, search and other places on Facebook.Now, on your Facebook friend list page, simply click on the “Manage” icon at the top right & click on “Edit Privacy”.'
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From here you can control who can see your friend list and who can’t. I usually keep it visible to me only, as this is better for the privacy of my friends because I don’t want them to be bombarded with unlimited friend requests.
If you don’t want anyone to see your Facebook friend list, keep the “Who can see your friend list” setting to “Only Me”.
Conclusion
Keeping your Facebook friend list visible to other people is totally a thing of choice, but my humble suggestion would be to keep it hidden and private to you alone for the privacy of your true friends.