How can I hide my friend list.?

most of  us  dont  know how to  hide  friends
follow  this

1. First of all sign in to your Facebook account.
2. On the top-right of your page, click the “Account” Tab. Select the third option, “Privacy Settings”.
3. Click “View Settings” which is under the “Connecting on Facebook” label. Here you will find different settings in which you can configure how your friends can find and connect with you.

or  you like  to hide them in chat
 click chat  
click  on available chat