map函数和第一个if语句不起作用.如果所选用户的id已经存在于当前用户的朋友数组中，我想将friend设置为true.

const currentProfile = users.filter((user) => user._id === id)[0]; //the selected profile
const currentUser = useSelector((state) => state.currentUserReducer); // user logged in
useEffect(() => {
  if (currentUser) {
    // not working
    //currentUser?.result?.friends is an array of objects containing id of all friends added
    currentUser?.result?.friends.map((friends) => {
      //not working
      if (friends._id === currentProfile._id) {
        return setFriend(true);
      }
    });
  } else {
    return setFriend(false);
  }
}, [currentUser, currentProfile]);