component4

inline operator fun FriendInfo.component4(): String?

FriendInfo 的解构扩展第4个属性,相当于 FriendInfo.remark

前三个属性来自于 UserInfo

val (id, username, avatar, remark) = friendInfo

inline operator fun MemberInfo.component4(): String

MemberInfo 属性解构扩展,第4个属性,相当于 MemberInfo.nickname

val (id, username, avatar, nickname) = memberInfo

前三个属性的解构扩展来自于 UserInfo