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set

类似java中的hashset

  • 无序
  • 不可重复
  • 查找快
  • 支持交集，并集，差集(好友共同关注)

常用命令​

  • sadd
  • sismember: Determines whether a member belongs to a set.
  • srem
  • scrad: Returns the number of members in a set.
  • smembers: Returns all members of a set.
  • sinter: Returns the intersect(交叉，交集) of multiple sets
  • sdiff: Returns the difference差集 of multiple sets.
  • sunion: Returns the union并集 of multiple sets.