SRANDMEMBER command in redis

SRANDMEMBER key

Return a random element from a Set, without removing the element. If the Set is empty or the key does not exist, a nil object is returned.

TIME COMPLEXITY: O(1)

The SPOP command does similar work but the returned element is popped (removed) from the Set.

RETURN VALUE: Bulk reply

Syntax:

SRANDMEMBER key

Example

redis:6379> SADD redisKey 1 2 3 4 5 6 7 8
(integer) 8
redis:6379> SRANDMEMBER redisKey
"5"
redis:6379> SRANDMEMBER rediKey
(nil)
redis:6379> SRANDMEMBER redisKey
"8"