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.
<p>
The SPOP command does a similar work but the returned element is popped (removed) from the Set.
<p>
Time complexity O(1)
@param key
@return Bulk reply
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. <p> The SPOP command does a similar work but the returned element is popped (removed) from the Set. <p> Time complexity O(1) @param key @return Bulk reply