Remove a random element from a Set returning it as return value. If the Set is empty or the key
does not exist, a nil object is returned.
<p>
The {@link #srandmember(string)} command does a similar work but the returned element is not
removed from the Set.
<p>
Time complexity O(1)
@param key
@return Bulk reply
Remove a random element from a Set returning it as return value. If the Set is empty or the key does not exist, a nil object is returned. <p> The {@link #srandmember(string)} command does a similar work but the returned element is not removed from the Set. <p> Time complexity O(1) @param key @return Bulk reply