SISMEMBER key member

Available since 1.0.0.

Time complexity: O(1)

Returns if member is a member of the set stored at key.

*Return value

Integer reply, specifically:

  • 1 if the element is a member of the set.
  • 0 if the element is not a member of the set, or if key does not exist.

*Examples

redis>  SADD myset "one" 
(integer) 1
redis>  SISMEMBER myset "one" 
(integer) 1
redis>  SISMEMBER myset "two" 
(integer) 0
redis> 
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