BF.CARD

BF.CARD

BF.CARD key

Available in:

Redis Stack / Bloom 2.4.4

Time complexity:

O(1)

Returns the cardinality of a Bloom filter - number of items that were added to a Bloom filter and detected as unique (items that caused at least one bit to be set in at least one sub-filter)

(since RedisBloom 2.4.4)

Parameters

• key: The name of the filter

Return

• Integer reply - the number of items that were added to this Bloom filter and detected as unique (items that caused at least one bit to be set in at least one sub-filter).
• 0 when key does not exist.
• Error when key is of a type other than Bloom filter.

Note: when key exists - return the same value as BF.INFO key ITEMS.

Examples

redis> BF.ADD bf1 item_foo
(integer) 1
redis> BF.CARD bf1
(integer) 1
redis> BF.CARD bf_new
(integer) 0