bf.exists

Determines if an item has been added to the bloom filter previously.

A bloom filter has two possible responses when you check if an item exists:

• 0 - The item definitely does not exist since with bloom filters, false negatives are not possible.

• 1 - The item exists with a given false positive (fp) percentage. There is an fp rate % chance that the item does not exist. You can create bloom filters with a more strict false positive rate as needed.

Examples

127.0.0.1:6379> BF.ADD key val
(integer) 1
127.0.0.1:6379> BF.EXISTS key val
(integer) 1
127.0.0.1:6379> BF.EXISTS key nonexistent
(integer) 0