CF.COUNT

Syntax text Syntax diagram API methods

CF.COUNT key item

Client:

count(
    key: str,  // The name of the Cuckoo filter
    item: str  // The item to count
) → int  // Number of times the item exists in the filter

CF.COUNT(
    key: RedisArgument,  // The name of the Cuckoo filter
    item: RedisArgument  // The item to count
) → number  // Number of times the item exists

cfCount(
    key: String,  // The name of the Cuckoo filter
    item: String  // The item to count
) → long  // Number of times the item exists

CFCount(
    ctx: context.Context,  // Context
    key: string,  // The name of the Cuckoo filter
    element: interface{}  // The item to count
) → *IntCmd  // Integer command result

Count(
    key: RedisKey,  // The name of the Cuckoo filter
    item: RedisValue  // The item to count
) → long  // Number of times the item exists

CountAsync(
    key: RedisKey,  // The name of the Cuckoo filter
    item: RedisValue  // The item to count
) → Task<long>  // Number of times the item exists

cfcount(
    $key: string,  // The name of the Cuckoo filter
    $item: mixed  // The item to count
) → int  // Number of times the item exists

Available in:: Redis Open Source / Bloom 1.0.0
Time complexity:: O(k), where k is the number of sub-filters
ACL categories:: @cuckoo, @read, @slow,
Compatibility:: Redis Software and Redis Cloud compatibility

Returns an estimation of the number of times a given item was added to a cuckoo filter.

If you just want to check that a given item was added to a cuckoo filter, use CF.EXISTS.

Required arguments

key

is key name for a cuckoo filter.

item

is an item to check.

Examples

Redis Software and Redis Cloud compatibility

Redis Software	Redis Cloud	Notes
✅ Supported	✅ Flexible & Annual ✅ Free & Fixed

Return information

RESP2 RESP3

One of the following:

Integer reply, where a positive value is an estimation of the number of times item was added to the filter. An overestimation is possible, but not an underestimation. 0 means that key does not exist or that item had not been added to the filter. See the note in CF.DEL.
Simple error in these cases: invalid arguments or wrong key type.