method

RedisClient.pfcount

...moreKeys: KeyLike[]

): Promise<number>;

Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s)

@param key

The first HyperLogLog key

@param moreKeys

Additional HyperLogLog keys (union cardinality)

@returns

Promise that resolves with the approximated number of unique elements

await redis.pfadd("hll", "a");
await redis.pfadd("hll", "b");
await redis.pfcount("hll"); // 2

Referenced types