method

RedisClient.zunion

numkeys: number,

...args: [...args: string | number[], withscores: 'WITHSCORES']

): Promise<[string, number][]>;

Compute the union of multiple sorted sets

Returns the union of the sorted sets given by the specified keys. For every element that appears in at least one of the input sorted sets, the output will contain that element.

Options:

WEIGHTS: Multiply the score of each member in the corresponding sorted set by the given weight before aggregation
AGGREGATE SUM|MIN|MAX: Specify how the scores are aggregated (default: SUM)
WITHSCORES: Include scores in the result

@param numkeys

The number of input keys (sorted sets)

@returns

Promise that resolves with an array of members (or members with scores if WITHSCORES is used)

// Set up sorted sets
await redis.zadd("zset1", "1", "a", "2", "b", "3", "c");
await redis.zadd("zset2", "4", "b", "5", "c", "6", "d");

// Basic union
const members1 = await redis.zunion(2, "zset1", "zset2");
// Returns: ["a", "b", "c", "d"]

// With weights
const members2 = await redis.zunion(2, "zset1", "zset2", "WEIGHTS", "2", "3");
// Returns: ["a", "b", "c", "d"] with calculated scores

// With MIN aggregation
const members3 = await redis.zunion(2, "zset1", "zset2", "AGGREGATE", "MIN");
// Returns: ["a", "b", "c", "d"] with minimum scores

// With scores
const withScores = await redis.zunion(2, "zset1", "zset2", "WITHSCORES");
// Returns: ["a", "1", "b", "2", "c", "3", "d", "6"] (alternating member and score)

zunion(