Method ZRevRange

structure/zset.go:834–848

ZRevRange retrieves a range of elements from a sorted set (ZSet) in descending order. Inputs: - key: Name of the ZSet - startRank: Initial rank of the desired range - endRank: Final rank of the desired range Output: - An array of ZSetValue, representing elements from the range [startRank, endRank]

(key string, startRank int, endRank int)

//   - Error if an issue occurs, such as when the key is empty or ZSet retrieval fails
//     error
func (zs *ZSetStructure) ZRevRange(key string, startRank int, endRank int) ([]ZSetValue, error) {
	if err := checkKey(key); err != nil {
		return nil, err
	}
	keyBytes := stringToBytesWithKey(key)

	zSet, err := zs.getZSetFromDB(keyBytes)
	if err != nil {
		return nil, err
	}
	r := zSet.skipList.getRange(startRank, endRank, true)

	// rank zero means no rank found
	return r, nil
}

// The ZCard function returns the size of the dictionary of the sorted set stored at key in the database.
// It takes a string key as an argument.