zscan | zscan 是结合 zxing zbar 两者的优点，实现的快速且稳定的摄像头扫码器，支持扫描二维码 | QRCode Processing library

When I have a sorted set with scores, I'd like to have the right rank even when multiple items have the same score.

For instance, when there are 5 items with scores: 1, 2, 2, 2, 3, I'd like to have those three central items to have the same rank (1), while the highest score gets rank 0 (with ZREVRANGE), and the lowest gets rank 4.

I see that it's possible to query the amount of keys with the same score somewhat efficiently O(log(N)), but it looks like if I want to have the scores as I want them, I'd have to use zscan, which is O(N).

Edit: add complete example based on the accepted solution

Our dataset is a sorted set with scores. For example: a has score 1, b, c and d have score 2, and e has score 3:

I am writing a Lua script to execute in redis. I am working with Sorted Sets that look like this:

Member: 96954_1_1557705600 Score: 1557705600

The score is a unix epoch time stamp.

I would like to first get the results that are between two time stamps, then filter those based of a glob pattern in the member. Something like MATCH *_1_*.

My script looks like this, but it's failing when I try and pass the Lua table to zscan:

local start_date = KEYS[1] local end_date = KEYS[2] local limited_by_date = redis.call('zrangebyscore','rooms', start_date, end_date) return redis.call('zscan', unpack(limited_by_date), 'match *_1_*')

limited_by_date correct contains the values I expect, but how can I search through them with zscan now?

I am using stackexchange.redis. in that zscan is giving all matched value
I want to get exactly given page size result and next cursor for remaining values.

I have debugged its source code library in that i found that they are scanning entire source value until cursor became zero and provides all matched values.

so could we can get result as per cursor same as redis command Zscan.

here is my code snap

I'm using node redis to connect to redis.

The zscan function provided by redis does not return elements in order. I was wondering if there's a javascript library that helps me do that.