How about providing a sorted collection

[ss-torres]

Sorted set is a sorted collection, but it is double mapped. If we just want a collection that is ordered then the skiplist is enough. The skiplist could describe our purposes more precisely and it is quick and memory optimized also. How about that I add some commands to handle skiplist directly?

[ss-torres]

If I have a need to collect student information, the need is to collect student name and student score. I could collect student information with two map: <uid, name>, <uid, score>, then I could iterate student names and scores with two commands, rather than O(student number)。