s := zset.New()
// add data
s.Set(66, 1001, "test1")
s.Set(77, 1002, "test2")
s.Set(88, 1003, "test3")
s.Set(100, 1004, "liyiheng")
s.Set(99, 1005, "test4")
s.Set(44, 1006, "test5")
// update data
s.Set(44, 1001, "test1")

// get rank by id
rank, score, extra := s.GetRank(1004, false)
// get data by rank
id, score, extra := s.GetDataByRank(0, true)
// get data by id
dat, ok := s.GetData(1001)

// delete data by id
s.Delete(1001)

// Increase score
s.IncrBy(5.0, 1001)

// ZRANGE, ASC
five := make([]int64, 0, 5)
s.Range(0, 5, func(score float64, k int64, _ interface{}) {
	five = append(five, k)
})

// ZREVRANGE, DESC
all := make([]int64, 0)
s.RevRange(0, -1, func(score float64, k int64, _ interface{}) {
	all = append(all, k)
})