删除Gota系列的重复值

Question

I have a simple gota series and I want to remove duplicate from it. how it is possible in go?

func main() {

    new_series := series.New([]string{"b", "a", "c", "a", "d", "b"}, series.String, "COL.1")
    fmt.Println(new_series)
}

[b a c a d b]

expected: [b a c d]

Answer 1

To represent a unique set of elements in go, use a map.

So to create a unique set of strings from a given list, use something like:

func setFromList(list []string) (set []string) {
    ks := make(map[string]bool) // map to keep track of repeats

    for _, e := range list {
        if _, v := ks[e]; !v {
            ks[e] = true
            set = append(set, e)
        }
    }
    return
}

and to apply this to an existing gota.Series:

func uniqueGotaSeries(s series.Series) series.Series {
    return series.New(setFromList(s.Records()), s.Type(), s.Name)
}

Working playground example: https://play.golang.org/p/zqQM-0XxLF5

Output:

Orig: [b a c a d b]
Unique: [b a c d]