I know that generics are coming to go, but before that, I want to know what is the most acceptable way of mimicking it in go? I have this code that randomly selects selCnt numbers of elements from the slice. In my example, it is a slice of []Question

// genRndArray Get selCnt count of random elements from the slice of Questions
func genRndElm(s []Question, selCnt int) []Question {
    var sel []Question
    rand.Seed(time.Now().UnixNano())
    for _, n := range rand.Perm(len(s))[:selCnt] {
        for i, el := range s {
            if i == n {
               sel = append(sel, el)
            }
        }
    }

    return sel
}

Now I have to apply the same functionality to the slice of []Announcement. So what is the most effective or acceptable way of accomplishing it?

CodePudding user response：

You can use a function variable:

func genRndElm(s, selCnt int,f func(int)) {
    rand.Seed(time.Now().UnixNano())
    for _, n := range rand.Perm(s)[:selCnt] {
        f(n)
    }
}


...
selected:=make([]Question,0)
genRndElm(len(questions), selCnt, func(n int) {
    selected=append(selected,questions[n])
})

CodePudding user response：

can you use interface as input/out type