如何从 []interface{} 转换为 []int？

Question

我想获得非重复的 []int。我正在使用set，但我不知道如何[]int从set. 我怎样才能做到这一点？package mainimport (    "fmt"    "math/rand"    "time"    "github.com/deckarep/golang-set")func pickup(max int, num int) []int {    set := mapset.NewSet()    rand.Seed(time.Now().UnixNano())    for set.Cardinality() < num {        n := rand.Intn(max)        set.Add(n)    }    selected := set.ToSlice()    // Do I need to cast from []interface{} to []int around here?    // selected.([]int) is error.    return selected}func main() {    results := pickup(100, 10)    fmt.Println(results)    // some processing using []int...}

Answer 1

没有自动的方法来做到这一点。您需要创建一个 int 切片并将其复制到其中：

selected := set.ToSlice()

// create a secondary slice of ints, same length as selected

ret := make([]int, len(selected))

// copy one by one

for i, x := range selected {

   ret[i] = x.(int) //provided it's indeed int. you can add a check here

}

return ret