如何将interface {}转换为[] int？

Question

我在用Go语言进行编程。

假设有一个interface{}的变量，其中包含一个整数数组。我该如何将interface {}转换为[] int？

我试过 interface_variable，但出错了：

panic: interface conversion: interface is []interface {}, not []int

Answer 1

It's a []interface{} not just one interface{}, you have to loop through it and convert it:

http://play.golang.org/p/R441h4fVMw

func main() {
    a := []interface{}{1, 2, 3, 4, 5}
    b := make([]int, len(a))
    for i := range a {
        b[i] = a[i].(int)
    }
    fmt.Println(a, b)
}