How to return dynamic values from a function

Question

How to implement a function like this? <What_to_use_here> ?

func callfunc(type string) <What_to_use_here> {
    if type == "string"{
        return "I am a string"
     } else if type == "integer"{
       return 1
     }
    return nil
}

type Sample struct {
   value_int int
   value_str string
}

type Sample s
s.value_int = callFunc("integer")
s.value_str = callFunc("string")

I need to assign the value coming from the callFunc to a specified type as shown. So I think returning interface will not work. Need help.

Answer 1

type Sample struct {
    value_int int
    value_str string
}

func callFunc(typ string) interface{} {
    if typ == "string" {
        return "I am a string"
    } else if typ == "integer" {
        return 1
    }
    return nil
}

func main() {
    var s Sample
    s.value_int = callFunc("integer").(int)
    s.value_str = callFunc("string").(string)
    fmt.Println(s)
}

https://play.golang.org/p/QEPVMvAhkMQ