While the type of the function shows information about it, in order to call a function, we need to use its value.

We will pass the function a list of argument values and get back the ones returned by the function call:

func main() {
    for _, f := range []interface{}{Foo, Bar, Baz, Qux} {
        v, t := reflect.ValueOf(f), reflect.TypeOf(f)
        name := runtime.FuncForPC(v.Pointer()).Name()
        in := make([]reflect.Value, t.NumIn())
        for i := range in {
            switch a := t.In(i); a.Kind() {
            case reflect.Int:
                in[i] = reflect.ValueOf(42)
            case reflect.String:
                in[i] = reflect.ValueOf("42")
            case reflect.Slice:
                switch a.Elem().Kind() {
                case reflect.Int:
                    in[i] = reflect.ValueOf(21)
                case reflect.String:
                    in[i] = reflect.ValueOf("21")
                }
            }
        }
        out := v.Call(in)
        fmt.Printf("%q %v%v
", name, in, out)
    }
}

A full example is available here: https://play.golang.org/p/jPxO_G7YP2I.