Check Go data type without using reflect

sample.go

package main

import "fmt"

type Actioner interface {
	Delete() string
}

type User struct {
	Name string
}

type Admin struct {
	Name string
}

func (User) Delete() string {
	return "user deleted"
}

func (Admin) Delete() string {
	return "admin deleted"
}

func GetObject() Actioner {
	return Admin{Name: "test"}
}

func main() {
	obj := GetObject()
	switch obj.(type) {
	case User:
		fmt.Println("User action:", obj.(User).Delete())
	case Admin:
		fmt.Println("Admin action:", obj.(Admin).Delete())
	default:
		fmt.Println("unknown type")
	}
}