package main 
import (
 "fmt"
 "reflect"
)
 
type A struct {
 s string
}
 
func main() {
 
 a1 := A{s: "abc"}
 a2 := A{s: "abc"}
 if reflect.DeepEqual(a1, a2) {
  fmt.Println(a1, "==", a2)
 }
 
 b1 := []int{1, 2}
 b2 := []int{1, 2}
 if reflect.DeepEqual(b1, b2) {
  fmt.Println(b1, "==", b2)
 }
 
 c1 := map[string]int{"a": 1, "b": 2}
 c2 := map[string]int{"a": 1, "b": 2}
 if reflect.DeepEqual(c1, c2) {
  fmt.Println(c1, "==", c2)
 }
}

func Contain(obj interface{}, target interface{}) (bool, error) {
 targetValue := reflect.ValueOf(target)
 switch reflect.TypeOf(target).Kind() {
 case reflect.Slice, reflect.Array:
 for i := 0; i < targetValue.Len(); i++ {
 if targetValue.Index(i).Interface() == obj {
 return true, nil
 }
 }
 case reflect.Map:
 if targetValue.MapIndex(reflect.ValueOf(obj)).IsValid() {
 return true, nil
 }
 } 
 return false, errors.New("not in array")
}