package main

import (
	"encoding/json"
	"fmt"
)

type A struct {
	Name string
}

type B struct {
	City string
}

func main() {
	ab := []interface{}{}

	a := A{"HUHU"}
	ab = append(ab, a)
	b := B{"ShangHai"}
	ab = append(ab, b)

	fmt.Println(ab)

	// range
	for k, v := range ab {
		fmt.Println(k, v)

		fmt.Printf("%T\n", v)

		switch v.(type) {
		case A:
			fmt.Println(v.(A).Name)
		case B:
			fmt.Println(v.(B).City)
		}

	}

	// interface to json byte
	buf, err := json.Marshal(ab)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(string(buf))

	// json byte to interface
	it := []interface{}{}
	json.Unmarshal(buf, &it)

	fmt.Println(it)

	// range
	for k, v := range it {
		fmt.Println(k, v)

		if rec, ok := v.(map[string]interface{}); ok {
			for key, val := range rec {
				fmt.Println(key, val)
			}
		}

	}

	fmt.Println("Hello, 世界")

}