map、切片和string之间的转换

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	var mp map[string]string
	mp = make(map[string]string)
	mp["hello"] = "world"
	mp["test"] = "json"
	// map to string
	mpByte, _ := json.Marshal(mp)
	mpStr := string(mpByte)
	fmt.Println(mpStr)

	// string to map
	var mpp map[string]string
	_ = json.Unmarshal([]byte(mpStr), &mpp)
	fmt.Printf("len: %d %s\n", len(mpp), mpp["hello"])

	sa := []string{"hello", "world"}
	// []string to string
	saByte, _ := json.Marshal(sa)
	saStr := string(saByte)
	fmt.Println(saStr)

	// string to []string
	var saa []string
	_ = json.Unmarshal([]byte(saStr), &saa)
	fmt.Printf("len: %d %v\n", len(saa), saa)

	// map[string]string to []string
	var sstr []string
	for k, v := range mp {
		tmp := fmt.Sprintf("%s=%s", k, v)
		sstr = append(sstr, tmp)
	}
	fmt.Println(sstr)
}

output

{"hello":"world","test":"json"}
len: 2 world
["hello","world"]
len: 2 [hello world]
[hello=world test=json]