partial JSON unmarshal to go struct

partial_json_to_struct.go

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	var err error
	myJson := []byte(`{"name":  "Natan", "age":  27, "hobbies":  ["programming", "inline_skatting"], "is_millionaire":  false}`)
	m := make(map[string]json.RawMessage)
	if err := json.Unmarshal(myJson, &m); err != nil {
		panic(err)
	}
	
	// partially unmarshall json to struct and keeps remaining data
	var myStruct struct {
		Name string `json:"name"`
		Age  int    `json:"age"`
		json.RawMessage
	}
	get(&myStruct.Name, m, "name")
	get(&myStruct.Age, m, "age")
	myStruct.RawMessage, err = json.Marshal(m)
	if err != nil {
		panic(err)
	}
	fmt.Println(myStruct)
}

func get(to interface{}, m map[string]json.RawMessage, s string) {
	if err := json.Unmarshal(m[s], &to); err != nil {
		panic(err)
	}
	delete(m, s)
}