I’ve the below code:
package main
import (
"bytes"
"fmt"
"reflect"
"strconv"
"strings"
)
type User struct {
Name string `name`
Age int64 `age`
}
func main() {
var u User = User{"bob", 10}
res, err := JSONEncode(u)
if err != nil {
panic(err)
}
fmt.Println(string(res))
}
func JSONEncode(v interface{}) ([]byte, error) {
refObjVal := reflect.ValueOf(v)
refObjTyp := reflect.TypeOf(v)
buf := bytes.Buffer{}
if refObjVal.Kind() != reflect.Struct {
return buf.Bytes(), fmt.Errorf(
"val of kind %s is not supported",
refObjVal.Kind(),
)
}
buf.WriteString("{")
pairs := []string{}
for i := 0; i < refObjVal.NumField(); i++ {
structFieldRefObj := refObjVal.Field(i)
structFieldRefObjTyp := refObjTyp.Field(i)
switch structFieldRefObj.Kind() {
case reflect.String:
strVal := structFieldRefObj.Interface().(string)
pairs = append(pairs, `"`+string(structFieldRefObjTyp.Tag)+`":"`+strVal+`"`)
case reflect.Int64:
intVal := structFieldRefObj.Interface().(int64)
pairs = append(pairs, `"`+string(structFieldRefObjTyp.Tag)+`":`+strconv.FormatInt(intVal, 10))
default:
return buf.Bytes(), fmt.Errorf(
"struct field with name %s and kind %s is not supprted",
structFieldRefObjTyp.Name,
structFieldRefObj.Kind(),
)
}
}
buf.WriteString(strings.Join(pairs, ","))
buf.WriteString("}")
return buf.Bytes(), nil
}
It works perfectly, and give output as:
{"name":"bob","age":10}
But as VS code, it gives me the below problems:
What could be the issue?
NOTE
I aware that Struct tag supposed to be a key:"value", field:"name", and tried:
type User struct {
Name string `field:"name"`
Age int64 `field:"age"`
}
But the output this time was wrong, I got:
{"field:"name"":"bob","field:"age"":10}