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main.go
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main.go
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package main
import (
"encoding/json"
"fmt"
"log"
)
// User holds user data.
type User struct {
Name string `json:"name"`
Email string
Age int
Optionals map[string]any `json:"-"`
}
func main() {
incoming := `{
"name": "Uğur",
"email": "vigo@example.com",
"age": 51,
"foo": 1,
"bar": "2"
}`
u := User{}
if err := json.Unmarshal([]byte(incoming), &u.Optionals); err != nil {
log.Fatal(err)
}
fmt.Println("u.Optionals", u.Optionals)
// u.Optionals map[age:51 bar:2 email:vigo@example.com foo:1 name:Uğur]
if v, ok := u.Optionals["name"].(string); ok {
u.Name = string(v)
delete(u.Optionals, "name")
}
if v, ok := u.Optionals["email"].(string); ok {
u.Email = string(v)
delete(u.Optionals, "email")
}
if v, ok := u.Optionals["age"].(float64); ok {
u.Age = int(v)
delete(u.Optionals, "age")
}
fmt.Printf("u: %+v\n", u)
// u: {Name:Uğur Email:vigo@example.com Age:51 Optionals:map[bar:2 foo:1]}
if u.Email != "" {
fmt.Println("u.Email", u.Email)
// u.Email vigo@example.com
}
if u.Age != 0 {
fmt.Println("u.Age", u.Age)
// u.Age 51
}
if len(u.Optionals) > 0 {
fmt.Printf("you have %d invalid field(s)\n", len(u.Optionals))
// you have 2 invalid field(s)
for v := range u.Optionals {
fmt.Printf("%q\n", v)
}
// "foo"
// "bar"
}
}