inspector.go

package main

import (
	"fmt"
	"reflect"
)

type User struct {
	ID    int
	Email string `json:"email" yaml:"email_address"`
	Data  struct {
		Key   string
		Value bool
	}
}

func main() {
	u := User{ID: 42}
	addrU := &u
	uType := reflect.TypeOf(u)
	addrType := reflect.TypeOf(addrU)
	fmt.Printf("Type of u: %s | kind: %s\n", uType.Name(), uType.Kind())
	fmt.Printf("Type of addrU: %s | kind: %s\n", addrType.Elem(), addrType.Kind())

	fmt.Println("\n<Inspect struct u>\n")
	for i := 0; i < uType.NumField(); i++ {
		field := uType.Field(i)
		fmt.Printf("Type of field %s: %s | kind: %s\n", field.Name, field.Type.Name(), field.Type.Kind())
		if field.Tag != "" {
			fmt.Printf("\tTags for %s:\n", field.Name)
			fmt.Printf("\t\t->json: %s\n\t\t->yaml: %s\n", field.Tag.Get("json"), field.Tag.Get("yaml"))
		}
		if field.Type.Kind() == reflect.Struct {
			for j := 0; j < field.Type.NumField(); j++ {
				subField := field.Type.Field(j)
				fmt.Printf("\tType of subfield %s: %s | kind: %s\n", subField.Name, subField.Type.Name(), subField.Type.Kind())
			}
		}
	}
}