Print struct field names and values using Reflection

printStructFieldNameAndValue.md

At some point in your day to day hacking life, getting the Struct fields and values may come in handy.

package main

import (
	"fmt"
	"reflect"
)

type Person struct {
	Name string
	ID   string
}

type Robot struct {
	Person
	IP string
}

func main() {
	p := Person{"john", "12345"}
	r := Robot{p, "1.1.1.1"}

	v := reflect.ValueOf(&r).Elem()

	for i := 0; i < v.NumField(); i++ {
		if v.Field(i).Kind() == reflect.Struct {
			v2 := reflect.ValueOf(v.Field(i).Interface())
			for j := 0; j < v2.NumField(); j++ {
				fmt.Printf("%s.%s %s = %v\n",
					v.Field(i).Type(),
					v2.Type().Field(j).Name,
					v2.Field(j).Type(),
					v2.Field(j).Interface(),
				)
			}
			continue
		}

		fmt.Printf("%s %s = %v\n",
			v.Type().Field(i).Name,
			v.Field(i).Type(),
			v.Field(i).Interface(),
		)
	}
}

Output:

main.Person.Name string = john
main.Person.ID string = 12345
IP string = 1.1.1.1