reflect unexported field

data.go

package data

type s struct {
	a, b string
}

func NewS(a, b string) s {
	return s{a, b}
}

main.go

package main

import (
	"fmt"
	"reflect"
	"reflecttest/data"
)

func main() {
	s := data.NewS("aaa", "bbb")
	v := reflect.ValueOf(s)
	fmt.Println(v.FieldByName("a"))
	fmt.Println(v.FieldByName("b"))

	t := reflect.TypeOf(s)
	f, ok := t.FieldByName("a")
	fmt.Println(f, ok)
}