Setting Struct Field Dinamicaly Using Go

setting_struct_field_dinamicaly.go

package main

import (
	"fmt"
	"reflect"
)

type Config struct {
	A string `default:"joao"`
	B string `default:"maria"`
}

func NewConfig() Config {
	config := Config{"JDSLKJFLKSJDKLFKLDS;lfj;als", ""}

	configT := reflect.TypeOf(config)
	configV := reflect.ValueOf(&config)

	for f := 0; f < configT.NumField(); f++ {
		fieldInfo := configT.Field(f)

		field := configV.Elem().Field(f)

		if field.Interface().(string) == "" {
			defaultValue := fieldInfo.Tag.Get("default")
			field.SetString(defaultValue)
		}
	}

	return config
}

func main() {
	j := NewConfig()
	fmt.Printf("%+v", j)
}