golang methods - pointers vs value

assertion-and-interface.go

package main

import (
	"fmt"
)

type CodeError struct {
	text string
	code string
}

type ICodeError interface {
	GetCode() string
}

func (c CodeError) GetCode() string {
	return c.code
}

func (c CodeError) Error() string {
	return c.text
}

func NewCodeError(text string, code string) error {
	return CodeError{text, code}
}

// assertion-and-interface
// https://play.golang.org/p/wpE5oYBK_SG
func main() {
	err := NewCodeError("asdasdfasdf", "11")
	
	err1, ok := err.(ICodeError)
	fmt.Printf("err1: %v\n", err1)
	fmt.Printf("ok: %v\n", ok)

	code := err1.GetCode()
	fmt.Printf("code: %v\n", code)
}


// err1: asdasdfasdf
// ok: true
// code: 11