"Returning Defined Errors" section outdated

[zolia]

Error defining/handling examples mostly outdated since go 1.13 as there was %w directive introduced for fmt.Errorf() function.

Something like this can be used if you want to introduce details into the error itself. No need to define yet another struct+interface for that:

import (
	"errors"
	"fmt"
)

var ErrSomeStaticError = errors.New("static error")

func main() {
	err := ReturnErrorWithDetails()
	if errors.Is(err, ErrSomeStaticError){
		fmt.Printf("found static error with details: %v\n", err)
		fmt.Printf("just static error: %v\n", errors.Unwrap(err))
	} else {
		fmt.Print("static error not found")
	}
}

func ReturnErrorWithDetails() error {
	return fmt.Errorf("some details here, item count: %d, vector name: %s: %w", 10, "infinity", ErrSomeStaticError)
}

[Pungyeon]

Hi @zolia, I agree that the article should be changed to including the above instead 🙇