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Package errors
Package errors implements functions to manipulate errors.
▾ Example
Code:
package errors_test
import (
"fmt"
"time"
)
type MyError struct {
When time.Time
What string
}
func (e MyError) Error() string {
return fmt.Sprintf("%v: %v", e.When, e.What)
}
func oops() error {
return MyError{
time.Date(1989, 3, 15, 22, 30, 0, 0, time.UTC),
"the file system has gone away",
}
}
func Example() {
if err := oops(); err != nil {
fmt.Println(err)
}
}
func New(text string) error
New returns an error that formats as the given text.
▾ Example
Code:
err := errors.New("emit macho dwarf: elf header corrupted")
if err != nil {
fmt.Print(err)
}
Output:
emit macho dwarf: elf header corrupted
▾ Example (Errorf)
The fmt package's Errorf function lets us use the package's formatting
features to create descriptive error messages.
Code:
const name, id = "bimmler", 17
err := fmt.Errorf("user %q (id %d) not found", name, id)
if err != nil {
fmt.Print(err)
}
Output:
user "bimmler" (id 17) not found