2948 explained code solutions for 75 technologies


golangHow to use errors


package main
import "errors"

func test(param string) (string, error) {
  if param == "" {
    return "", errors.New("this is bad")
  }
  
  return "<" + param + ">", nil
}

func main() {
  res, err := test("")
}ctrl + c
package main

default package declaration

import "errors"

load lib to work with errors

errors.New(

creates new error object

(string, error)

our function will return string result and error


Usage example

package main
import ( "fmt"; "errors" )

func test(param string) (string, error) {
  if param == "" {
    return "", errors.New("this is bad")
  }

  return "<" + param + ">", nil
}

func main() {
  res, err := test("")
  fmt.Println(err)

  res, err = test("tag")
  fmt.Println(res)
}
output
this is bad
<tag>