[Talking-Golang (Go)] Errors

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errors

error is a interface, here is its definition:

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type error interface {
    Error() string
}

Error without stack

The traditional error handling idiom in Go is roughly akin to

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import "errors"

func hasError() {}
  if err != nil {
          return err
  }
}

Func New, wrap, Unwrap, Is, As provided by errors package.

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// main.go

package main

import (
	"fmt"
	"errors"
)

func main() {
	// without stack
	err := errors.New("error msg")
	fmt.Printf("%+v\n", err)    // error msg
	
    // format error message without stack
	err = errors.New(fmt.Sprintf("error %s", "msg"))
	fmt.Printf("%+v\n", err)    // error msg
    
	// format error message without stack
	err = fmt.Errorf("error %s", "msg")
	fmt.Printf("%+v\n", err)    // error msg
}

References

[1] errors - The Go Programming Language - https://golang.org/pkg/errors/

[2] errors | Effective Go - The Go Programming Language - https://golang.org/doc/effective_go#errors

[3] Working with Errors in Go 1.13 - The Go Blog - https://blog.golang.org/go1.13-errors

[4] Go by Example: Errors - https://gobyexample.com/errors