wiki/content/20200909202454-errors.md

id	title
5114b51a-da22-4c9c-a12c-c416aeb984b6	Golang Errors

Basics

Go supports Errors

import (
    "errors"
    "fmt"
)

func ThrowError(throwError bool) error {
    if throwError {
        return errors.New("This is an error")
    }

    fmt.Println("No error was thrown!")
    return nil
}

func main() {
    ThrowError(true)
    ThrowError(false)
}

Wrappers

It appears to be good practice to make errors a const. This example uses the Error interface:

const (
    ErrNotFound   = DictionaryErr("could not find the word you were looking for")
    ErrWordExists = DictionaryErr("cannot add word because it already exists")
)

type DictionaryErr string

func (e DictionaryErr) Error() string {
    return string(e)
}

Handy Links

• Constant errors¹

Footnotes

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1. https://dave.cheney.net/2016/04/07/constant-errors ↩︎