errorsx

Extensions for the standard errors package.

📦 Install

Go 1.21+

go get go-simpler.org/errorsx

📋 Usage

IsAny

A multi-target version of errors.Is.

// Before:
if errors.Is(err, os.ErrNotExist) || errors.Is(err, os.ErrPermission) {
    fmt.Println(err)
}

// After:
if errorsx.IsAny(err, os.ErrNotExist, os.ErrPermission) {
    fmt.Println(err)
}

As

A generic version of errors.As.

// Before:
var pathErr *os.PathError
if errors.As(err, &pathErr) {
    fmt.Println(pathErr.Path)
}

// After:
if pathErr, ok := errorsx.As[*os.PathError](err); ok {
    fmt.Println(pathErr.Path)
}

Do

Calls the given function and joins the returned error (if any) with err.

f, err := os.Open("file.txt")
if err != nil {
    return err
}

// Before:
defer func() {
    err = errors.Join(err, f.Close())
}()

// After:
defer errorsx.Do(f.Close, &err)