til/Development/Go/errors.md

# [errors](https://golang.org/pkg/errors/)

Wrap error:

```go
err := fmt.Errorf("Something wrong: %w", rootErr)
```

Unwrap error:

```go
rootErr := errors.Unwrap(err)
```

Compare error:

```go
// Don't
if err == CustomErr

// Do
if errors.Is(err, CustomErr)
```