Guide to go-opera: Better error handling in Go, but less boilerplate

The provided code snippets illustrate the transition from a traditional error handling approach in Go to using the opera library for managing errors and making the business logic clearer. Here's an analysis of both examples:

Example 1: Registering a User

Before (Traditional Error Handling):

go
 
1func register(email string) (User, error) {
2    validatedEmail, err := validateEmail(email)
3    if err != nil {
4        return User{}, fmt.Errorf("validate email: %w", err)
5    }
6    
7    existingUser, err := findUserByEmail(validatedEmail)
8    if err != nil {
9        if !errors.Is(err, ErrUserNotFound) {
10            return User{}, fmt.Errorf("check existing email: %w", err)
11        }
12    } else {
13        if existingUser.ID != "" {
14            return User{}, fmt.Errorf("email already registered: %w", ErrEmailTaken)
15        }
16    }
17
18    createdUser, err := createUser(validatedEmail)
19    if err != nil {
20        return User{}, fmt.Errorf("create user: %w", err)
21    }
22
23    if err := sendWelcomeEmail(createdUser); err != nil {
24        return User{}, fmt.Errorf("send welcome email: %
25
26[Read the full article at DEV Community](https://dev.to/colafanta/guide-to-go-opera-better-error-handling-in-go-but-less-boilerplate-2hf4)
27
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