Скачать или смотреть Functional Error Handling in Node js With The Result Pattern

1. What’s the traditional error-handling method in Node.js?
Using try-catch blocks and exceptions, though this can cause unpredictable control flow and hidden bugs.

2. What is the “fail-fast principle”?
It means stopping execution immediately when an error occurs, letting the caller handle the exception.

3. Why are exceptions problematic?
Methods don’t show which exceptions they might throw, making it harder for clients to handle errors correctly.

4. When should exceptions be used?
Only for truly unexpected or unhandled errors — and they should be caught as close to the source as possible.

5. What’s the main idea behind the Result Pattern?
Treat errors as values instead of interruptions, allowing smoother and more predictable error handling.

6. What is a Result object?
It’s a container holding either a Success (with data) or an Error (with failure details).

7. Why is the Result type better for communication?
It makes the function’s return type explicit, clearly showing that the function can fail.

8. How does it improve control flow?
By removing exceptions, it creates predictable logic and clear error outcomes.

9. Does it help with testing?
Yes — mocking a Result object is simpler than setting up exception-based tests.

10. What’s the main drawback?
It can be more verbose, requiring slightly more code than traditional exception handling.

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