Error Handling

Summary

`try`/`catch`/`finally` and custom `Error` subclasses let you gracefully handle failures instead of letting them crash your app silently. Robust error handling should distinguish expected failures from programming bugs, preserve useful context, provide user-safe messages, and make failures observable during development.

• 1Wrap a risky operation (JSON parsing, a fetch call) in `try`/`catch`. Validate your understanding by applying it in a small practical example.
• 2Create a custom error class extending `Error` with extra context. Validate your understanding by applying it in a small practical example.
• 3Learn how errors propagate through `async` functions and Promise chains.