===== Error Handling =====

==== What is it? ====
In Go, **errors** are values returned from functions.
The common pattern is: return `(result, error)` and check `if err != nil`.

==== What is it used for? ====
  * Report failures without exceptions.
  * Keep control flow explicit.
  * Add context to failures (wrapping) and handle them appropriately.

==== Core topics ====
  * [[go:errors:error_interface|error interface]]
  * [[go:errors:custom_errors|Custom errors]]
  * [[go:errors:sentinel_errors|Sentinel errors]]
  * [[go:errors:error_wrapping|Error wrapping (%w)]]
  * [[go:errors:errors_is_as|errors.Is / errors.As]]
  * [[go:errors:panic_vs_error|panic vs error]]
  * [[go:errors:defer_cleanup|defer for cleanup]]

==== Hard words (English) ====
  * **explicit** /ɪkˈsplɪsɪt/: tường minh
  * **failure** /ˈfeɪljər/: lỗi/thất bại
  * **context** /ˈkɑːntekst/: ngữ cảnh