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$ curl repovive.com/roadmaps/go/error-handling/sentinel-errors

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$ curl repovive.com/roadmaps/go/error-handling/sentinel-errors

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Sentinel Errors - Error Handling | Go | Repovive

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Sentinel Errors

Predefined error values

Sentinel errors are predefined error values:

var ErrNotFound = errors.New("not found")
var ErrPermission = errors.New("permission denied")

Export them (uppercase) so callers can check for specific errors. The standard library uses this pattern. io.EOF is a sentinel error indicating end of file.