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Powerful Command-Line Applications in Go

Handling Errors

Explore methods for handling errors in Go command-line applications, including defining error values, wrapping errors for context, and creating custom error types to manage complex scenarios. Learn how these techniques improve error resilience and aid testing for more robust applications.

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At this point, our application handles errors by defining error strings, using the function fmt.Errorf() from package fmt. This is a valid approach for small applications, but it’s harder to maintain as our application grows in complexity. For instance, relying only on comparing the error message isn’t a resilient method because the error message may change.

Creating the errors.go file

Earlier, we handled errors by defining error values as exported variables. We can use this approach here to handle simple errors, such as validating input parameters. Add a file errors.go to our project and edit it. Add the package definition and the import section.

For this file, we’re using:

  • The package errors to define error values.
  • The
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