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  • Book Overview & Buying Go Recipes for Developers
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Go Recipes for Developers

Go Recipes for Developers

By : Burak Serdar
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Go Recipes for Developers

Go Recipes for Developers

By: Burak Serdar

Overview of this book

With its simple syntax and sensible conventions, Go has emerged as the language of choice for developers in network programming, web services, data processing, and other settings. This practical guide helps engineers leverage Go through up-to-date recipes that solve common problems in day-to-day programming. Drawing from three decades of distributed systems engineering and technical leadership at companies like Red Hat, Burak Serdar brings battle-tested expertise in building robust, scalable applications. He starts by covering basics of code structure, describing different approaches to organizing packages for different types of projects. You’ll discover practical solutions to engineering challenges in network programming, dealing with processes, databases, data processing pipelines, and testing. Each chapter provides working solutions and production-ready code snippets that you can seamlessly incorporate into your programs while working in sequential and concurrent settings. The solutions leverage the more recent additions to the Go language, such as generics and structured logging. Most of the examples are developed using the Go standard library without any third-party packages. By the end of this book, you’ll have worked through a collection of proven recipes that will equip you accelerate your Go development journey.
Table of Contents (20 chapters)
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Extracting a specific error from the error tree

How to do it...

Use the errors.As function to descend an error tree, find a particular error, and extract it.

How it works...

Similar to the errors.Is function, errors.As(err error, target any) bool descends the error tree of err until an error that is assignable to target is found. That is done by the following:

  1. It checks if the value pointed to by target is assignable to the value pointed to by err.
  2. If that fails, it checks if err has an As(error) bool method by calling err.As(target). If it returns true, then an error is found.
  3. If not, it checks if err has an Unwrap() error method and err.Unwrap() is not nil, descending the tree.
  4. Otherwise, it checks if err has an Unwrap() []error method, and if it returns a non-empty slice, it descends the tree for each of those until a match is found.

In other words, errors.As copies the error that can be assigned to target into target.

The following example...

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Go Recipes for Developers
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