Book Image

Mastering Go – Third Edition - Third Edition

By : Mihalis Tsoukalos
5 (2)
Book Image

Mastering Go – Third Edition - Third Edition

5 (2)
By: Mihalis Tsoukalos

Overview of this book

Mastering Go is the essential guide to putting Go to work on real production systems. This freshly updated third edition includes topics like creating RESTful servers and clients, understanding Go generics, and developing gRPC servers and clients. Mastering Go was written for programmers who want to explore the capabilities of Go in practice. As you work your way through the chapters, you’ll gain confidence and a deep understanding of advanced Go concepts, including concurrency and the operation of the Go Garbage Collector, using Go with Docker, writing powerful command-line utilities, working with JavaScript Object Notation (JSON) data, and interacting with databases. You’ll also improve your understanding of Go internals to optimize Go code and use data types and data structures in new and unexpected ways. This essential Go programming book will also take you through the nuances and idioms of Go with exercises and resources to fully embed your newly acquired knowledge. With the help of Mastering Go, you’ll become an expert Go programmer by building Go systems and implementing advanced Go techniques in your projects.
Table of Contents (17 chapters)
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Working with two different CSV file formats

In this section we are going to implement a separate command-line utility that works with two different CSV formats. The reason we are doing this is that there are times when you will need your utilities to be able to work with multiple data formats.

Remember that the records of each CSV format are stored using their own Go structure under a different variable name. As a result, we need to implement sort.Interface for both CSV formats and therefore for both slice variables.

The two supported formats are the following:

  • Format 1: name, surname, telephone number, time of last access
  • Format 2: name, surname, area code, telephone number, time of last access

As the two CSV formats that are going to be used have a different number of fields, the utility determines the format that is being used by the number of fields found in the first record that was read and acts accordingly. After that, the data will be sorted...