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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Both arrays and slices limit you to using positive integers as indexes. Maps are powerful data structures because they allow you to use indexes of various data types as keys to look up your data as long as these keys are comparable. A practical rule of thumb is that you should use a map when you are going to need indexes that are not positive integer numbers or when the integer indexes have big gaps.

Although bool variables are comparable, it makes no sense to use a bool variable as the key to a Go map because it only allows for two distinct values. Additionally, although floating point values are comparable, precision issues caused by the internal representation of such values might create bugs and crashes, so you might want to avoid using floating point values as keys to Go maps.

You might ask, why do we need maps and what are their advantages? The following list will help clarify things:

  • Maps are very versatile. Later in this chapter we will...