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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Creating example functions

Part of the documentation process is generating example code that showcases the use of some or all the functions and data types of a package. Example functions have many benefits, including the fact that they are executable tests that are executed by go test. Therefore, if an example function contains an // Output: line, the go test tool checks whether the calculated output matches the values found after the // Output: line. Although we should include example functions in Go files that end with _test.go, we do not need to import the testing Go package for example functions. Moreover, the name of each example function must begin with Example. Lastly, example functions take no input parameters and return no results.

We are going to illustrate example functions using the code of exampleFunctions.go and exampleFunctions_test.go. The content of exampleFunctions.go is as follows:

package exampleFunctions
func LengthRange(s string) int {
    i := 0