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)
14
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15
Index

The select keyword

The select keyword is really important because it allows you to listen to multiple channels at the same time. A select block can have multiple cases and an optional default case, which mimics the switch statement. It is good for select blocks to have a timeout option just in case. Last, a select without any cases (select{}) waits forever.

In practice, this means that select allows a goroutine to wait on multiple communication operations. So, select gives you the power to listen to multiple channels using a single select block. As a consequence, you can have nonblocking operations on channels, provided that you have implemented your select blocks appropriately.

A select statement is not evaluated sequentially, as all of its channels are examined simultaneously. If none of the channels in a select statement are ready, the select statement blocks (waits) until one of the channels is ready. If multiple channels of a select statement are ready, then the...