Book Image

Mastering Go - Second Edition

By : Mihalis Tsoukalos
Book Image

Mastering Go - Second Edition

By: Mihalis Tsoukalos

Overview of this book

Often referred to (incorrectly) as Golang, Go is the high-performance systems language of the future. Mastering Go, Second Edition helps you become a productive expert Go programmer, building and improving on the groundbreaking first edition. Mastering Go, Second Edition shows how to put Go to work on real production systems. For programmers who already know the Go language basics, this book provides examples, patterns, and clear explanations to help you deeply understand Go’s capabilities and apply them in your programming work. The book covers the nuances of Go, with in-depth guides on types and structures, packages, concurrency, network programming, compiler design, optimization, and more. Each chapter ends with exercises and resources to fully embed your new knowledge. This second edition includes a completely new chapter on machine learning in Go, guiding you from the foundation statistics techniques through simple regression and clustering to classification, neural networks, and anomaly detection. Other chapters are expanded to cover using Go with Docker and Kubernetes, Git, WebAssembly, JSON, and more. If you take the Go programming language seriously, the second edition of this book is an essential guide on expert techniques.
Table of Contents (20 chapters)
Title Page

Loading and saving data on disk

Do you remember the keyValue.go application from Chapter 4, The Uses of Composite Types? Well, it was far from perfect, so in this section you will learn how to save the data of a key-value store on disk and how to load it back into memory when you next start your application.

We are going to create two new functions, one named save() for saving data to disk and another named load() for retrieving the data from disk. Thus, we will only present the code differences between keyValue.go and kvSaveLoad.go using the diff(1) UNIX command-line utility.

The diff(1) UNIX command-line utility can be very convenient when you want to spot the differences between two text files. You can learn more about it by executing man 1 diff at the command line of your favorite UNIX shell.

If you think about the task to be implemented here, you will recognize that what you...