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

Reading a specific amount of data

In this section, you will learn how to read exactly the amount of data you want. This technique is particularly useful when reading binary files, where you have to decode the data you read in a particular way. Nevertheless, this technique still works with text files.

The logic behind this technique is as follows: you create a byte slice with the size you need and use that byte slice for reading. To make this more interesting, this functionality is going to be implemented as a function with two parameters. One parameter will be used to specify the amount of data that you want to read, and the other parameter, which will have the *os.File type, will be used to access the desired file. The return value of that function will be the data you have read.

The name of the Go program for this topic will be readSize.go and it will be presented in four parts...