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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Defining new data types with generics

In this section we are going to create a new data type with the use of generics, which is presented in newDT.go. The code of newDT.go is the following:

package main
import (
type TreeLast[T any] []T

The previous statement declares a new data type named TreeLast that uses generics.

func (t TreeLast[T]) replaceLast(element T) (TreeLast[T], error) {
    if len(t) == 0 {
        return t, errors.New("This is empty!")
    t[len(t) - 1] = element
    return t, nil

replaceLast() is a method that operates on TreeLast variables. Apart from the function signature, there is nothing else that shows the use of generics.

func main() {
    tempStr := TreeLast[string]{"aa", "bb"}

In this first part of main(), we create a TreeLast variable with the aa and bb...