Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
5 (1)
Book Image

The Go Workshop

5 (1)
By: Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó

Overview of this book

The Go Workshop will take the pain out of learning the Go programming language (also known as Golang). It is designed to teach you to be productive in building real-world software. Presented in an engaging, hands-on way, this book focuses on the features of Go that are used by professionals in their everyday work. Each concept is broken down, clearly explained, and followed up with activities to test your knowledge and build your practical skills. Your first steps will involve mastering Go syntax, working with variables and operators, and using core and complex types to hold data. Moving ahead, you will build your understanding of programming logic and implement Go algorithms to construct useful functions. As you progress, you'll discover how to handle errors, debug code to troubleshoot your applications, and implement polymorphism using interfaces. The later chapters will then teach you how to manage files, connect to a database, work with HTTP servers and REST APIs, and make use of concurrent programming. Throughout this Workshop, you'll work on a series of mini projects, including a shopping cart, a loan calculator, a working hours tracker, a web page counter, a code checker, and a user authentication system. By the end of this book, you'll have the knowledge and confidence to tackle your own ambitious projects with Go.
Table of Contents (21 chapters)
Free Chapter
1. Variables and Operators
2. Logic and Loops

Making Time

Making time means declaring a variable that holds the time formatted in a specific way. Formatting time will be covered at the end of this chapter; so, for now, we will use the default formatting that is provided by Go. In this topic, we will be executing everything in the main() function of our script, so the skeleton should look like this:

package main
import "fmt"
import "time"
func main(){
  //this is where the code goes.

Let's look at our skeleton first and learn how to create and manipulate time variables. Our skeleton has the standard package main definition that is necessary. We use the fmt package to print the output to the console. Since we'll be using the time module, we'll need to import that as well.

Whenever we issue go run <script>.go, the main() function gets called and executes whatever is declared in it.

One of the most common jobs for the time module is to measure the duration of the execution...