Book Image

The Go Workshop

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

The Go Workshop

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

True and False

True and false logic is represented using the Boolean type, bool. Use this type when you need an on/off switch in your code. The value of a bool can only ever be true or false. The zero value of a bool is false.

When using a comparison operator such as == or >, the result of that comparison is a bool value.

In this code example, we use comparison operators on two numbers. You'll see that the result is a bool:

package main
import "fmt"
func main() {
  fmt.Println(10 > 5)
  fmt.Println(10 == 5)

Running the preceding code shows the following output:


Exercise 3.01: Program to Measure Password Complexity

An online portal creates user accounts for its users and accepts passwords that are only 8-15 characters long. In this exercise, we write a program for the portal to display whether the password entered meets the character requirements. The character requirements are as follows:

  • Have a lowercase...