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

Basic Debugging

We have been happily coding along. The big moment has arrived; it is time to run our program. We run our program and find the results are not as we expected them to be. In fact, something is grossly wrong. Our inputs and outputs are not matching up. So, how do we figure out what went wrong? Well, having bugs appear in our programs is something that we all face as developers. However, there is some basic debugging that we can perform to aid us in remediating or, at the very least, gathering information about these bugs by:

  • Printing out the code markers in the code:

    Markers in our code are print statements that help us to identify where we are in the program when the bug occurred:

    fmt.Println("We are in function calculateGPA")
  • Printing out the type of the variable:

    While debugging, it might be useful to know the variable type that we are evaluating:

    fmt.Printf("fname is of type %T\n", fname)
  • Printing out the value of the variable: