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

What Are Errors?

An error is something that causes your program to produce unintended results. Those unintended results could range from the application crashing, incorrect data calculation (such as a bank transaction not being processed correctly), or not providing any results. These unintended results are referred to as software bugs. Any software would contain errors during its lifetime due to numerous scenarios that programmers do not anticipate. The following are possible outcomes when errors occur:

  • The erroneous code could cause the program to crash without warning.
  • The output of the program was not the intended result.
  • An error message is displayed.

There are three types of errors that you might encounter:

  • Syntax errors
  • Runtime errors
  • Semantic errors

Syntax Errors

Syntax errors result from improper use of the programming language. This often occurs due to mistyping the code. Most modern IDEs will have some visual way of bringing...