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The Go Workshop

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

4.8 (20)

The Go Workshop

4.8 (20)

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.

Preface

Preface

About the Book

Free Chapter

1. Variables and Operators

1. Variables and Operators

Introduction

Summary

2. Logic and Loops

2. Logic and Loops

Introduction

Summary

3. Core Types

3. Core Types

Introduction

True and False

Numbers

Byte

Text

The nil Value

Summary

4. Complex Types

4. Complex Types

Introduction

Collection Types

Arrays

Slice

Simple Custom Types

Structs

Summary

5. Functions

5. Functions

Introduction

Functions

fizzBuzz

Parameters

Naked Returns

Closures

defer

Summary

6. Errors

6. Errors

Introduction

What Are Errors?

Error Handling Using Other Programming Languages

Error Interface Type

Panic

Recover

Summary

7. Interfaces

7. Interfaces

Introduction

Interface

Duck Typing

Polymorphism

Accepting Interfaces and Returning Structs

Summary

8. Packages

8. Packages

Introduction

What Is a Package?

Exported and Unexported Code

The init() Function

Summary

9. Basic Debugging

9. Basic Debugging

Introduction

Methods for Bug-Free Code

Basic Debugging

Logging

Log Fatal Errors

Summary

10. About Time

10. About Time

Introduction

Making Time

Comparing Time

Duration Calculation

Managing Time

Formatting Time

Summary

11. Encoding and Decoding (JSON)

11. Encoding and Decoding (JSON)

Introduction

JSON

Decoding JSON

Encoding JSON

GOB: Go's Own Encoding

Summary

12. Files and Systems

12. Files and Systems

Introduction

Filesystem

Flags and Arguments

Creating and Writing to Files

CSV

Summary

13. SQL and Databases

13. SQL and Databases

Introduction

The Database

Database API and Drivers

Connecting to Databases

Creating Tables

Inserting Data

Retrieving Data

Updating Existing Data

Deleting Data

Truncating and Deleting Table

Summary

14. Using the Go HTTP Client

14. Using the Go HTTP Client

Introduction

The Go HTTP Client and Its Uses

Sending a Request to a Server

Structured Data

Sending Data to a Server

Summary

15. HTTP Servers

15. HTTP Servers

Introduction

How to Build a Basic Server

HTTP Handler

Simple Routing

Handler versus Handler Function

Returning Complex Structures

Dynamic Content

Templating

Static Resources

Getting Some Style

Getting Dynamic

HTTP Methods

JSON loads

Summary

16. Concurrent Work

16. Concurrent Work

Introduction

Goroutines

WaitGroup

Race Conditions

Atomic Operations

Invisible Concurrency

Channels

The Importance of Concurrency

Concurrency Patterns

Buffers

HTTP Servers

Methods as Routines

Go Context Package

Summary

17. Using Go Tools

17. Using Go Tools

Introduction

The go build Tool

The go run Tool

The gofmt Tool

The goimports Tool

The go vet Tool

The Go Race Detector

The go doc Tool

The go get Tool

Summary

18. Security

18. Security

Introduction

Application Security

Cross-Site Scripting

Cryptography

Encryption

Random Generators

HTTPS/TLS

Password Management

Summary

19. Special Features

19. Special Features

Introduction

Build Constraints

Reflection

TypeOf and ValueOf

DeepEqual

Wildcard Pattern

The unsafe Package

Summary

Appendix

Appendix

1. Variables and Operators

2. Logic and Loops

3. Core Types

4. Complex Types

5. Functions

6. Errors

7. Interfaces

8. Packages

9. Basic Debugging

10. About Time

11. Encoding and Decoding (JSON)

12. Files and Systems

13. SQL and Databases

14. Using the Go HTTP Client

15. HTTP Servers

16. Concurrent Work

17. Using Go Tools

18. Security

19. Special Features

What Next?

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defer

The defer statement defers the execution of a function until the surrounding function returns. Let's try to explain this a bit better. Inside a function, you have a defer in front of a function that you are calling. That function will execute essentially right before the function you are currently inside completes. Still confused? Perhaps an example will make this concept a little clearer:

package main
import "fmt"
func main() {
  defer done()
  fmt.Println("Main:  Start")
  fmt.Println("Main:  End")
}
func done() {
  fmt.Println("Now I am done")
}

The output for the defer example is as follows:

Main: Start
Main: End
Now I am done

Inside the main() function, we have a deferred function, defer done(). Notice that the done() function has no new or special syntax. It just has a simple print to stdout.

Next, we have two print statements. The results are interesting. The two print statements...

Visually different images

CONTINUE READING

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