GoLang: The Ultimate Guide

get link Cover Page Half-Title Page Title Page Copyright Page Contents Acknowledgments About the Author Chapter 1 ◾ Crash Course in GoLang IS IT REFERRED TO AS Go OR GoLang? WHAT IS THE PURPOSE OF GoLang? WHY IS Go SO POPULAR? Other Programming Languages vs. Go Python vs. Go But How Does Go Stack Up against Python? SHOULD WE STUDY Go? Go PROGRAMMING FEATURES WHAT MAKES GoLang SUPERIOR TO OTHER COMPUTER LANGUAGES? GoLang’s Core Capability Multithreading and Concurrency From within, Go Empowers Hardware Unmatched Simplicity of Go Built-in Testing and Profiling Framework Easy Learning Curve BEGINNING WITH Go Text Editor Finding a Go Compiler INSTALL Go ON WINDOWS How Can We Know Which Go Language Version Is Preinstalled? Downloading and Installing Go WRITING THE FIRST Go PROGRAM Why Is There a “Go Language”? What Is Missing in Go That the Other Languages Have? Hardware Restrictions The Upsides and Downsides of the Go Language TERMINAL The Open Terminal Tool Window Start the New Session INSTALL Go ON Mac Making Our First Program Implement a Go Program Do Go Programs Interact with Programs Written in C/C++? HOW CAN WE CREATE AN EMPTY FILE IN GoLang? HOW TO MAKE A DIRECTORY IN Go HOW TO READ AND WRITE A Go PROGRAM HOW DO WE RENAME AND TRANSFER A FILE IN GoLang? HOW TO READ A FILE LINE BY LINE AND CONVERT IT TO A STRING BASIC SYNTAX Tokens Line Separator Comments Identifiers Keywords Whitespace DATA TYPES IN Go Numbers Booleans Strings VARIABLES IN Go Declaring a Variable Employing the var Keyword Using the Short Variable Declaration CONSTANTS How Should We Declare? Untyped and Typed Numeric Constants Numeric Constant String Literals Boolean Constant VARIABLE SCOPE IN Go Local Variables Global Variables DECLARATION OF MULTIPLE VARIABLES SHORTHAND DECLARATION OPERATORS IN Go Arithmetic Operators Relational Operators Logical Operators Bitwise Operators Assignment Operators Misc Operators CONTROL STATEMENTS if Statement if…else Statement Nested if Statement if..else..if Ladder SWITCH STATEMENT Expression Switch Type Switch ARRAYS Creating and Using an Array Using var Keyword Using a Shorthand Declaration Multidimensional Array How Do You Copy an Array into Another Array? How Can We Pass an Array to a Function? SLICES Slice Declaration Slice Components How Do We Create and Begin a Slice? Using Slice Literal Using an Array Using an Existing Slice Using the make() Function How to Iterate over a Slice Using the for Loop Using Range in a for Loop Using a Blank Identifier in a for Loop Slice Composite Literal How to Sort a Slice of ints Ints IntsAreSorted How Do We Trim a Slice of Bytes in GoLang? How Do We Split a Slice of Bytes? STRING String Literals Using Double Quotes (“”) Using Backticks(“) How Do We Trim a String? Trim TrimLeft TrimRight TrimSpace TrimSuffix TrimPrefix How to Split a String Split SplitAfter SplitAfterN MAPS How Do We Create and Initialize Maps? Simple Using the make() Function WHAT IS A BLANK IDENTIFIER (underscore)? DEFER KEYWORD PANIC IN GoLang RECOVER CLOSURES RECURSION POINTERS What Are Points Used For? Pointers Declaration and Initialization Declaring a Pointer Pointer Initialization Dereferencing a Pointer In GoLang, How Can We Instantiate a Struct Using the New Keyword? Pointers to a Function Create a Pointer and Pass It to the Function Passing an Address of the Variable to Function Call Pointer to a Struct Pointer to Pointer in Go How to Declare a Pointer to a Pointer Comparing Pointers == operator != operator GoLang STRUCTURES Pointers to a Struct GoLang’s NESTED STRUCTURE GoLang METHODS Method with the Struct Type Receiver Method with the Non-Struct Type Receiver Methods with the Pointer Receiver INTERFACES How Do We Make an Interface? How to Implement Interfaces Why Are Go Interfaces Wonderful? Redundant Functions INHERITANCE POLYMORPHISM USING INTERFACES Chapter 2 ◾ Test-Driven Development DEVELOPING A NEW PROJECT MAKING Go FILES RUN TESTS A TEST THAT FAILED THE FUNCTION BEING TESTED WRITING A TEST-FIRST FUNCTION REFACTORING Go WITH Go/ANALYSIS Invoke the Refactoring Command Conflicts Resolve Configure the Refactoring Options My Top Four Go Refactoring Approaches Method of Extraction Method of Move Create a Parameter Object Replace Symbolic Constant with Magic Number REFACTORING OUR FIRST Go CODE Include a Parameter Check Add String Formatting Take Out the Code Write a Test GoLang ERROR HANDLING Errors in GoLang Creating Our Own Mistakes Errors Caused by Strings Data Custom Mistakes Handling Errors in Functions Defer Panic Recover Error Wrapping Casting Errors WRITE UNIT TESTING IN Go Beginning Unique to Go Setup and Teardown Testing within the Same Package Five Basic Techniques and Strategies for Developing GoLang Unit Tests Chapter 3 ◾ Packaging in GoLang PACKAGES IN GoLang Workspace Main Package Import Packages Install Third-Party Packages Init Function Important Considerations Giving the Packages Names Code Exported Essential Go Packages and Libraries Awesome Go GoLang-Set Color Now Gen Gorm Goose Glide Ginkgo Etcd NSQ Docker Kubernetes DEPENDENCY MANAGEMENT Versioning Modules Installing Dependencies Dependencies Must Authenticate Remove Unused Dependencies Installing Dependencies That Are Missing Updating the Versions of Dependencies Listing Dependencies Module vs. Package Naming Fetching Packages Chapter 4 ◾ Handling Concurrency CONCURRENCY Illustration of the Sleeping Barber Issue Example of a Producer-Consumer Problem Goroutines – CONCURRENCY IN GoLang Go Concurrent Programming Issues with Multithreading How to Create a Goroutine MULTIPLE Goroutines What Is the Difference between Parallelism and Concurrency? Goroutines Provide Several Advantages over Threads COMMUNICATE TO SHARE MEMORY HOW TO USE Goroutines TO ACCESS SHARED RESOURCES Access Shared Resources Using Goroutines Using Mutual Exclusion to Get Access to Shared Resources Using Atomic Counters to Get Access to Shared Resources Concurrency Issues Concurrency Disadvantages Benefits of Concurrency Problems with Concurrency Chapter 5 ◾ GoLang for JavaScript Developers FLOW CONTROL Loop Control Statements in Go Break Statement Goto Statement Continue Statement TYPES Basic Types Numbers Booleans Strings Type Conversion Type Assertion Structs Initializing Composition vs. Inheritance HOW DO YOU MAKE MODULES IN GoLang? Adding Dependencies to the Go Module PACKAGE MANAGEMENT USING Go MODULES What Exactly Is the Go Module? Starting Out Module Initializing Setting Up Dependencies Eliminating Unnecessary Dependencies Updating a Dependency Version ERROR HANDLING Error Type Representation Various Approaches to Getting More Information from an Error Don’t Ignore Errors IN GoLang, THERE ARE SEVERAL TECHNIQUES TO COMPARE STRINGS Making Use of Comparison Operators Using the Compare() Method FUNCTIONS IN Go Function Declaration Function Calling Function Arguments FUNCTION RETURNING MULTIPLE VALUES Giving Names to the Return Values VARIADIC FUNCTIONS ANONYMOUS FUNCTION GoLang main AND init FUNCTIONS main() Function init() Function Chapter 6 ◾ Code Optimization A PATTERN FOR OPTIMIZING Go Why Is Code Optimization Necessary? Code Base That Is Cleaner Improved Consistency Pages That Load Faster Improved Code Readability More Efficient Refactoring Easier to Understand Debugging Enhanced Workflow Code Upkeep Is Now Easier Improved Feature Development The Ultimate Guide to GoLang Performance Optimization GoLang Performance Hints That Have Been Proven and Tested Optimization of Resource Efficiency Optimization of Latency in GoLang Efficiency of Algorithms Patterns of GoLang Application Performance Use Goroutines Sparingly CPU Work Should Parallelize Asynchronous I/O Operations Keep an Eye on Our Timeouts Memory Should Not Allocate in Hot Spots Make Use of Lock-Free Algorithms Prefer Read-Only Locks Reduce or Eliminate the Use of ‘cgo’ Make Use of Buffered I/O Use Binary Instead StringBuffer and StringBuilder Are Preferable Make Use of Regular Expressions Slices Should Preallocate Select Protocol Buffers and MessagePack as Our Options For Maps, Use int Rather Than a String GoLang FOR SECURE CODING Stuck in a Rut with Manual Security With Go, There Is a Need for Integrated, Automated Security How Does Instrument-Based Security Work in the Go Pipeline? Contrast Goes Above and Beyond with Modern Application Security Go Security Best Practices Verify the Input Entries Make Use of HTML Templates Protect Ourselves against SQL Injections Encrypt Any Sensitive Data Make HTTPS Communication Mandatory Be Cautious of Mistakes and Logs BEST PRACTICES FOR GoLang Syntax Assign Datatypes to Newly Created Variables Do Not Declare a Variable or Import a Package That We Do Not Require Follow Proper Naming Conventions Make Use of Comments to Help in Knowledge Transfer Simple, Readable, and Maintainable Code Avoid Nesting by Dealing with Mistakes First Avoid Utility Repeats To Address Exceptional Circumstances, Use the Type Switch Go Code Organization For Use in CI/CD Workflows Make Use of Go Modules Ensure Immutability and Availability Using GOPROXY Chapter 7 ◾ GoLang Tutorials and Projects WEB APPLICATION TO GENERATE QR CODE IN GoLang Install the Necessary Package Development Main.go Source Code Generator.html Source Code Implementation SETTING UP THE Go HTTP CLIENT HTTP Client in GoLang POST and GET Requests Adding Request Headers Our Requests Are Being Authorized WHAT IS THE GoLang REST API? Using GoLang to Consume a REST API Project Setup Imports Example of a Response Struct Code Run the Project APPRAISAL CHEAT SHEET BIBLIOGRAPHY INDEX