Learning Go Programming Training Course

1. Introduction to Go

• Introduction to Go (Golang)
• Origins and design principles of Go
• Application of Go in web and systems programming
• Primary features:
  • Static typing
  • Emphasis on simplicity and readability
  • Rapid compilation
  • Native support for concurrency
  • Automatic memory management via garbage collection
  • Ability to compile for multiple platforms
• Typical use cases for Go
• Strengths and constraints of the language
• Comparison with C/C++, JavaScript, Ruby, Python, and Java
• Overview of the Go ecosystem
• Introduction to the Go standard library
• Go modules and managing dependencies
• Structure of a Go application
• Practical exercise: Analyze and execute a basic Go program

2. Configuring the Go Development Environment

• Installation of Go
• Components of the Go toolchain
• Setting up environment variables
• Selecting an IDE or code editor
• Interacting with Go via the command line
• Establishing a Go workspace
• Standard Go project layout
• Starting a project using Go Modules
• Utilizing go mod init
• Handling dependencies with go get
• Updating and reviewing dependencies
• Standardizing code style with gofmt
• Executing programs using go run
• Compiling applications with go build
• Installing Go applications
• Compiling for cross-platform compatibility
• Practical exercise: Initialize and set up a Go project within a container

3. Go Variables, Constants, and Data Types

• Variable declaration
• Explicitly defined types versus inferred types
• Short-form variable declaration
• Constant definitions
• Zero values
• Variable scope and lifetime
• Basic data types:
  • Integers
  • Floats
  • Complex numbers
  • Booleans
  • Strings
• Type casting
• Handling Unicode and UTF-8
• Differences between Runes and bytes
• Assigning multiple variables simultaneously
• Concepts of type safety
• Task: Develop a basic command-line tool for data processing

4. Operators and Expressions

• Arithmetic operations
• Comparison operators
• Logical operators
• Assignment operators
• Increment and decrement operators
• Precedence of operators
• Performing calculations with integers and floats
• Mitigating common type conversion errors
• Task: Code calculation and validation logic

5. Dates, Times, and Formatting

• Utilizing the time package
• Generating and adjusting dates
• Retrieving the current time
• Handling time zones and locations
• Interpreting date and time strings
• Formatting date and time output
• Calculating time differences
• Working with Unix timestamps
• Managing timeouts
• Task: Integrate timestamps and duration calculations into an application

6. Arrays, Slices, Maps, and Structs

Arrays

• Declaring arrays
• Initializing arrays
• Looping through arrays
• Multi-dimensional arrays

Slices

• Differences between slices and arrays
• Creating slices
• Adding elements
• Duplicating slices
• Understanding slice length and capacity
• Creating sub-slices
• Frequent issues with slices

Maps

• Instantiating maps
• Inserting and deleting entries
• Verifying key presence
• Iterating through maps
• Maps with complex data values

Structs

• Defining structs

• Struct members

• Initializing structs

• Nested structs

• Anonymous structs

• Methods associated with structs

• JSON tags for structs

• Practical exercise: Represent users, products, and application data using structs, slices, and maps

7. Conditional Logic and Loops

• if statements
• else and else if constructs
• Declaring variables inside conditions
• for loops
• Infinite loops
• Loop termination conditions
• break and continue statements
• Iteration using range
• Nested loops
• switch statements
• Expression-based switches
• Handling multiple cases
• Default cases
• Type switches
• Task: Code validation and processing logic for an application

8. Functions

• Defining functions
• Function parameters
• Return values
• Multiple return values
• Named return values
• Variadic functions
• Anonymous functions
• Functions as values
• Closures
• Recursion
• Passing functions as arguments
• Functions that return errors
• Designing small, reusable functions
• Task: Refactor existing code into reusable functions

9. Pointers and Memory Concepts

• Definition of a pointer
• Address-of and dereference operators
• Pointers and function parameters
• Pointer receivers
• Pointers to structs
• Nil pointers
• When to utilize pointers
• Value vs. reference semantics
• Go memory management and garbage collection
• Frequent pointer errors
• Practical exercise: Modify application data using pointers

10. Building a Web Application with Go

• Overview of Go's web capabilities
• Introduction to the net/http package
• Setting up an HTTP server
• Handling HTTP requests and responses
• HTTP methods
• Request URLs and query parameters
• HTTP headers
• HTTP status codes
• Basics of routing
• Creating handlers
• Processing form data
• Serving static files
• Using HTML templates
• Template variables and control structures
• Architecting a web application
• Practical exercise: Develop a fundamental Go web server

11. Building a RESTful Web Service

• Fundamentals of REST architecture
• Designing API endpoints
• GET, POST, PUT, PATCH, and DELETE methods
• Working with JSON
• Encoding and decoding JSON
• Request validation
• HTTP status codes
• Error responses
• Query and path parameters
• Structuring API responses
• Separating handlers from business logic
• Practical exercise: Create a CRUD REST API

12. Go Runtime, Compilation, and Project Builds

• How the Go compiler works
• The Go build process
• go run
• go build
• go install
• go test
• Build flags
• Environment-specific settings
• Building for various OS and architectures
• Creating standalone binaries
• Managing application configuration
• Task: Compile the application for multiple platforms

13. Handling Files and Web Data

• Opening and closing files
• Reading files
• Writing to files
• Creating directories
• File metadata
• Buffered Input/Output
• Working with streams
• Reading and writing JSON files
• HTTP clients
• Making outbound HTTP requests
• Handling HTTP client errors
• Timeouts and cancellation
• Processing API responses
• Practical exercise: Fetch data from an external API and save it locally

14. Error Handling and Debugging

• Go's error handling paradigm
• Returning errors from functions
• Checking for errors
• Creating custom errors
• Wrapping errors
• Adding context to errors
• errors.Is and errors.As
• Panic and recovery
• Appropriate use of panic
• Debugging common Go issues
• Logging application activity
• Utilizing Go debugging tools
• Task: Identify and resolve intentionally introduced application errors

15. Interfaces and Abstraction

• Definition of an interface
• Implicit interface implementation
• Defining interfaces
• Interface values
• Empty interfaces / any
• Type assertions
• Type switches
• Pointer vs. value implementations
• Designing small interfaces
• Dependency inversion
• Using interfaces for testing
• Reducing application coupling
• Practical exercise: Integrate interfaces into the sample web application

16. Packages and Project Organization

• Creating packages
• Package naming standards
• Exported vs. unexported identifiers
• Importing packages
• Package initialization
• Organizing application layers
• Internal packages
• Managing dependencies with Go Modules
• Semantic versioning
• Using third-party packages
• Avoiding circular dependencies
• Designing maintainable Go projects
• Task: Refactor the application into separate packages

17. Concurrency with Goroutines

• Concept of concurrency
• Goroutines
• Starting goroutines
• Understanding lightweight concurrent execution
• Synchronization challenges
• Shared state
• Race conditions
• Using sync.WaitGroup
• Mutexes and read/write mutexes
• Atomic operations
• Practical exercise: Transform a sequential task into concurrent processing

18. Channels

• Understanding channels
• Sending and receiving values
• Buffered vs. unbuffered channels
• Blocking behavior
• Closing channels
• Ranging over channels
• Directional channels
• Channel-based communication
• Select statements
• Timeouts and cancellation
• Worker-pool patterns
• Producer/consumer patterns
• Practical exercise: Develop a concurrent worker system

19. Context and Request Management

• Importance of contexts in web applications
• context.Context
• Request-scoped context
• Cancellation
• Deadlines
• Timeouts
• Propagating context through application layers
• Cancelling database or HTTP operations
• Avoiding context misuse
• Task: Implement request cancellation and timeouts in the web application

20. Testing Go Applications

• Significance of automated testing
• Writing unit tests
• The testing package
• Test functions
• Test naming standards
• Table-driven tests
• Testing errors
• Testing HTTP handlers
• HTTP test servers
• Test fixtures
• Test coverage
• Benchmarks
• Example tests
• Testing interfaces with mocks or fakes
• Practical exercise: Create a test suite for the sample application

21. Performance Optimization

• Understanding Go application performance
• Identifying bottlenecks
• CPU vs. memory performance
• Efficient data structures
• Reducing unnecessary allocations
• Strings, bytes, and buffers
• Goroutine management
• Avoiding excessive concurrency
• Caching strategies
• Database and network considerations
• Profiling applications
• Benchmarks and performance testing
• Using Go's profiling tools
• Task: Profile and optimize a deliberately inefficient application

22. Security and Robust Web Application Practices

• Validating user input
• Safe handling of HTTP requests
• Preventing common web vulnerabilities
• Secure error handling
• Authentication and authorization concepts
• Managing secrets and configuration
• Secure HTTP communication
• Avoiding sensitive information in logs
• Dependency management and updates
• Resource limits and request timeouts
• Task: Review and secure the sample API

23. Application Logging and Observability

• Logging fundamentals
• Structured logging
• Log levels
• Request logging
• Error logging
• Correlation and request IDs
• Monitoring application behavior
• Basic metrics
• Health-check endpoints
• Diagnosing production problems
• Practical exercise: Add structured logging and health checks

24. Containerizing the Go Application

• Benefits of using containers
• Go applications and containerization
• Writing a Dockerfile
• Multi-stage builds
• Building a minimal runtime image
• Managing configuration through environment variables
• Container networking
• Exposing application ports
• Running the application in a container
• Testing the containerized application
• Practical exercise: Package the sample Go application as a production-ready container

25. Deployment

• Preparing an application for production
• Building production binaries
• Environment configuration
• Container-based deployment
• Deployment architecture
• Reverse proxies
• HTTPS/TLS considerations
• Application health checks
• Graceful shutdown
• Handling operating-system signals
• Scaling Go web applications
• Horizontal vs. vertical scaling
• Basic deployment troubleshooting
• Practical exercise: Deploy the sample web application

26. Capstone: Complete Go Web Application

Participants synthesize the learned concepts by developing a complete application.

The project may include:

• Project initialization with Go Modules
• Package organization
• HTTP routing
• REST API endpoints
• JSON request and response handling
• Input validation
• Error handling
• Interfaces
• Concurrent processing
• External API communication
• File or database persistence
• Automated tests
• Logging
• Performance considerations
• Containerization
• Production configuration
• Deployment

27. Review and Best Practices

• Review of core Go syntax
• Go coding standards
• Writing idiomatic Go
• Maintaining code simplicity
• Effective package design
• Error-handling best practices
• Interface design principles
• Concurrency best practices
• Testing strategies
• Performance considerations
• Maintainability and readability
• Common mistakes made by new Go developers
• Recommended approaches for continuing Go development

28. Conclusion

• Recap of key concepts
• Review of the completed web application
• Questions and discussion
• Troubleshooting common real-world scenarios
• Recommended next steps for Go development
• Additional Go libraries and ecosystem resources
• Further opportunities for building production-grade Go services