Advanced Golang Concepts Course

Lesson 1 • Go Runtime Architecture Overview

Examine the Go runtime's core components: scheduler, memory allocator, and garbage collector. This context anchors every advanced topic in the course.

Lesson 2 • Garbage Collector Internals

Explore the tri-color mark-and-sweep GC, write barriers, and GC pacing. This knowledge enables targeted performance tuning in later chapters.

Lesson 3 • Go Memory Model Fundamentals

Define the happens-before relationship and synchronization guarantees in Go. Correct mental models here prevent data races in later concurrency work.

Lesson 1 • Synchronization Primitives in Depth

Use sync.Mutex, RWMutex, WaitGroup, Once, and atomic operations correctly under contention. Proper primitive selection directly impacts throughput.

Lesson 2 • Goroutine Scheduler Deep Dive

Analyze the M:N scheduler, work-stealing, and preemption to predict goroutine behavior. This underpins correct design of concurrent pipelines.

Lesson 3 • Advanced Concurrency Patterns

Implement semaphores, worker pools, rate limiters, and errgroup for structured concurrency. These patterns compose the primitives from earlier sections.

Lesson 4 • Channel Patterns and Pitfalls

Design pipelines, fan-out, fan-in, and done-channel patterns using typed channels. Recognizing common misuse prevents goroutine leaks.

Lesson 1 • Generic Data Structures

Build generic stacks, queues, sets, and maps with correct constraint design. These structures demonstrate practical reuse across unrelated type families.

Lesson 2 • Constraints and Interface Unions

Define precise constraints using interface unions, underlying types, and comparable. Tight constraints produce safer, more expressive generic APIs.

Lesson 3 • Generics Performance and Limitations

Analyze GC shape stenciling, dictionary passing, and monomorphization trade-offs. Knowing limitations prevents misuse that degrades runtime performance.

Lesson 1 • Reflection with the reflect Package

Use reflect.Type and reflect.Value to inspect and manipulate types at runtime. Reflection enables generic serialization and dependency injection frameworks.

Lesson 2 • Code Generation as a Reflection Alternative

Generate type-safe boilerplate with go generate and AST-based tools to replace costly reflection. Generated code achieves reflection-like flexibility at zero runtime cost.

Lesson 3 • Interface Internals and iface Layout

Examine the iface and eface structures, itab caching, and nil interface pitfalls. Internal knowledge prevents subtle bugs in interface-heavy code.

Lesson 1 • Benchmarking with the testing Package

Write reliable benchmarks using testing.B, sub-benchmarks, and benchstat for statistical comparison. Rigorous benchmarking validates optimization impact objectively.

Lesson 2 • Memory Optimization Techniques

Reduce allocations using sync.Pool, struct field alignment, and slice pre-allocation. Each technique directly lowers GC frequency and pause times.

Lesson 3 • Profiling with pprof

Collect CPU, heap, goroutine, and block profiles using pprof and interpret flame graphs. Profiling is the mandatory first step before any optimization attempt.

Lesson 4 • Execution Tracer and Latency Analysis

Use the runtime execution tracer to diagnose scheduling latency, GC pauses, and syscall blocking. Trace analysis reveals concurrency bottlenecks invisible to pprof.

Lesson 1 • Sentinel Errors and Error Hierarchies

Define package-level sentinel errors and typed error hierarchies for domain-specific diagnostics. Consistent error taxonomy improves caller ergonomics across large codebases.

Lesson 2 • Mocking, Stubs, and Test Doubles

Design testable interfaces and inject mocks or stubs to isolate units under test. Interface-based injection enables fast, deterministic tests without real dependencies.

Lesson 3 • Table-Driven and Subtests

Structure comprehensive test suites with table-driven cases and t.Run subtests for isolation. This approach scales test coverage without duplicating setup logic.

Lesson 4 • Error Wrapping and Unwrapping

Use fmt.Errorf with %w, errors.Is, and errors.As to build inspectable error chains. Structured errors enable precise handling without string matching.

Lesson 1 • The unsafe Package

Use unsafe.Pointer, uintptr, and Sizeof for low-level memory manipulation with explicit safety rules. Unsafe operations are necessary for high-performance serialization and FFI.

Lesson 2 • CGo Performance and Alternatives

Measure CGo call overhead and evaluate syscall, purego, and shared library alternatives. Choosing the right FFI strategy balances performance, portability, and safety.

Lesson 3 • CGo Fundamentals

Call C functions from Go and export Go functions to C using CGo directives and type mappings. CGo enables integration with existing C libraries and OS-level APIs.

Lesson 1 • Graceful Shutdown and Signal Handling

Implement signal-aware shutdown sequences that drain in-flight requests and release resources cleanly. Graceful shutdown prevents data loss and connection errors during deployments.

Lesson 2 • Metrics and Distributed Tracing

Instrument services with OpenTelemetry metrics and traces to expose latency, error rates, and throughput. Instrumentation data drives SLO monitoring and incident diagnosis.

Lesson 3 • Resilience Patterns in Go Services

Apply circuit breakers, retries with backoff, and bulkheads to prevent cascading failures. These patterns make services self-healing under partial infrastructure outages.

Lesson 4 • Configuration and Dependency Injection

Manage configuration with environment variables, files, and validation; wire dependencies explicitly. Explicit wiring improves testability and eliminates hidden global state.