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Go

Bytes, Runes, and Unicode in Go

Master Go's string model — how UTF-8 encoding works, when to use bytes vs runes, correct iteration, unicode/utf8 package functions, and the performance tradeoffs of []byte vs …

Go

Code Coverage and Quality Metrics in Go

Master Go code coverage — go test -cover, coverage profiles, HTML reports, per-function analysis, enforcing coverage thresholds in CI, golangci-lint configuration, and interpreting …

Go

Code Generation in Go

Master Go code generation — go:generate directives, stringer for enums, mockgen for test doubles, sqlc for type-safe SQL, writing custom generators with text/template and go/ast, …

Go

Command-Line Parsing and Flags in Go

Master Go's flag package — defining flags, custom flag types, subcommands, environment variable fallback, validation patterns, and when to reach for Cobra instead.

Go

Compiler Optimizations and Inlining

Master Go compiler optimizations including function inlining, dead code elimination, and compiler directives. Learn how to write code that compiles efficiently.

Go

Concurrency Performance Tuning in Go

Optimize concurrent Go programs — goroutine pool sizing, channel buffer tuning, atomic operations, lock contention reduction, batch processing, and profiling with pprof.

Go

Configuration Management in Go

A complete guide to Go configuration management — environment variables, Viper, config file formats, secrets management, feature flags, hot reload, and production validation …

Go

Constants and Enumerations in Go

Master Go constants and enumerations — const declarations, untyped vs typed constants, iota patterns for enums and bit flags, String() methods, and why typed enums prevent bugs …

Go

Creational Design Patterns in Go

Master creational design patterns in Go — Singleton with sync.Once, Factory functions, Builder with functional options, Abstract Factory, and Object Pool with sync.Pool. Practical …