Redowan's Reflections

Dependency injection in Go doesn't need Dig or Wire. Learn why manual wiring beats reflection magic and how Go's design makes DI frameworks overkill.

Prevent dangerous struct copies with noCopy sentinel and go vet's copylock checker. Protect mutexes and sync primitives from value copies.

Pin tool versions in Go 1.24 with the new 'tool' directive. Replace tools.go pattern with native go.mod support for project tooling.

Test functions that write to stdout/stderr in Go by capturing output with os.Pipe. Learn patterns to avoid deadlocks in concurrent tests.

Return teardown closures from test helpers to manage cleanup elegantly. Learn patterns for temp files, mock servers, and t.Cleanup() usage.

Compare three Go slice sorting methods: sort.Interface, sort.Slice with closures, and modern generic slices.Sort with type safety.

Debug tricky nil comparisons in Go interfaces. Understand dynamic types, type assertions, and use reflect for generic nil checking.

Compare middleware stacking with embedded delegation in Go HTTP servers. Learn when to override ServeHTTP for simpler request handling.

Understand why io.Reader takes a byte slice parameter instead of returning one. Learn about heap allocations and buffer reuse in Go streams.

Avoid common Go slice mistakes: shared backing arrays, nil vs empty slices, append behavior, and slice copying pitfalls explained.

Navigating the balance between building valuable domain expertise and avoiding over-specialization that limits career mobility.

Build multi-level rate limiting with Redis sorted sets and Lua. Enforce global and category-specific limits with ZREMRANGEBYSCORE and ZCARD commands.

Learn variable indirection in Bash with ${!var} syntax. Build context-aware configs, function dispatch, and dynamic variable name resolution.

Build a link blog without a backend using Hugo and markdown. Track reading, articles, and activities with yearly detail pages and RSS filtering.

Prevent multiple script instances with file locking. Use flock in Bash, fcntl in Python, and syscall.Flock in Go for single-instance processes.