#Func

Hello, Go enthusiasts. Welcome to the first installment of our deep dive into Golang Design...

Welcome back, Gophers ❤ In the first part of this series, we mastered the art of creation learning...

Welcome back, Gophers ❤. If you’ve followed along from our previous dives, you know that building a...

I build backend systems for a living. Most of what I ship runs on NestJS — TypeScript, async/await,...

Python Task Scheduler: Run Any Script Automatically (No Cron Needed) Cron is powerful but...

Go development has reached a stage of deep engineering maturity. When building modern applications in...

A mutable registry populated by init(), a session field leaking between evaluations, a validation...

Server.Shutdown is three stages, not one. The WebSocket trap, the background-goroutine trap, and the production drain pattern with errgroup.

t.Run + t.Parallel + t.Cleanup interact in ways most Go devs miss. Three cleanup-order rules and the table-test loop-capture trap.

Go 1.21's sync.OnceFunc / OnceValue / OnceValues vs sync.Once. When each is the cleanest, the error-return trap, init patterns.

http.RoundTripper is the right place for HTTP cross-cutting concerns. Composition pattern, wrap order, body-drain gotchas.

Go race detector output, decoded. Three real stack shapes (map race, loop-capture, interface pointer) and the fix that matches each.

iter.Seq[V] is the API. Custom iterators, the slices/maps ecosystem, a paginated client, and a filter+map+take pipeline.

Three Go concurrency primitives, three different jobs. A decision matrix with runnable code for fan-out, fail-fast, and back-pressure.

Three Go counters under contention. atomic wins for one hot counter. mutex is fine for batched updates. sync.Map almost never earns its keep.

defer wg.Wait() works for clean exits and falls apart on SIGTERM mid-flight. Here is a 60-line pool that drains in-flight work with a deadline.

SwiftData model design, AppStateManager state restoration, MarkdownRenderer Visitor pattern, Splash code highlighting, Keychain API key management, and automatic title generation with LLM.

Function-type factories, strategy factories, registration factories, functional options, and null...

Stop passing strings everywhere. Wrap every domain concept in its own Go type and the compiler kills a category of bugs you used to chase at runtime.

This article outlines five particularly useful Python decorators that, based on developers' experience, haven proven themselves effective to make AI code cleaner.