errgroup - Abrarqasim Blogs

Golang Error Handling: The %w Mistake I Shipped for a Year

I wrapped Go errors with %v for a year and broke errors.Is without noticing. The golang error handling rules I follow now, with before and…

Rayyan | August 11, 2026 | 8 min

Backend

Golang Concurrency in 2026: The Goroutine Leak I Kept Shipping

I found 41,217 leaked goroutines in one pprof dump. The Go concurrency patterns I actually ship in 2026: channel ownership, WaitGroup.Go, and errgroup.

Rayyan | August 8, 2026 | 7 min

Backend

Golang Concurrency Patterns 2026: errgroup and Context I Actually Ship

The Go concurrency patterns I actually reach for in 2026: errgroup instead of sync.WaitGroup, context cancellation everywhere, worker pools without cargo cult.

Rayyan | July 4, 2026 | 8 min

Go

Go Concurrency Patterns in 2026: What Go 1.25 Let Me Delete

Go 1.25 added WaitGroup.Go and a stable testing/synctest. Here are the Go concurrency patterns I actually use in 2026, and the boilerplate I deleted.

Rayyan | May 24, 2026 | 9 min

Backend

Go Error Handling: The Patterns That Stopped Me Hating if err != nil

The Go error patterns I actually use in production: fmt.Errorf %w wrapping, sentinel vs typed errors, errors.Is vs errors.As, and errgroup at scale.

Rayyan | May 14, 2026 | 8 min