Gabor Koos

@gkoos

Practical Go, JS, and TS tutorials.

London, UKJoined August 2025

About

Software engineer, open-source contributor, and tech writer. I write about Golang, TS/JS, algorithms, coding best practices, and real-world engineering solutions.

Gabor Koos's blogs

the Pocket Gopherpocketgopher.hashnode.dev12 posts

freeCodeCamp Englishfreecodecamp.org/news6 posts

Recently published

pocketgopher.hashnode.dev

Unit Testing in Go - A Beginner's Guide

My latest FreeCodeCamp article covers unit testing in Go, why it matters, and practical examples for writing cleaner, more testable code. Check it out here: https://www.freecodecamp.org/news/unit-testing-in-go-a-beginners-guide/

Jan 141 min read

freecodecamp.org

Unit Testing in Go - A Beginner's Guide

If you're learning Go and you’re already familiar with the idea of unit testing, the main challenge is usually not why to test, but how to test in Go. Go takes a deliberately minimal approach to testing. There are no built-in assertions, no annotatio...

Jan 1215 min read

pocketgopher.hashnode.dev

The Go Build System: Optimised for Humans and Machines

Introduction: The Illusion of Simplicity You probably type go build or go run dozens of times every week without thinking much about what happens under the hood. On the surface, these commands feel almost magical: you press Enter, and suddenly your c...

Jan 918 min read

freecodecamp.org

How to Use Closures in Go

If you've written code in JavaScript, Python, or Rust, you've probably heard the word closure before. The concept has subtle differences in each language, but the core idea is the same: a closure is a function that captures variables from its surroun...

Oct 27, 202514 min read

pocketgopher.hashnode.dev

Garbage Collection in Go: From Reference Counting to Tri-Color to Green Tea

Introduction Garbage collection (GC) is one of the most critical components of any modern programming language runtime. It decides how and when memory is reclaimed, directly impacting latency, throughput, and the overall responsiveness of application...

Oct 12, 202515 min read

Search Hashnode

Gabor Koos

About

Gabor Koos's blogs

Recently published

Unit Testing in Go - A Beginner's Guide

Unit Testing in Go - A Beginner's Guide

The Go Build System: Optimised for Humans and Machines

How to Use Closures in Go

Garbage Collection in Go: From Reference Counting to Tri-Color to Green Tea