If a program element is hard to test, move as much logic as possible out into testable collaborators.

“Every line of code is written without reason, maintained out of weakness, and deleted by chance” Jean-Paul Sartre’s Programming in ANSI C.

Shared from my personal experience as a software developer at Volvo Cars.

Learn about our journey with caching in Next.js App Router.

An API definition is more than just a technical document; it's a comprehensive blueprint that outlines an API's structure, functionality, and behavior.

Since the beginning, GitHub.com has been a Ruby on Rails monolith. Today, the application is nearly two million lines of code and more than 1,000 engineers collaborate on it daily.…

When we talk about computers and programming, we often encounter algorithms. Algorithms are like instructions that help computers perform…

It is ok to experiment. Usually good codebases need standards and rules to speed up collaboration and more in general to facilitate expansion. Some of those are enforced at the language or community level via formatter, linters. Others got introduced step by step from previous contributors.

Design Patterns are typical solutions to commonly occurring problems in software design. They are blueprints that you can customize to solve a particular design problem in your code.

Essential concepts and practical applications

An explainer for doing web development using only vanilla techniques.

Incrementally modernizing our frontend infrastructure to roll out the latest React features without downgrades

Thinking in systems is a trait of the greatest minds. Now, you can gain a new perspective, noticing and understanding the systems around you.

I want to provide a smooth experience to my site visitors, so I work on accessibility and ensure it works without JavaScript enabled. I care about page load time because some pages contain large illustrations, so I minify my HTML. But one thing makes turning my blog light as a feather a pain in the ass.

Caution: If you are a senior Ruby developer, this article may hurt your feelings.

Learn how to build a Progressive Web Application (PWA) with Next.js.

Exploring the web's clipboard APIs, their limitations, and their history.

Although JavaScript regexes used to be underpowered compared to other modern flavors, numerous improvements in recent years mean that’s no longer true. Steven Levithan evaluates the history and present state of regular expressions in JavaScript with tips to make your regexes more readable, maintainable, and resilient.

parseMedia() is able to extract tracks and samples from audio and video in a format that is suitable for usage with WebCodecs APIs.

Server Components

A comprehensive guide to understanding the differences between export default and named exports in JavaScript

Create diagrams and visualizations using text and code.

Hello~ today I will to share a post about different ways of passing functions in Ruby. There are many ways to pass code around in Ruby, so today I’m going to make a comparison between the 4 different ways. In this post, I will show the syntax of ...

When I was first starting out in software engineering, it felt like there was a never-ending barrage of tooling to learn. After more than a decade in CLI environments, I still find myself constantly learning new features and fun facts - but it’s fairly rare that I learn something new that I end up using day-to-day. I wanted to share some things I learned at relatively late stages in the game that ended up being significant productivity boosters for me - perhaps some of them are well-known, but in the spirit of this XCKD, I hope that someone reading this might pick up something new.

K2 is a new verification approach and framework that enables developers to build hardware security modules (HSMs) with high assurance through formal verification.

Look at the gif below. It shows a proof-of-concept implementation of collaborative undo-redo,...