Engineering

After 15+ years of using TLA+, I now think of it is a design accelerator. One of the purest intellectual pleasures is finding a way to simpl...

Testing Rails Controllers with ActionDispatch::TestRequest Learn how to effectively test your Rails controllers using ActionDispatch::TestRequest. This code snippet demonstrates how to interact with …

It’s tempting to think of Baseline as creating a hard line. If a feature isn’t Baseline, then it’s not ready for use. However, we all know that web development is a world of “it depends”.

How getting involved in npmx made me a better developer

Opinion: Google knows asking agents to navigate GUIs designed for humans is ridiculous. Microsoft might not

Let's dive into the React fundamentals. This will help us build up a solid mental model that will allow us to understand what happens when react updates the UI.

Accessibility advice around modals have commonly taught us to trap focus within the modal. Upon further research, it seems like we no longer need to trap focus within the (even in modal mode).

In a typical imperative application, business logic and side effects are inextricably linked. For example, when you write await db.checkInventory(…), the runtime immediately reaches out to the database. Our Effect System works differently. Instead of performing the action, our functions return a description of the action. When our code needs to check inventory, it doesn’t call the database; it returns a plain object instead, which will be executed later by an interpreter.

investment portfolios which occupy the 'efficient' parts of the risk-return spectrum;set of portfolios which satisfy the condition that no other portfolio exists with a higher expected return but with the same standard deviation of return

The hardest part of web standards isn’t even the technology — it’s the queues. And that’s the real problem I keep coming back to.

Ruby on Rails' famous blog in 15 minutes now runs right in your browser thanks to WebAssembly.

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The Invoker Commands API provides a way to declaratively assign behaviors to buttons, allowing control of interactive elements when the button is enacted (clicked or invoked via a keypress, such as the spacebar or return key).

oavif is a new approach to target quality encoding in image compression, designed around smarter convergence strategies and quicker scoring to be as fast as possible.

The famous "faster horses" quote isn't wrong because users can't imagine solutions—it's wrong because it defends lazy research.

Introduction

State in the url in React (the right way) State management should be easy. It’s hard if not performed properly. Putting state in the url can be tricky if one doesn’t use a proper pattern. Routing …

In this post, we’ll benchmark and analyze the most used view rendering options, the optimizations Rails provides, and when it makes sense to use each alternative (or not).

Learn how to optimize your local development environment with Next.js.

There are books & many articles online, like this one arguing for using Postgres for everything. I thought I’d take a look at one use case - using Postgres instead of Redis for caching. I work with APIs quite a bit, so I’d build a super simple HTTP server that responds with data from that cache. I’d start from Redis as this is something I frequently encounter at work, switch it out to Postgres using unlogged tables and see if there’s a difference.

Learn how to manage state in modern React apps, what is remote, URL, local, and shared state, and when you actually need a state management library.

Real cleanup in a big Nx monorepo. I used Knip to flag unused deps, verified removals, handled false positives, and shaved about a minute off yarn install with lower CVE risk.

The standard techniques of good development can lead you astray if you don't adjust them for unit tests.