JavaScript

How to Use the React Profiler Component to Measure Performance Improvements from Hooks

Jest unit testing for React.js

It’s common knowledge at this point that unit tests have a variety of benefits. In this post I’ll be describing my trials and triumphs implementing Jest unit testing for React.js. Three aspects I grappled with while developing Jest-based testing were customizable defaults…

How We Added Time Travel to Paperless Post

Our designers make our cards beautiful, but our users make them unique. To help them, we’ve built a card editing tool that allows extensive customization. And customize they do: over and over, we’ve seen our users stretch the limits of the design system…

Functional Concepts for Practical Coders

ActionScript and JavaScript support a lot of fancy concepts like closures, partial application, filter chaining, and function composition. Without a background in functional programming, it might not be clear to you what those things are, or why you’d want to…

Why We Patched node.js

At a company that relies on open source software, every day is an adventure. This week: how a memory fragmentation issue in node.js tempted me into the wilds of the V8 JavaScript Engine and C++.