It was a late evening.My colleague has just checked in the code that they’ve been writing all week. We were working on a graphics editor canvas, and they implemented the ability to resize shapes like rectangles and ovals by dragging small handles at their edge...

here are many articles written about React performance optimizations. In general, if some state update is slow, you need to:Verify you’re running a production build. (Development builds are intentionally slower, in extreme cases even by an order of magnitude.)...

Security is important. Nobody wants to be the person advocating for less security. So nobody wants to say it. But somebody has to say it.So I guess I’ll say it.The way npm audit works is broken. Its rollout as a default after every npm install was rushed, inco...

I wrote a bit of JSX in my editor:Hello, Alice!The fact that this works is a marvel of engineering.Deep inside of your browser, there are pieces of code that know how to display a paragraph or draw text in italics. These pieces of code are different between di...

During my first few years of using JavaScript, I felt like a fraud. Even though I could build websites with frameworks, something was missing. I dreaded JavaScript job interviews because I didn’t have a solid grasp on fundamentals.Over the years, I’ve formed a...

Suppose I want to display something on your screen. Whether I want to display a web page like this blog post, an interactive web app, or even a native app that you might download from some app store, at least two devices must be involved.Your device and mine.I...