Koen van Gilst

Why mocking all external requests for your app is worth it.

Why index barrel files can lead to large bundle sizes

A simple principle to help structure code better

A photograph taken in Altenstein, Germany

A photograph taken in Altenstein, Germany

A Twitter bot that tweets the latest vaccination progress for the Netherlands.

A web app built during the Covid-19 lockdown that helps parents and elementary school children create lessons collaboratively.

Tutorial on how to create a scroll video effect using Svelte’s powerful bind command.

A new year, a new JavaScript framework!

A first look at the state management library mobx-state-tree and a comparison with Redux Saga.

A collection of great programming quotes

Last week I learned a few things about how redirects and 303 status codes are handled in the browser.

How to let screenreaders read the title of an SVG using React

196 bytes of minimal CSS

Stuff I don't want to forget from the Book Programming TypeScript.

Git commands I keep forgetting

An intro to the React hooks useState, useRef and useEffect

Weekend project to learn more about Mobx State Tree.

Accelerate gives a scientific analysis of what makes IT organizations successful.

Review of a book for programmers who have always considered CSS to be an (unpleasant) afterthought

I thought it might be (mildly) interesting to keep track of how the NPM node_modules folder grows over time.

Progressive Web App for kids, based upon the classical piece "Peter and the Wolf" by Prokofiev.

I made this app to test what you can accomplish with current PWA technology (especially on iOS).

Testing async API calls using Jest’s mocking features

Star Wars or Star Trek?

Star Wars or Star Trek?

A fun little tutorial of how to create a PDF using a web form, Express and PDFKit

A Twitter bot that creates daily timelapse videos of the traffic jams in the Netherlands.

A Twitter bot raising emoji money for his trip around the world.

A simple web app for translators that converts a price per word to a price per standard line (55 characters).

Twitter bot inspired by @congressedits that monitors and Tweets any edits made to Wikipedia by the Dutch government.

A photograph taken in Huacachina, Peru

A photograph taken in Huacachina, Peru

A photograph taken in Les Deux Alpes, France

A photograph taken in California, USA

A photograph taken in Everdingen, Netherlands

A photograph taken in Cologne, Germany

A photograph taken in Unterhaching, Germany

A photograph taken in Munich, Germany

A photograph taken in Munich, Germany

A photograph taken in Munich, Germany

A photograph taken in Unterhaching, Germany