https://www.youtube.com/watch?v=db-7J5OaSag
RiftSketch is a web-based live coding environment for Virtual Reality.
It lets you code a "sketch" in JavaScript, using ThreeJS, while the world around you changes immediately as you code.
It's quite a niche application since you need to have a VR headset, be able to touch-type, be a JavaScript programmer and be sufficiently familiar with Three.js but if you meet that criteria it's surprisingly fun and engaging!
If you happen to have a VR headset with a WebXR compatible browser, try it by visiting http://brian.peiris.io/RiftSketch
$ npm ci
$ npm run start