I've been putting some of my content in observablehq notebooks and it has been fun. You can play around with every code snippet (even the one that are "hidden").

This one was specially fun because there is form involve in the proccess.

• Using the Maybe type in js

Anywho, this what I got so far:

• (Array) Reduce: How and when
• Partial application in javascript
• Composition techniques
• About Functors
• Tagged unions and Fantasy Land