Article: On JavaScript’s Weirdness by Konstantin Wohlwend

Man, this article blew my mind - JS can be really crazy at times. I don’t see this often in my work, but cool to dive into nonetheless.

Sparse arrays

Never heard of these before, but they actually make sense when you consider that arrays in JS are just a special type of object. Konstantin’s example of using Object.entries on a sparse array really made the concept click in my head.

The secret 9th falsy object

The secret 9th falsy object is… document.all? Of course it was used to make Internet Explorer-specific code, then made falsy to migrate away from it. Gotta love IE!

Internet Explorer image

The other points (especially #2 and #6) looked like something I would have seen in a computer science lecture during my time at university. Cool stuff!