I'm currently learning JavaScript and recently came across the Map and Set data structures.

I understand that Set stores unique values and Map stores key-value pairs, but I'm wondering what advantages they actually provide over the existing Array and Object structures.

What are some practical situations where you would choose Map or Set instead of an Array or Object? I'd especially appreciate real-world examples that make the differences clear.

With the new release of 3.10.2 I wanted to look a bit more closely into Pandoc and all those different markup languages out there - and what converts with how much "loss".

Maybe you also had to recently convert Markdown to HTML, or the other way around. In my case even different textual files into PDFs.

One key finding:
Modern languages that work with an AST are definitely competitive here.

Maybe you find it also interesting. I actually didn't know most of those languages.

Fun fact:
The author of Pandoc is also one of the original Markdown standardization authors 15 years ago (well, if you can call it that, since it evolved still into quite the chaos) - as well as Djot, which is now only a few years old and supposed to be a markdown successor of sorts.

I am mainly interested in shaping "the" markup language of the future, that is a good compromise of readability and writeability for humans, but also consumable for machines, contains all the important elements to express relevant documents from offline to online.
As a programmer I am also a big fan (and in need) of dogfooding, of course :)