Kinda but observable is more because the notebooks cells reactively recompute. And it's written in javascript and ran in a browser so you have the languages proper development tooling integrated (e.g. chrome Dev tools). And you can easily share it as its the web.

> observable is more

Hm, that's really relative... on Babel, you can also have reactive cells, and while it's true that having Obervable run on the web + JS is great, I could say that Babel "is more" because it supports pretty much any language, not only JS, and does not require an internet connection to work.

How would programmers even keep themselves busy (I was going to type ‘get promoted’) if they stopped reinventing things badly?