Justlike online jupyter notebooks, You also something called Observable for d3.js
https://beta.observablehq.com/
This is a javascript notebook.
Another alternative to that is Block Builder http://blockbuilder.org/
Observable Tests
Justlike online jupyter notebooks, You also something called Observable for d3.js
https://beta.observablehq.com/
This is a javascript notebook.
Another alternative to that is Block Builder http://blockbuilder.org/