Observable Beta (via) Observable just released their beta, and it’s quite something. It’s by Mike Bostock (d3), Jeremy Ashkenas (Backbone, CoffeeScript) and Tom MacWright (Mapbox Studio). The easiest way to describe it is Jupyter notebooks for JavaScript supporting reactive programming—so code is evaluated as you type and you can add interactive widgets (like sliders and canvas views) to construct explorable visualizations on the fly.
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