Comment by apwheele

Here is my take -- if you wanted some sort of app that required complicated regression modelling to happen client side (and the data is not crazy big), this would be a decent option. So you just serve the html + javascript files, and client side computer does all the hard work.

Say a forecasting tool (pull down data dynamically, and then it auto-generates a forecast). Or smooth out some other noisy data and display in graphics.

There are probably a smattering of other current javascript libraries, but many complicated things will be supported right out of the box with this. (Looks to me they just compiled most packages on CRAN, I can install my R package I have mostly not touched in several years.)