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Wasm comes to R

Posit (formerly RStudio) today released an early version of an R package that brings WebAssembly (Wasm) to R.
Aimed at developers, the WebR package (available at “is a version of the open-source R interpreter compiled for WebAssembly, along with a supporting [JavaScript] TypeScript library,” Posit’s George Stagg wrote in a blog post this morning.
“Absolute game changer of an #RStats package,” Bruno Rodrigues, author of the chronicler R package, said in a post on Mastodon.
The project includes a webR kernel for the JupyterLite Wasm project for Jupyter notebooks. That means users of JupyterLite can now run R code as well as Python in their notebooks. You can see that implemented at:
The package includes a demo Web-based interactive R console. A version of that console is currently online at:
Creators of WebR envision package developers using the Web console in online documentation, so those interested in a package could try it out without having to install it locally or run installation in the cloud.
In addition, it could have a number of uses in education and training. And, Stagg wrote, it offers the potential for a version of Shiny Web framework for R that wouldn’t require an R server. The new Shiny for Python already doesn’t require a server.

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