Embedded JavaScript and WebAssembly Engine for R
An R interface to V8: Google's open source JavaScript and WebAssembly engine. This package can be compiled either with V8 version 6 and up or NodeJS when built as a shared library.
About the R package:
To see some quick examples in R run:
Binary packages for OS-X or Windows can be installed directly from CRAN:
On Linux you need a suitable libv8 installation, see below.
On amd64/arm64 Linux/MacOS platforms it is possible (and recommended) to automatically download a suitable static build of libv8 during package installation. This is enabled by default on Ubuntu, RHEL, and MacOS. For other systems you can opt-in by setting an environment variable DOWNLOAD_STATIC_LIBV8 during installation, for example:
Sys.setenv(DOWNLOAD_STATIC_LIBV8 = 1)
install.packages("V8")
This way, you can install the R package on any x64 Linux system, without external system requirements. Alternatively, it is also still possible to install libv8 from your distribution as described below. This may be needed for servers running other architectures, or when building the R package without internet access.
Installation from source on Linux requires libv8. On Ubuntu / Debian you need to install either libv8-dev, or libnode-dev. On the latest systems, libv8-dev is actually an alias for libnode-dev so they are the same:
# Debian and Ubuntu sudo apt-get install -y libv8-dev
On Fedora we need v8-devel (which Fedora provides as part of nodejs):
sudo yum install v8-devel
On CentOS 7 / RHEL 7 we install first need to enable EPEL:
sudo yum install epel-release sudo yum install v8-devel
On RockyLinux 8 / RHEL 8, v8-devel can be installed from the nodejs:16-epel module repository:
yum --refresh --enablerepo=epel-testing-modular install @nodejs:16-epel/minimal v8-devel
Arch users are advised to install the v8-r package, which has been configured to work well with R. Installation can done through your preferred AUR helper such as yay, Trizen, etc. However, since V8 contains a large codebase and (re-)compilation takes a while, users may prefer to build and update it manually. For example,
## Arch cd /tmp yay -G v8-r cd v8-r makepkg -si
On OS-X use v8 from Homebrew:
But it is much easier to set DOWNLOAD_STATIC_LIBV8 instead.
# Create a new context
library(V8)
ctx <- v8()
# Evaluate some code
ctx$eval("var foo = 123")
ctx$eval("var bar = 456")
ctx$eval("foo+bar")
# Assign / get objects
ctx$assign("foo", JS("function(x){return x*x}"))
ctx$assign("bar", JS("foo(9)"))
ctx$get("bar")
Call functions from JavaScript libraries
ctx <- V8::v8()
ctx$source("https://cdnjs.cloudflare.com/ajax/libs/coffee-script/1.4.0/coffee-script.min.js")
jscode <- ctx$call("CoffeeScript.compile", "square = (x) -> x * x", list(bare = TRUE))
ctx$eval(jscode)
ctx$call("square", 9)
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