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About the Book
Modern R now executes most code in a stack-based virtual machine (VM).
The VM doesn't really see the R code a programmer writes - this R code is first parsed to an abstract syntax tree, which is then compiled to bytecode, and this bytecode is then executed in the VM.
This book is an introduction to this bytecode and a reference for the instructions it understands.
This book comes with a R package (called 'rbytecode') which includes an assembler and disassembler for R's bytecode.
About the Author
I'm just this guy.