Advanced R by Hadley Wickham

Advanced R is a thorough online book and educational resource created by Hadley Wickham, one of the most influential R developers. It serves as an in-depth guide to understanding how R works under the hood, covering metaprogramming, functional programming, object-oriented systems, and performance optimization. The book is built using bookdown, an R package for creating dynamic, professional technical documentation. It's designed for intermediate to advanced R programmers who want to deepen their understanding of the language's architecture, improve their coding practices, and write more efficient, maintainable code. The resource combines theoretical concepts with practical examples, making it valuable for data scientists, statisticians, software engineers, and R package developers seeking to master advanced programming techniques.