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What is Advanced R by Hadley Wickham?

Advanced R is a free online book that teaches intermediate and advanced programming techniques in R. Written by Hadley Wickham, a prominent statistician and R developer, it covers functional programming, object systems, metaprogramming, and performance optimisation. The book is designed for people who already know R basics and want to understand how the language works under the surface. Rather than offering graphical interfaces or automated analysis, it provides detailed explanations and code examples you can work through yourself. It's particularly valuable for data scientists, statisticians, and software engineers who need to write more efficient R code or understand R's design principles.

Key Features

Free online textbook with chapters on R's core concepts

Code examples you can copy and experiment with locally

Coverage of functional programming paradigms in R

Explanation of R's object systems and class structures

Guidance on performance profiling and code optimisation

Metaprogramming and non-standard evaluation techniques

Pros & Cons

Advantages

  • Completely free to read and access online
  • Written by Hadley Wickham, creator of influential R packages like ggplot2 and dplyr
  • Goes beyond surface-level explanations to explain how R actually works
  • Practical code examples you can run and modify yourself
  • Regularly updated with new material

Limitations

  • Requires existing knowledge of R; not suitable for beginners
  • No interactive exercises or automated feedback on your code
  • Self-directed learning; you need discipline to work through material

Use Cases

Learning to write faster, more efficient R code for large datasets

Understanding R's object-oriented and functional programming systems

Developing R packages and understanding package design patterns

Debugging complex R programs by understanding language internals

Preparing for advanced data science or statistics roles requiring deep R knowledge