Learning a computer language like R can be either frustrating, fun or boring. Having fun requires challenges that wake up the learner’s curiosity but also provide an emotional reward for overcoming them.

The book is designed so that it includes smaller and bigger challenges, in what I call playgrounds, in the hope that all readers will enjoy their path to R fluency. Fluency in the use of a language is a skill that is acquired through practice and exploration.

For students and professionals in the biological sciences, humanities and many applied fields, recognizing the parallels between R and natural languages should help them feel at home with R. The approach I use is similar to that of a travel guide, encouraging exploration and describing the available alternatives and how to reach them.

The intention is to guide the reader through the R landscape of 2024 and beyond. What is new in the second edition?Text expanded by more than 25% to include additional R features and gentler and more detailed explanationsContains 24 new diagrams and flowcharts, seven new tables, and revised text and code examples for clarityAll three indexes were expanded, and answers to 28 frequently asked questions addedWhat will you find in this book?Programming concepts explained as they apply to current REmphasis on the role of abstractions in programmingFew prescriptive rules―mostly the author’s preferences together with alternativesPresentation of the R language emphasizing the “R way of doing things”Tutoring for “programming in the small” using scripts for data analysisExplanation of the differences between R proper and extensions for data wranglingThe grammar of graphics is described as a language for the construction of data visualisationsExamples of data exchange between R and the foreign world using common file formatsCoaching to become an independent R user, capable of writing original scripts and solving future challenges.