Instruct: Classify a given review into positive or negative sentiment.
Query: A really useful explanation of the R6RS standard

Thi book provides a comprehensive and well-explained presentation of the Scheme programming language as described in R6RS. Although the documents for R6RS are publicly available [...], this book is far more readable and understandable. Every concept is explained through small code samples (unlike the R6RS documents), which helps a lot in understanding how things work. Also, at the end of each chapter there are many interesting exercises (some not trivial at all).This Scheme book might not be as innovative as others, and textbooks likeStructure and Interpretation of Computer Programs, Second Editionbetter explain how to properly use Scheme's unique features. But it is a book that should stand on the bookshelf of any R6RS programmer. I will surely use it many times as a reference.