Our book, Functional Programming in Scala, relies heavily on exercises. Hints and answers for those exercises are not actually in the book, but are freely available on GitHub under a permissive MIT license. Likewise, we have written chapter notes that we reference throughout the book and made them available as a community-editable wiki.

Naturally, readers get the most out of this book by downloading the source code from GitHub and doing the exercises as they read. But a number of readers have...