Learn You a Haskell for Great Good! (LYAH!) is a fun, illustrated guide to learning Haskell, a functional programming language that's growing in popularity. LYAH! introduces programmers familiar with imperative languages (such as C++, Java, or Python) to the unique aspects of functional programming. Packed with jokes, pop culture references, and the author's own hilarious artwork, LYAH! eases the learning curve of this complex language, and is a perfect starting point for any programmer looking to expand their horizons. The well-known web tutorial on which this book is based is widely regarded.