In this book we will create a programming language together. We'll start with 0 lines of code and end up with a fully working interpreter for the Monkey* programming language. Step by step. From tokens to output. All code shown and included. Fully tested. Buy eBook for $29 Buy paperback for $39 eBook includes PDF, ePub, Mobi (Kindle) and HTML. Read a free sample. Current version: 1.7. Released 7.