Professor Frisby's Mostly Adequate Guide to Functional Programming

This is a book on the functional paradigm in general. We'll use the world's most popular functional programming language: JavaScript. Some may feel this is a poor choice as it's against the grain of the current culture which, at the moment, feels predominately imperative. However, I believe it is the best way to learn FP for several reasons: You likely use it every day at work. This makes it possible to practice and apply your acquired knowledge each day on real world programs rather than pet projects on nights and weekends in an esoteric FP language. We don't have to learn everything up front to start writing programs. In a pure functional language, you cannot log a variable or read a DOM node without using monads. Here we can cheat a little as we learn to purify our codebase. It's also easier to get started in this language since it's mixed paradigm and you can fall back on your current practices while there are gaps in your knowledge. The language is fully capable of writing top notch functional code. We have all the features we need to mimic a language like Scala or Haskell with the help of a tiny library or two. Object-oriented programming currently dominates the industry, but it's clearly awkward in JavaScript. It's akin to camping off of a highway or tap dancing in galoshes. We have to bind all over the place lest this change out from under us, we don't have classes[^Yet], we have various work arounds for the quirky behavior when the new keyword is forgotten, private members are only available via closures. To a lot of us, FP feels more natural anyways. That said, typed functional languages will, without a doubt, be the best place to code in the style presented by this book. JavaScript will be our means of learning a paradigm, where you apply it is up to you. Luckily, the interfaces are mathematical and, as such, ubiquitous. You'll find yourself at home with swiftz, scalaz, haskell, purescript, and other mathematically inclined environments. gitbook-cli is a terribly broken piece of software so I decided to upload this book here as well for easier download (mj\_ad). Introduction Chapter 01: What Ever Are We Doing? Chapter 02: First Class Functions Chapter 03: Pure Happiness with Pure Functions Chapter 04: Currying Chapter 05: Coding by Composing Chapter 06: Example Application Chapter 07: Hindley-Milner and Me Chapter 08: Tupperware Chapter 09: Monadic Onions Chapter 10: Applicative Functors Chapter 11: Transform Again, Naturally Chapter 12: Traversing the Stone Appendix A: Essential Functions Support Appendix B: Algebraic Structures Support Appendix C: Pointfree Utilities