I was very excited to receive my copy of Functional JavaScript by Michael Fogus as I am interested in, and have views on, both Functional programming and JavaScript. My view of the functional programming community is that it is full of very clever people who are focused on creating software which is robust and malleable. This is probably because the concepts behind functional programming are hard to understand. It is also because it has a closer relationship to various branches of mathematics. My opinion of JavaScript is that it is the most ubiquitous programming language we have ever known. It is a language with some good features, but it has to be handled with care. The need for care is even greater when using it to program the DOM as this is a very complex API.
The use of functional programming in JavaScript is not a new idea, indeed it has many influences from Lisp and Scheme. But it is very good to see someone write a book exploring the topic. The style of the book is very conversational and each chapter moves up through the complex layers of functional programming.
At the beginning the focus is on higher order functions (functions taking in other functions as parameters) all the way to flow based programming and a brief overview of monadic programming. This structure demonstrates very well how functions can be composed together to create bigger programs. Functions written in each chapter re-appear in later ones to be part of a bigger whole.
I have read this book once and I am working my way through it again. It is rich with ideas for any JavaScript programmer. The concepts of functional programming certainly stretched my imperative programmers mind. Stretched as it was, I enjoyed seeing Michael Fogus take an imperative process and re-implement it as a series of functions composed together. Functional JavaScript is a very enjoyable read and I would recommend you pick up a copy.
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