Overall, there's some good content in this book, but not enough of it that I feel satisfied with my purchase.
Structurally it ends up being a hodgepodge of information, most of which isn't focused upon the central thrust of the book, Functional Programming in Typescript.
The first half of the book is focused primarily upon JavaScript fundamentals regarding functions themselves, with some Typescript information thrown in. However most of the Typescript content is in the form of what additions you need to make to your tsconfig file. Beyond that there is little direct discussion of typescript. The examples are in typescript, but the author doesn't actually talk about approaches to typing.
If you aren't already familiar with these topics, like Promises, the Event Loop, this, arrow functions, etc, the information will prove useful. But if you are, then feel free to skip the first half of the book you just paid for.
Recursion gets a paragraph and the fibonnaci algorithm, while point free style has a vague explanation then a code example with and without a point free approach, leaving you to deduce what exactly the author meant.
The category theory section was actually quite helpful for me, as it did a lot to clarify what Functors, Applicatives and Monads actually are without relying upon mathematic terminology.
The Lense section was similarly clarifying.
However then the author decides to delve into Functional Reactive programming and we spend a chapter learning about RxJs. Interesting, and helpful, if I wanted to learn about RxJs. If I did, I would get a book on it, and not just a chapter in a book on a different topic...
Finally we get to the Real World Functional Programming chapter, which is nothing more than a brief overview of a couple functional programming libraries. We don't even talk about fp-ts, a functional programming library FOR typescript!
Overall the book suffers from a disorganized focus upon everything but the two reasons I bought the book to begin with: functional programming & Typescript. All of the examples are in Typescript, but there's little actual coverage of how to type functional style programs, which can actually be quite difficult. It has a lot of different topics that it covers, presumably building up the fundamental knowledge that you need, but then falls completely flat.
The author routinely treats the provided code as self-explanatory, and some times it is. However providing a single example and then moving on to a new topic is really inadequate. I was hoping for some solid functional code with a walk-through of the build up process is, figuring out what helper functions you'll need to define, dealing with IO, and thinking functionally, and instead I got a really terse book that spends more pages talking about function parameters than it does talking about ADT.
One of the main reasons I purchased this book is because the author's blog post advocating using Typescript for Functional Programming. I assumed the book would be similarly well written. Given the formulaic nature of the book, I believe this is less of a reflection on the author than it is on Packt as a publisher and their formatting/content requirements.
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