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Mastering Functions

In Chapter 1, Functional Programming Fundamentals, we learned about some of the most fundamental functional programming concepts. Functions are one of the fundamental building blocks of any TypeScript application, and they are powerful enough to warrant an entire chapter being dedicated to them in order to explore their potential.

In this chapter, we are going to master the usage of functions. The chapter starts with a quick recap of a number of basic concepts and then moves on to some less commonly known function features and use cases:

Function types:
- Function declarations and function expressions
- Named and anonymous functions
Working with parameters:
- Functions with optional parameters
- Functions with default parameters
- Functions with rest parameters
- Function overloading
- Specialized overloading signature
Function scope
Immediately-invoked functions

Key benefits

Get a solid understanding of how to apply functional programming concepts in TypeScript

Explore TypeScript runtime features such as event loop, closures, and Prototypes

Gain deeper knowledge on the pros and cons of TypeScript

Description

Functional programming is a powerful programming paradigm that can help you to write better code. However, learning functional programming can be complicated, and the existing literature is often too complex for beginners. This book is an approachable introduction to functional programming and reactive programming with TypeScript for readers without previous experience in functional programming with JavaScript, TypeScript , or any other programming language. The book will help you understand the pros, cons, and core principles of functional programming in TypeScript. It will explain higher order functions, referential transparency, functional composition, and monads with the help of effective code examples. Using TypeScript as a functional programming language, you’ll also be able to brush up on your knowledge of applying functional programming techniques, including currying, laziness, and immutability, to real-world scenarios. By the end of this book, you will be confident when it comes to using core functional and reactive programming techniques to help you build effective applications with TypeScript.

What you will learn

Understand the pros and cons of functional programming

Delve into the principles, patterns, and best practices of functional and reactive programming

Use lazy evaluation to improve the performance of applications

Explore functional optics with Ramda

Gain insights into category theory functional data structures such as Functors and Monads

Use functions as values, so that they can be passed as arguments to other functions

What do you get with Print?

Instant access to your digital copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Redeem a companion digital copy on all Print orders

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Hands-On Functional Programming with TypeScript

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NotMyRealName Jun 30, 2019

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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Eric H Nov 29, 2022

This books covers the basics of functional programming, so if you don't know what a Functor or Monad is - this book could be helpful.If you have any background with FP, have coded in Scala or Haskell or are looking for practical uses of FP in real world scenarios - this books provides nothing.

Hands-On Functional Programming with TypeScript: Explore functional and reactive programming to create robust and testable TypeScript applications

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Hands-On Functional Programming with TypeScript

Mastering Functions

Function types

Working with function parameters

Trailing commas in function arguments

Function scope and hoisting

Immediately-invoked functions

Tag functions and tagged templates

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