Book Image

Hands-On Functional Programming with TypeScript

By : Remo H. Jansen

Book Image

Hands-On Functional Programming with TypeScript

By: Remo H. Jansen

Overview of this book

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.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Functional Programming Fundamentals

Functional Programming Fundamentals

Is TypeScript a functional programming language?

The benefits of functional programming

Introducing functional programming

Referential transparency

Stateless versus stateful

Declarative versus imperative programming

Functions as first-class citizens

Lambda expressions

Higher-order functions

Mastering Functions

Mastering Functions

Working with function parameters

Function scope and hoisting

Immediately-invoked functions

Tag functions and tagged templates

Mastering Asynchronous Programming

Mastering Asynchronous Programming

Callbacks and higher-order functions

Asynchronous functions – async and await

The Runtime – The Event Loop and the this Operator

The Runtime – The Event Loop and the this Operator

The environment

Understanding the event loop

The this operator

The Runtime – Closures and Prototypes

The Runtime – Closures and Prototypes

Functional Programming Techniques

Functional Programming Techniques

Composition techniques

Other techniques

Category Theory

Category Theory

Category theory

Immutability, Optics, and Laziness

Immutability, Optics, and Laziness

Functional-Reactive Programming

Functional-Reactive Programming

Reactive programming

Working with observables

Working with operators

Real-World Functional Programming

Real-World Functional Programming

Working with Ramda

Working with Immutable.js

Working with Immer

Working with Funfix

Functional Programming Learning Road Map

Functional Programming Learning Road Map

Advanced beginner

Directory of TypeScript Functional Programming Libraries

Directory of TypeScript Functional Programming Libraries

Functional programming

Category theory

Optics and lenses

Functional-reactive programming

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Other Books You May Enjoy

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Functional Programming Learning Road Map

The following guide can be used to track our level of knowledge regarding functional programming. This guide was developed for the Fantasyland institute of learning for the LambdaConf conference. It was designed for statically-typed functional programming languages that implement category theory.

Languages such as Haskell support category theory natively, but, as we learned previously, we can take advantage of category theory in TypeScript by implementing it or using some third-party libraries. Not all the items in the list are 100% applicable to TypeScript due to language differences, but most of them are 100% applicable.