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Hands-On Functional Programming with TypeScript

By : Jansen

2 (2)

Buy this Book

Hands-On Functional Programming with TypeScript

2 (2)

By: Jansen

Buy this Book

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

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Free Chapter

Functional Programming Fundamentals

Is TypeScript a functional programming language?

The benefits of functional programming

Introducing functional programming

Pure functions

side-effects

Referential transparency

Stateless versus stateful

Declarative versus imperative programming

Immutability

Functions as first-class citizens

Lambda expressions

Function arity

Higher-order functions

Laziness

Summary

Mastering Functions

Function types

Working with function parameters

Function scope and hoisting

Immediately-invoked functions

Tag functions and tagged templates

Summary

Mastering Asynchronous Programming

Callbacks and higher-order functions

Callback hell

Generators

Asynchronous functions – async and await

Summary

The Runtime – The Event Loop and the this Operator

The environment

Understanding the event loop

The this operator

Summary

The Runtime – Closures and Prototypes

Prototypes

Closures

Summary

Functional Programming Techniques

Composition techniques

Other techniques

Summary

Category Theory

Category theory

Functors

Summary

Immutability, Optics, and Laziness

Immutability

Optics

Laziness

Summary

Functional-Reactive Programming

Reactive programming

Working with observables

Working with operators

Summary

Real-World Functional Programming

Working with Ramda

Working with Immutable.js

Working with Immer

Working with Funfix

Summary

Functional Programming Learning Road Map

Beginner

Advanced beginner

Intermediate

Proficient

Expert

Summary

Directory of TypeScript Functional Programming Libraries

Functional programming

Category theory

Laziness

Immutability

Optics and lenses

Functional-reactive programming

Others

Summary

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The this operator

In JavaScript, the this operator behaves a little differently compared to other languages. The value of the this operator is often determined by the way a function is invoked. Its value cannot be set by assignment during execution, and it may be different each time a function is invoked.

The this operator also has some differences when using strict and non-strict modes. ECMAScript 5's strict mode is a way to opt into a restricted variant of JavaScript. You can learn more about strict mode at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode.