Chapter 1, Why Immutable.js?, explains why you want to use this library.

Chapter 2, Creating Immutable Data, helps you get started by creating immutable collections.

Chapter 3, Persistent Changes, discusses how to create new data by changing existing data.

Chapter 4, Filtering Collections and Finding Items, talks about locating the data that you need.

Chapter 5, Sequences and Side-Effects, explains how to iterate over collections in order to use collection data.

Chapter 6, Sorting Collections, helps you in get the order right.

Chapter 7, Mapping and Reducing, introduces the fundamentals of transforming collection data.

Chapter 8, Zipping and Flattening, discusses simplifying iterations and collection structures.

Chapter 9, Persistent Change Detection, enables you to determine whether a persistent change method actually changed data.

Chapter 10, Working with Sets, explains how to produce unique collection values.

Chapter 11, Comparing Collections, talks about figuring out how one collection relates to another.

Chapter 12, Combining Collections, helps you build new collections by adding collections together.

Chapter 13, Declarative Decision Making, uses immutable collections to help write declarative code.

Chapter 14, Side-Effects in User Interfaces, explains rendering UI components with immutable collections.

Chapter 15, Side-Effects in Node.js, discusses reading and writing collection data using IO streams.

Chapter 16, Immutable Architecture, puts it all together, in the form of a reusable pattern.

You need a computer, Node.js, and a code editor. Instructions for setting up tools to run the code examples can be found at https://github.com/PacktPublishing/Mastering-Immutablejs.

This book is for anyone who wants to improve the reliability and performance of their JavaScript code by leveraging the ideas of immutability. Basic JavaScript knowledge is assumed. You should be able to create arrays and objects, manipulate arrays and objects, and create and call functions.

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: Code words in text are shown as follows: "We can include other contexts through the use of the import statement."

A block of code is set as follows:

#import packages into the project 
from bs4 import BeautifulSoup 
from urllib.request import urlopen 
import pandas as pd

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

import { List } from 'immutable';
const myList = List();
console.log('List', myList instanceof List);
// -> List true

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "In order to download new modules, we will go to Files | Settings | Project Name | Project Interpreter."

Feedback from our readers is always welcome. Let us know what you think about this book—what you liked or disliked. Reader feedback is important for us as it helps us develop titles that you will really get the most out of. To send us general feedback, simply email [email protected], and mention the book's title in the subject of your message. If there is a topic that you have expertise in and you are interested in either writing or contributing to a book, see our author guide at www.packtpub.com/authors.

Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase.