Download or read book Functional React 2nd Edition written by Cristian Salcescu and published by . This book was released on 2020-06 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you want to learn how to build modern React applications using functional components and functional programming principles, this is the book for you. React allows expressing the UI using functions. React Hooks enables stateful functional components. Here are some of the things you will learn: The core functional programming concepts with JavaScript How to create components using only functions Presentations and container components patterns How to use the state and effect core hooks How to create and reuse a custom hook Discover both Redux and MobX as state management solutions How to handle side-effects with both Redux Thunk and Redux Observable Using the React Router to enable routing in single-page applications How to structure React applications Programming in a functional style means to use concepts such as pure functions, immutability, closures, higher-order functions, or currying.

Download or read book Learning React written by Alex Banks and published by "O'Reilly Media, Inc.". This book was released on 2020-06-12 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you want to learn how to build efficient React applications, this is your book. Ideal for web developers and software engineers who understand how JavaScript, CSS, and HTML work in the browser, this updated edition provides best practices and patterns for writing modern React code. No prior knowledge of React or functional JavaScript is necessary. With their learning road map, authors Alex Banks and Eve Porcello show you how to create UIs that can deftly display changes without page reloads on large-scale, data-driven websites. You’ll also discover how to work with functional programming and the latest ECMAScript features. Once you learn how to build React components with this hands-on guide, you’ll understand just how useful React can be in your organization. Understand key functional programming concepts with JavaScriptLook under the hood to learn how React runs in the browserCreate application presentation layers with React componentsManage data and reduce the time you spend debugging applicationsIncorporate React Hooks to manage state and fetch dataUse a routing solution for single-page application featuresLearn how to structure React applications with servers in mind

Download or read book Learning React written by Alex Banks and published by "O'Reilly Media, Inc.". This book was released on 2017-04-27 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you want to learn how to build efficient user interfaces with React, this is your book. Authors Alex Banks and Eve Porcello show you how to create UIs with this small JavaScript library that can deftly display data changes on large-scale, data-driven websites without page reloads. Along the way, you’ll learn how to work with functional programming and the latest ECMAScript features. Developed by Facebook, and used by companies including Netflix, Walmart, and The New York Times for large parts of their web interfaces, React is quickly growing in use. By learning how to build React components with this hands-on guide, you’ll fully understand how useful React can be in your organization. Learn key functional programming concepts with JavaScript Peek under the hood to understand how React runs in the browser Create application presentation layers by mounting and composing React components Use component trees to manage data and reduce the time you spend debugging applications Explore React’s component lifecycle and use it to load data and improve UI performance Use a routing solution for browser history, bookmarks, and other features of single-page applications Learn how to structure React applications with servers in mind

Download or read book React Quickly Second Edition written by Morten Barklund and published by Simon and Schuster. This book was released on 2024-01-02 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn the skills you need to build React applications quickly! This fully revised second edition introduces JSX, functional components, React hooks, event and form handling, and more. In React Quickly, Second Edition you will learn how to: Master React fundamentals Implement best practices and the components of good architecture Build intuitive user interfaces Create dynamic components with JSX Use lightweight functional components in React Make your app interactive with stateful components Utilize React hooks Handle events like button clicks and pass data between components Build your skills with React fast! There’s no slow theory and tedious history in React Quickly—you’ll dive into React code right from the very first chapter. As you go, you’ll explore over 80 useful and practical examples that put React into action. This new second edition has been completely rewritten to cover the latest developments in the React framework. Perfect, whether you’re a React beginner or an experienced pro looking to keep their skills up to date. About the technology React makes it a breeze to build beautiful, reliable web frontends. This amazing JavaScript library has a modular architecture, so you can create, combine, and test components seamlessly. React is perfect for small prototypes, enterprise scale sites, and everything in between. About the book React Quickly, Second Edition offers a unique approach to learning the React framework. More than 80 concise examples guide you from your first steps through advanced applications. You’ll appreciate the up-to-date coverage of functional components, React hooks, and web accessibility, along with interesting projects to practice your new skill. What's inside Master React fundamentals Best practices of component-based design Create dynamic components with JSX Make your app interactive with stateful components About the reader For developers comfortable building web applications with JavaScript. About the author Morten Barklund is an expert in React, web testing, and accessibility and is the founder of Coding Heaven. Azat Mardan is a seasoned software engineer, startup mentor, and best-selling author. Table of Contents 1 Meeting React 2 Baby steps with React 3 Introduction to JSX 4 Functional Components 5 Making React interactive with states 6 Effects and the React component life cycle 7 Hooks to fuel your web applications 8 Handling events in React 9 Working with forms in React 10 Advanced React hooks for scaling 11 Project: Website menu 12 Project: Timer 13 Project: Task manager

Download or read book Functional React written by Cristian Salcescu and published by Independently Published. This book was released on 2023-05-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you want to learn how to build React applications using function components and functional programming principles this is the book for you. Here are some of the things you will learn: The core functional programming concepts with JavaScript How to create components using only functions Presentations and container components patterns How to use the state and effect core hooks How to create and reuse a custom hook Discover the Redux state management solution How to handle side-effects with Redux Thunk How to use the React Router to enable routing in single-page applications

Download or read book Functional React written by Cristian Salcescu and published by . This book was released on 2019-06-09 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: React is one of the most popular JavaScript libraries for creating user interfaces. React embraces functional programming. Programming in a functional style means to use concepts such as pure functions, immutability, closures, higher-order components, partial application or currying. The basic unit in React is the component. React makes it easy to build components with functions. Components become mapping functions that transform data into a user interface. A higher-order component is a function that transforms a component into another component. React Hooks enables function components to store state. Redux does state management using functional principles. Reducers, selectors, action creators are pure functions. MobX makes state observable and turns components into observers.

Download or read book React Quickly Second Edition written by Morten Barklund and published by Simon and Schuster. This book was released on 2023-09-05 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn the skills you need to build React applications quickly! This fully revised second edition introduces functional components, React hooks, static site generators, and more. In React Quickly, Second Edition you will learn how to: Master React fundamentals Implement best practices and the components of good architecture Build intuitive user interfaces Create dynamic components with JSX Use lightweight functional components in React Make your app interactive with stateful components Utilize React hooks Handle events like button clicks and pass data between components Build your skills with React fast! There’s no slow theory and tedious history in React Quickly—you’ll dive into React code right from the very first chapter. As you go, you’ll explore over 80 useful and practical examples that put React into action. This new second edition has been completely rewritten to cover the latest developments in the React framework. Perfect, whether you’re a React beginner or an experienced pro looking to keep their skills up to date. Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. About the technology React makes it a breeze to build beautiful, reliable web frontends. This amazing JavaScript library has a modular architecture, so you can create, combine, and test components seamlessly. React is perfect for small prototypes, enterprise scale sites, and everything in between. About the book React Quickly, Second Edition offers a unique approach to learning the React framework. More than 80 concise examples guide you from your first steps through advanced applications. You’ll appreciate the up-to-date coverage of functional components, React hooks, and web accessibility, along with interesting projects to practice your new skill. What's inside Master React fundamentals Best practices of component-based design Create dynamic components with JSX Make your app interactive with stateful components About the reader For developers comfortable building web applications with JavaScript. About the author Morten Barklund is an expert in React, web testing, and accessibility and is the founder of Coding Heaven. Azat Mardan is a seasoned software engineer, startup mentor, and best-selling author. Table of Contents 1 Meeting React 2 Baby steps with React 3 Introduction to JSX 4 Functional Components 5 Making React interactive with states 6 Effects and the React component life cycle 7 Hooks to fuel your web applications 8 Handling events in React 9 Working with forms in React 10 Advanced React hooks for scaling 11 Project: Website menu 12 Project: Timer 13 Project: Task manager

Download or read book Mastering JavaScript Functional Programming written by Federico Kereki and published by Packt Publishing Ltd. This book was released on 2020-01-24 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explore the functional programming paradigm and the different techniques for developing better algorithms, writing more concise code, and performing seamless testing Key FeaturesExplore this second edition updated to cover features like async functions and transducers, as well as functional reactive programmingEnhance your functional programming (FP) skills to build web and server apps using JavaScriptUse FP to enhance the modularity, reusability, and performance of appsBook Description Functional programming is a paradigm for developing software with better performance. It helps you write concise and testable code. To help you take your programming skills to the next level, this comprehensive book will assist you in harnessing the capabilities of functional programming with JavaScript and writing highly maintainable and testable web and server apps using functional JavaScript. This second edition is updated and improved to cover features such as transducers, lenses, prisms and various other concepts to help you write efficient programs. By focusing on functional programming, you’ll not only start to write but also to test pure functions, and reduce side effects. The book also specifically allows you to discover techniques for simplifying code and applying recursion for loopless coding. Gradually, you’ll understand how to achieve immutability, implement design patterns, and work with data types for your application, before going on to learn functional reactive programming to handle complex events in your app. Finally, the book will take you through the design patterns that are relevant to functional programming. By the end of this book, you’ll have developed your JavaScript skills and have gained knowledge of the essential functional programming techniques to program effectively. What you will learnSimplify JavaScript coding using function composition, pipelining, chaining, and transducingUse declarative coding as opposed to imperative coding to write clean JavaScript codeCreate more reliable code with closures and immutable dataApply practical solutions to complex programming problems using recursionImprove your functional code using data types, type checking, and immutabilityUnderstand advanced functional programming concepts such as lenses and prisms for data accessWho this book is for This book is for JavaScript developers who want to enhance their programming skills and build efficient web applications. Frontend and backend developers who use various JavaScript frameworks and libraries like React, Angular, or Node.js will also find the book helpful. Working knowledge of ES2019 is required to grasp the concepts covered in the book easily.

Download or read book Learning React 2nd Edition written by Eve Porcello and published by . This book was released on 2019 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you want to learn how to build efficient React applications, this is your book. Ideal for web developers and software engineers who understand how JavaScript, CSS, and HTML work in the browser, this updated edition provides best practices and patterns for writing modern React code. No prior knowledge of React or functional programming is necessary. Authors Alex Banks and Eve Porcello show you how to create UIs that can deftly display changes without page reloads on large-scale data-driven websites. You'll also discover how to work with functional programming and the latest ECMAScript features. Once you learn how to build React components with this hands-on guide, you'll understand just how useful React can be in your organization. Understand key functional programming concepts with JavaScript Look under the hood to learn how React runs in the browser Create application presentation layers with React components Manage data and reduce the time you spend debugging applications Explore React's component lifecycle to improve UI performance Use a routing solution for single-page application features Learn how to structure React applications with servers in mind.

Download or read book Learning React Native written by Bonnie Eisenman and published by "O'Reilly Media, Inc.". This book was released on 2017-10-23 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Get a practical introduction to React Native, the JavaScript framework for writing and deploying fully featured mobile apps that render natively. The second edition of this hands-on guide shows you how to build applications that target iOS, Android, and other mobile platforms instead of browsers—apps that can access platform features such as the camera, user location, and local storage. Through code examples and step-by-step instructions, web developers and frontend engineers familiar with React will learn how to build and style interfaces, use mobile components, and debug and deploy apps. You’ll learn how to extend React Native using third-party libraries or your own Java and Objective-C libraries. Understand how React Native works under the hood with native UI components Examine how React Native’s mobile-based components compare to basic HTML elements Create and style your own React Native components and applications Take advantage of platform-specific APIs, as well as modules from the framework’s community Incorporate platform-specific components into cross-platform apps Learn common pitfalls of React Native development, and tools for dealing with them Combine a large application’s many screens into a cohesive UX Handle state management in a large app with the Redux library

Download or read book React Quickly written by Azat Mardan and published by Simon and Schuster. This book was released on 2017-08-20 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary React Quickly is for anyone who wants to learn React.js fast. This hands-on book teaches you the concepts you need with lots of examples, tutorials, and a large main project that gets built throughout the book. Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. About the Technology Successful user interfaces need to be visually interesting, fast, and flowing. The React.js JavaScript library supercharges view-heavy web applications by improving data flow between UI components. React sites update visual elements efficiently and smoothly, minimizing page reloads. React is developer friendly, with a strong ecosystem to support the dev process along the full application stack. And because it's all JavaScript, React is instantly familiar. About the Book React Quickly is the tutorial for web developers who want to get started fast with React.js. Following carefully chosen and clearly explained examples, you'll learn React development using your existing JavaScript and web dev skills. You'll explore a host of different projects as you learn about web components, forms, and data. What's Inside Master React fundamentals Build full web apps with data and routing Test components Optimize React apps About the Reader This book is for developers comfortable building web applications with JavaScript. About the Author Azat Mardan is a Tech Fellow at Capital One with extensive experience using and teaching JavaScript and Node, and author of several books on JavaScript, Node, React, and Express. Table of Contens PART 1 - REACT FOUNDATION Meeting React Baby steps with React Introduction to JSX Making React interactive with states React component lifecycle events Handling events in React Working with forms in React Scaling React components Project: Menu component Project: Tooltip component Project: Timer component PART 2 - REACT ARCHITECTURE The Webpack build tool React routing Working with data using Redux Working with data using GraphQL Unit testing React with Jest React on Node and Universal JavaScript Project: Building a bookstore with React Router Project: Checking passwords with Jest Project: Implementing autocomplete with Jest, Express, and MongoDB APPENDIXES Appendix A - Installing applications used in this book Appendix B - React cheatsheet Appendix C - Express.js cheatsheet Appendix D - MongoDB and Mongoose cheatsheet Appendix E - ES6 for success

Download or read book ASP NET Core 5 and React written by Carl Rippon and published by Packt Publishing Ltd. This book was released on 2021-01-08 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Build fully functional, cloud-ready, and professional web applications using the latest features in the .NET 5 framework and React.js with Microsoft Azure Key FeaturesExplore the new features of .NET 5 with this updated edition of ASP.NET Core 5 and ReactDiscover strategies for adopting a full-stack development approach, clean architecture techniques, and development best practicesLearn how to manage data, design and package applications, and secure your web appsBook Description Microsoft’s .NET framework is a robust server-side framework, now even more powerful thanks to the recent unification of the Microsoft ecosystem with the .NET 5 framework. This updated second edition addresses these changes in the .NET framework and the latest release of React. The book starts by taking you through React and TypeScript components for building an intuitive single-page application and then shows you how to design scalable REST APIs that can integrate with a React-based frontend. Next, you’ll get to grips with the latest features, popular patterns, and tools available in the React ecosystem, including function-based components, React Router, and Redux. As you progress through the chapters, you'll learn how to use React with TypeScript to make the frontend robust and maintainable and cover key ASP.NET 5 features such as API controllers, attribute routing, and model binding to build a sturdy backend. In addition to this, you’ll explore API security with ASP.NET 5 identity and authorization policies and write reliable unit tests using both .NET and React, before deploying your app on Azure. By the end of this book, you’ll have gained the knowledge you need to enhance your C# and JavaScript skills and build full-stack, production-ready applications with ASP.NET 5 and React. What you will learnBuild RESTful APIs with .NET 5 using API controllersSecure REST APIs with identity and authorization policiesCreate strongly typed, interactive, and function-based React components using HooksUnderstand how to style React components using Emotion.jsPerform client-side state management with ReduxRun a range of automated tests on the frontend and backendImplement continuous integration and continuous delivery (CI/CD) processes in Azure using Azure DevOpsWho this book is for If you're a web developer looking to get up to speed with full-stack web application development with .NET Core and React, this book is for you. Although the book does not assume any knowledge of React, a basic understanding of .NET Core will help you to get to grips with the concepts covered.

Download or read book React Native for Mobile Development written by Akshat Paul and published by Apress. This book was released on 2019-06-12 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Develop native iOS and Android apps with ease using React Native. Learn by doing through an example-driven approach, and have a substantial running app at the end of each chapter. This second edition is fully updated to include ES7 (ECMAScript 7), the latest version of React Native (including Redux), and development on Android. You will start by setting up React Native and exploring the anatomy of React Native apps. You'll then move on to Redux data flow, how it differs from flux, and how you can include it in your React Native project to solve state management differently and efficiently. You will also learn how to boost your development by including popular packages developed by the React Native community that will help you write less; do more. Finally, you'll learn to how write test cases using Jest and submit your application to the App Store. React Native challenges the status quo of native iOS and Android development with revolutionary components, asynchronous execution, unique methods for touch handling, and much more. This book reveals the the path-breaking concepts of React.js and acquaints you with the React way of thinking so you can learn to create stunning user interfaces. What You'll Learn Build stunning iOS and Android applications Understand the Redux design pattern and use it in your project Interact with iOS and android device capabilities such as addressbook, camera, GPS and more with your apps Test and launch your application to the App StoreWho This Book Is For Anyone with JavaScript experience who wants to build native mobile applications but dreads the thought of programming in Objective-C or Java. Developers who have experience with JavaScript but are new or not acquainted to React Native or ReactJS.

Download or read book Functional Architecture with React and Redux written by Cristian Salcescu and published by . This book was released on 2020-02 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: If you want to learn React and Redux by example this is a book you would like. We are going to build several applications with an incremental level of complexity by going through the same steps. The unidirectional flow implies getting the initial state, showing it to the user using the view functions, listening for actions, updating the state based on those actions, and rendering the updated state back to the user again. In all application we will identify these concepts: The state - the data that is stored and can change. The views - functions transform the data into HTML. React makes it easier to create view functions that take input data and - return the visual representation of it using an XML-like syntax called JSX. Actions - plain data objects used to express user interaction. The updaters - functions transform the state. They receive the current state and an action and return the new state. The Redux library provides a functional approach for managing state using pure update functions. From simple to complex, we are going to build: The Counter app A Sidebar The Color Search app The Loan Calculator app The Toast Notification module The Weather Forecast app The Hacker News Client A Show More component The NYT Client A Fetch module The book takes the approach of repetition as the key to learning.

Download or read book React and React Native written by Adam Boduch and published by Packt Publishing Ltd. This book was released on 2017-03-08 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use React and React Native to build applications for desktop browsers, mobile browsers, and even as native mobile apps About This Book Build React and React Native applications using familiar component concepts Dive deep into each platform, from routing in React to creating native mobile applications that can run offline Use Facebook's Relay, React and GraphQL technologies, to create a unified architecture that powers both web and native applications Who This Book Is For This book is written for any JavaScript developer—beginner or expert—who wants to start learning how to put both of Facebook's UI libraries to work. No knowledge of React is needed, though a working knowledge of ES2015 will help you follow along better. What You Will Learn Craft reusable React components Control navigation using the React Router to help keep your UI in sync with URLs Build isomorphic web applications using Node.js Use the Flexbox layout model to create responsive mobile designs Leverage the native APIs of Android and iOS to build engaging applications with React Native Respond to gestures in a way that's intuitive for the user Use Relay to build a unified data architecture for your React UIs In Detail React and React Native allow you to build cross-platform desktop and mobile applications using Facebook's innovative UI libraries. Combined with the Flux data architecture and Relay, you can now create powerful and feature-complete applications from just one code base! This book is split into three parts. The first part shows you how to start crafting composable UIs using React, from rendering with JSX and creating reusable components through to routing and creating isomorphic applications that run on Node. We then move on to showing you how to take the concepts of React and apply them to building Native UIs using React Native. You'll find out how to build responsive and streamlined UIs that can properly handle user interactions in a mobile environment. You'll also learn how to access device-specific APIs such as the geolocation API, and how to handle offline development with React Native. Finally, we'll tie all of these skills together and shows you how you can create React applications that run on every major platform. As well as understanding application state in depth, you'll learn how to leverage Relay to make feature-complete, data-driven web and native mobile applications. Style and approach Split into three major sections to help organize your learning, this hands-on, code-first book will help you get up to speed with React and React Native—the UI framework that powers Netflix, Yahoo, and Facebook.

Download or read book Full Stack React Projects written by Shama Hoque and published by Packt Publishing Ltd. This book was released on 2020-04-17 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical, project-based guide to full-stack JavaScript web development combining the power of React with industry-tested server-side technologies Key Features Build your career as a full-stack developer with this practical guide Understand how the different aspects of a MERN application come together through a series of practical projects Master the MERN stack by building robust social media, E-commerce store, and web-based VR game apps Book DescriptionFacebook's React combined with industry-tested, server-side technologies, such as Node, Express, and MongoDB, enables you to develop and deploy robust real-world full-stack web apps. This updated second edition focuses on the latest versions and conventions of the technologies in this stack, along with their new features such as Hooks in React and async/await in JavaScript. The book also explores advanced topics such as implementing real-time bidding, a web-based classroom app, and data visualization in an expense tracking app. Full-Stack React Projects will take you through the process of preparing the development environment for MERN stack-based web development, creating a basic skeleton app, and extending it to build six different web apps. You’ll build apps for social media, classrooms, media streaming, online marketplaces with real-time bidding, and web-based games with virtual reality features. Throughout the book, you’ll learn how MERN stack web development works, extend its capabilities for complex features, and gain actionable insights into creating MERN-based apps, along with exploring industry best practices to meet the ever-increasing demands of the real world. By the end of this React book, you’ll be able to build production-ready MERN full-stack apps using advanced tools and techniques in modern web development.What you will learn Extend a basic MERN-based application to build a variety of applications Add real-time communication capabilities with Socket.IO Implement data visualization features for React applications using Victory Develop media streaming applications using MongoDB GridFS Improve SEO for your MERN apps by implementing server-side rendering with data Implement user authentication and authorization using JSON web tokens Set up and use React 360 to develop user interfaces with VR capabilities Make your MERN stack applications reliable and scalable with industry best practices Who this book is for This is one of the most useful web development books for JavaScript developers who may have worked with React but have minimal experience in full-stack development with Node, Express, and MongoDB.

Download or read book Learn React Hooks written by Daniel Bugl and published by Packt Publishing Ltd. This book was released on 2019-10-18 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: Create large-scale web applications with code that is extensible and easy to understand using React Hooks Key FeaturesExplore effective strategies for migrating your state management from Redux and MobX to React HooksIntegrate Hooks with React features such as Context and Suspense to add advanced functionality to your web appsCreate complex applications by combining multiple hooksBook Description React Hooks revolutionize how you manage state and effects in your web applications. They enable you to build simple and concise React.js applications, along with helping you avoid using wrapper components in your applications, making it easy to refactor code. This React book starts by introducing you to React Hooks. You will then get to grips with building a complex UI in React while keeping the code simple and extensible. Next, you will quickly move on to building your first applications with React Hooks. In the next few chapters, the book delves into various Hooks, including the State and Effect Hooks. After covering State Hooks and understanding how to use them, you will focus on the capabilities of Effect Hooks for adding advanced functionality to React apps. You will later explore the Suspense and Context APIs and how they can be used with Hooks. Toward the concluding chapters, you will learn how to integrate Redux and MobX with React Hooks. Finally, the book will help you develop the skill of migrating your existing React class components, and Redux and MobX web applications to Hooks. By the end of this book, you will be well-versed in building your own custom Hooks and effectively refactoring your React applications. What you will learnUnderstand the fundamentals of React Hooks and how they modernize state management in React appsBuild your own custom Hooks and learn how to test themUse community Hooks for implementing responsive design and moreLearn the limitations of Hooks and what you should and shouldn’t use them forGet to grips with implementing React context using HooksRefactor your React-based web application, replacing existing React class components with HooksUse state management solutions such as Redux and MobX with React HooksWho this book is for This book is for React developers who want to learn how to build applications with Hooks. Developers who are looking to migrate to React for its advanced feature set and capabilities will also find the book useful.