book

React Interview Guide

Name: React Interview Guide
ISBN: 9781803241517

by Sudheer Jonna, Andrew Baisden

November 2023

Beginner

346 pages

8h 7m

English

Packt Publishing

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React Interview Guide
ContributorsAbout the authorsAbout the reviewers
Preface
Who this book is forWhat this book coversTo get the most out of this bookDownload the example code filesConventions usedGet in touchShare Your ThoughtsDownload a free PDF copy of this book
Part 1: Getting Ready for Interviews
Chapter 1: Bracing Yourself for Interview Preparation
Preparing your resume and cover letterDifferentiating between a resume and a cover letterThe significance of having an excellent resume and cover letterExploring types of resumesKey elements of a good resumeKey elements of a good cover letterExamining job descriptionsIdentifying key skills and accomplishmentsCommon resume mistakes to avoidResearching the companyCommon cover letter mistakes to avoidBuilding your GitHub profile or website portfolioBenefits of building a GitHub profile or website portfolio for finding workHow to make your GitHub profile or website portfolio stand out from the restWhat kind of content you should include in your portfolioExamples of innovative portfolio pieces and how they can help you land a jobPros and cons of using a third-party portfolio building website versus DIYFinding jobs to apply forUnderstanding your career goals and targeting specific job postingsUtilizing job boards to search for relevant opportunitiesNetworking offline and onlineResearching companies and learning about their current job openingsUsing online resources such as Indeed to research salaries and moreUnderstanding the role of meetups and referralsWhat meetups are and why they are important for job seekersTips on how to find the right meetup group for youBenefits of attending meetupsHow to get the most out of a meetupThe importance of referrals in getting a jobTips on how to get referralsExploring interview tipsPreparing for a potential technical interviewResearching the companyPracticing your questions and answersDressing appropriatelyBeing confidentFollowing up after the interviewSummary
Part 2: Mastering the Core React Technical Interview
Chapter 2: Understanding ReactJS Fundamentals and Its Features
Prerequisites to ReactJSIntroduction to ReactJSWhat is React?What are the reasons for choosing React for programming?What are the major features of React?Understanding JSXWhat is JSX?Why can’t browsers understand JSX?What are the advantages of JSX?Building views with elements and componentsWhat are components?What are the different ways to create components?What is the difference between an element and a component?What are pure components?What is a higher-order component?What are fragments and where do you use them?Controlling component data using props and stateWhat are props in React?Can you describe state in React?What are the main differences between props and state?How does React batch multiple state updates?Can you prevent automatic batching?How do you update objects inside the state?How do you update nested state objects?Understanding the importance of key propsWhat is a key prop and what is the purpose of it?Learning about event handlingWhat are synthetic events?How do you differentiate between React event handling and HTML event handling?How do you bind event handlers in class components?Understanding virtual DOMWhat is virtual DOM?How does virtual DOM work?What is Shadow DOM?What is the difference between Real DOM, virtual DOM, and Shadow DOM?What is React Fiber?Data flow and communication in React applicationsCan you describe unidirectional data flow in React?What are the advantages of unidirectional data flow?How do you access DOM?What are refs? How do you create refs?What is the main purpose of refs?How do you compare refs with state?What are forward refs?Managing state globally using the context APIWhat is prop drilling?Can you describe context?What is the purpose of context?Understanding the server-side rendering techniqueWhat is server-side rendering?What is the main difference between server-side rendering and client-side rendering?When do you need to use server-side rendering?Summary
Chapter 3: Hooks: Bring State and Other Features into Function Components
Introduction to Hooks and their purposeWhat are Hooks?What is the motivation behind Hooks?Can you describe the rules of Hook usage?Can I use Hooks inside class components?Local state management using HooksWhat is the useState Hook?Is it always recommended to use an updater function?What is a useReducer Hook? How do you use it?When should you use the useReducer Hook over the useState Hook?Global state management using HooksHow do you override context for a specific part of the component tree?What would the context value be for no matching provider?Performing side effects in React applicationsHow do reactive dependencies impact the logic inside the useEffect Hook?How often are setup and cleanup functions invoked inside the useEffect Hook?When should you remove an object or a function from dependencies?What is the useLayoutEffect Hook? How does it work?Optimizing the application performanceWhat is memoization? How can it be implemented in React?Can you describe the useMemo() Hook?What are the possible use cases of the useMemo() Hook?What are common mistakes with the usage of useMemo? How do you rectify them?When should you use the useCallback Hook instead of the useMemo Hook?Accessing DOM nodes using ref HooksHow do you avoid recreating the Ref contents?Is it possible to access a ref in the render method?How do you expose a subset of methods from a ref instance?Learning about popular third-party HooksWhat is the useImmer Hook? What is its purpose?Building your own HooksWhat are custom Hooks? How do you create them?What are the benefits of custom Hooks?Should you still consider using render props and HOCs?Do you recommend moving effects into custom Hooks?Troubleshooting and debugging HooksHow do you debug custom Hooks?Summary
Chapter 4: Handling Routing and Internationalization
Technical requirementsNavigating screens and an introduction to React RouterWhat is the purpose of the React Router library?How does navigating between screens work in React Router?Routes, types of routes, and linksWhat types of routes can we use?How do you create a route and a link?Adding routesAccessing URL parametersNesting routesDynamic routesError pagesInternationalization and localizationWhat is internationalization?What is localization?Adding translations and formatted messagesWhat are translations?What are formatted messages?Passing arguments and placeholdersHow do we pass arguments?How do we use placeholders?Summary
Chapter 5: Advanced Concepts of ReactJS
Exploring portalsWhat are portals? How do you create them?What are the common use cases of portals?How does event bubbling work inside portals?What accessibility precautions are taken care of in portals?Understanding error boundariesWhat are error boundaries?Is it possible to create an error boundary as a function component?When do error boundaries not work?Managing asynchronous actions with the Suspense APIWhat is the Suspense API? How do you use it?Can I use the suspense component for any kind of data fetching?How do you prevent unnecessary fallbacks during an update?Optimizing rendering performance using concurrent renderingHow do you enable concurrent rendering in React?Debugging React applications with the Profiler APIHow do you measure rendering performance?Strict modeHow do you enable strict mode?Can you describe the list of development-only checks enabled by strict mode?What functions are called twice in the double rendering process of strict mode?Static type checkingWhat are the benefits of static type checking?How do you implement static type checking in React applications?React in mobile environments and its featuresWhat is React Native?What are the differences between React and React Native?Can you describe the React Native architecture based on the threading model?How do you perform navigations in React Native?What are the benefits of the new architecture?What is view flattening?Summary
Part 3: Going Beyond React and Advanced Topics

Chapter 6: Redux: The Best State Management Solution
Understanding the Flux pattern and ReduxWhat is the Flux pattern? Can you explain the data flow?What are the advantages of Flux?How do you differentiate Flux from MVC?What is Redux?What are the differences between Flux and Redux?When do you need to use Redux?Core principles of Redux, components, and APIsWhat are the core principles of Redux?How does Redux work? What are the main components of Redux?Can I use Redux with non-React UI libraries?What are the rules followed by reducers?What is the difference between the mapStateToProps() and mapDispatchToProps() methods?What is a store enhancer?Redux middleware – Saga and ThunkWhat is Redux middleware? How do you create middleware?How do you handle asynchronous tasks in Redux?What are the use cases of Redux Thunk?What is Redux Saga?How do you choose between Redux Saga and Redux Thunk?Standardizing Redux logic using RTKWhat is RTK?What are the problems solved by RTK?What is RTK Query? How do you use it?Debugging applications using Redux DevToolsWhat is Redux DevTools?What are the major features of Redux DevTools?Summary
Chapter 7: Different Approaches to Apply CSS in ReactJS
Technical requirementsDifferent ways to apply CSSHow do we import external style sheets?How do we use inline styles?How do we use Atomic CSS?Exploring processors and CSS ModulesWhat are CSS processors?How do we use CSS processors?What are CSS Modules?How do we use CSS Modules?CSS-in-JS approach and styled-components and its usageWhat is CSS-in-JS?What are styled-components and how are they used in React projects?How to use styled components in React applicationsHow do we use styled components?Summary
Chapter 8: Testing and Debugging the React Application
Technical requirementsIntroducing React testing helpersWhat is testing in software development?How do we do testing in React applications?How do you set up a test environment for a React application?How do you choose a testing framework or library?What are the fundamentals of React Testing Library?Testing our softwareHow do we write tests for components, props, and events?Managing data in our applicationsHow do we mock data for tests?Why should we use mock data in tests?Code execution using events and timersWhat are events?What are timers?Using React DevTools for debugging and analysisSummary
Chapter 9: Rapid Development with Next.js, Gatsby, and Remix Frameworks
Using React as a full stack frameworkWhat is Next.js?What is Gatsby?What is Remix?Static site generationWhy should you care about SSG?What are the advantages of using a static site generator?Why are speed and performance so good in static websites?Server-side renderingWhat is SSR and why is it important?How does SSR work? The fundamentals of SSR page loadingWhat are the advantages of SSR?What are the disadvantages of SSR?Adding page metadataWhat is page metadata and why is it important for SEO?What types of page metadata can be used for SSG?SEO best practicesSummary
Part 4: Hands-On with Programming Tasks
Chapter 10: Cracking Any Real-World Programming Task
Technical requirementsPreparing your development environmentWhy do you need a good development environment?What is the difference between an IDE and a text editor/code editor?How do you set up a React development environment?Choosing the right scaffolding tools or templatesWhat is scaffolding in programming?How do you determine which project factors to take into account when creating a project?Deciding on the application architectureWhat do we need to think about when choosing an application architecture?Testing your codeWhy should you use version control while testing your code?Which testing and change-tracking tools you should utilize for your code base?Creating a Git repository with a README and sharing itWhy is creating a code repository with good documentation crucial?How do you create a Git repository?Summary
Chapter 11: Building an App Based on React, Redux, Styled Components, and the Firebase Backend
Technical requirementsScaffolding and configuring the projectIntroducing Firebase services and configuring the applicationWhat are the main features of Firebase?How do you set up and configure Firebase for authentication and data storage?Where do you put Firebase configuration securely in the project?Implementing Firebase Authentication and its backendHow do you implement Firebase authentication for sign-in, sign-up, and sign-out scenarios?How do you implement cloud store data operations? Can you explain data operations with any collection?Building the Redux components for state managementHow do you work with multiple reducers in a Redux application?Building the presentation layerHow do you implement a custom button using styled-components?Implementing business-specific UI componentsImplementing application pages using UI componentsSupporting internationalizationHow do you achieve internationalization through an imperative API?Implementing testing using the Vitest frameworkCreating a Git repository with README documentationDeploying the application for public accessSummary
Chapter 12: Building an App Based on the Next.js Toolkit, Authentication, SWR, GraphQL, and Deployment
Technical requirementsQuick introduction to REST APIsWhat tools can we use for testing our APIs?Which features are available in a REST API?What is the difference between requests and responses when making requests to a REST API?Why is authentication important when using a REST API?How can we use error handling when integrating with a REST API?What is the difference between a REST API and GraphQL?How do we fetch data using REST APIs and GraphQL?Planning the application architecture including authentication, SWR, GraphQL, and deploymentWhy are serverless frameworks such as Next.js a brilliant choice for building modern applications?What authentication is available in Next.js applications?How does SWR allow fast data retrieval?How can GraphQL integration optimize our data fetching?How do we deploy our Next.js applications online?What strategies can we use for scaling and maintaining our application architecture as it grows?Working on our coffee restaurant projectBuilding the business logicConfiguration files setupBuilding the appBuilding the presentation layerImplementing testingCreating a Git repository with README documentationDeploying the application for public accessSummary
Index
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Content preview from React Interview Guide

3 Hooks: Bring State and Other Features into Function Components

Hooks were introduced in function components to reap the benefits of React features without writing any classes and life cycle methods. Most developers use Redux, Recoil, Mobx, and other third-party libraries to manage the global state in large-scale applications. But when you use React Hooks such as useContext and useReducer together, it becomes a better alternative for external state management. Hooks are much easier to use than complex external libraries that involve excessive amounts of boilerplate code, repetitive files, and folders across the application. React also provides numerous other built-in Hooks that can be useful for various use cases in React applications. If there ...

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React Interview Guide

by Sudheer Jonna, Andrew Baisden

3

Hooks: Bring State and Other Features into Function Components

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