React: Rheinwerk Computing

Sebastian Springer is a JavaScript engineer at MaibornWolff. In addition to developing and designing both client-side and server-side JavaScript applications, he focuses on imparting knowledge. As a lecturer for JavaScript, a speaker at numerous conferences, and an author, he inspires enthusiasm for professional development with JavaScript. Sebastian was previously a team leader at Mayflower GmbH, one of the premier web development agencies in Germany. He was responsible for project and team management, architecture, and customer care for companies such as Nintendo Europe, Siemens, and others.

... Foreword ... 21

... Preface ... 23

... Structure of the Book ... 24

... Download the Code Samples ... 25

... Acknowledgments ... 25

1 ... Getting Started with React ... 27

1.1 ... What Is React? ... 27

1.2 ... Why React? ... 32

1.3 ... The Most Important Terms and Concepts of the React World ... 34

1.4 ... A Look into the React Universe ... 40

1.5 ... Thinking in React ... 41

1.6 ... Code Examples ... 42

1.7 ... Summary ... 43

2 ... The First Steps in the Development Process ... 45

2.1 ... Quick Start ... 45

2.2 ... Playgrounds for React ... 46

2.3 ... Local Development ... 49

2.4 ... Getting Started with Developing in React ... 52

2.5 ... The Structure of the Application ... 66

2.6 ... Troubleshooting in a React Application ... 68

2.7 ... Building the Application ... 71

2.8 ... Summary ... 71

3 ... Basic Principles of React ... 73

3.1 ... Preparation ... 73

3.2 ... Getting Started with the Application ... 74

3.3 ... Function Components ... 78

3.4 ... JSX: Defining Structures in React ... 84

3.5 ... Props: Information Flow in an Application ... 95

3.6 ... Local State ... 100

3.7 ... Event Binding: Responding to User Interactions ... 102

3.8 ... Immutability ... 110

3.9 ... Summary ... 113

4 ... A Look Behind the Scenes: Further Topics ... 115

4.1 ... The Lifecycle of a Component ... 115

4.2 ... The Lifecycle of a Function Component with the Effect Hook ... 116

4.3 ... Server Communication ... 126

4.4 ... Container Components ... 137

4.5 ... Higher-Order Components ... 142

4.6 ... Render Props ... 146

4.7 ... Context ... 150

4.8 ... Fragments ... 158

4.9 ... Summary ... 159

5 ... Class Components ... 161

5.1 ... Class Components in React ... 161

5.2 ... Basic Structure of a Class Component ... 162

5.3 ... Props in a Class Component ... 163

5.4 ... State: The State of the Class Component ... 166

5.5 ... The Component Lifecycle ... 169

5.6 ... Error Boundaries ... 179

5.7 ... Using the Context API in a Class Component ... 183

5.8 ... Differences between Function and Class Components ... 185

5.9 ... Summary ... 186

6 ... The Hooks API of React ... 187

6.1 ... A First Overview ... 188

6.2 ... ¿useReducer¿: The Reducer Hook ... 190

6.3 ... ¿useCallback¿: Memoizing Functions ... 197

6.4 ... ¿useMemö: Memoizing Objects ... 198

6.5 ... ¿useRef¿: References and Immutable Values ... 200

6.6 ... ¿useImperativeHandle¿: Controlling Forward Refs ... 202

6.7 ... ¿useLayoutEffect¿: The Synchronous Alternative to ¿useEffect¿ ... 205

6.8 ... ¿useDebugValue¿: Debugging Information in React Developer Tools ... 206

6.9 ... ¿useDeferredValue¿: Performing Updates According to Priority ... 207

6.10 ... ¿useTransition¿: Lowering the Priority of Operations ... 210

6.11 ... ¿useId¿: Creating Unique Identifiers ... 212

6.12 ... Library Hooks ... 213

6.13 ... Custom Hooks ... 214

6.14 ... Rules of Hooks: Things to Consider ... 215

6.15 ... Changing over to Hooks ... 217

6.16 ... Summary ... 218

7 ... Type Safety in React Applications with TypeScript ... 219

7.1 ... What Is the Benefit of a Type System? ... 219

7.2 ... The Different Type Systems ... 220

7.3 ... Type Safety in a React Application with Flow ... 220

7.4 ... Using TypeScript in a React Application ... 225

7.5 ... TypeScript and React ... 231

7.6 ... Summary ... 242

8 ... Styling React Components ... 245

8.1 ... CSS Import ... 245

8.2 ... Inline Styling ... 253

8.3 ... CSS Modules ... 255

8.4 ... CSS in JavaScript Using Emotion ... 257

8.5 ... Tailwind ... 266

8.6 ... Summary ... 268

9 ... Securing a React Application through Testing ... 271

9.1 ... Getting Started with Jest ... 272

9.2 ... Testing Helper Functions ... 287

9.3 ... Snapshot Testing ... 289

9.4 ... Testing Components ... 294

9.5 ... Dealing with Server Dependencies ... 299

9.6 ... Summary ... 303

10 ... Forms in React ... 305

10.1 ... Uncontrolled Components ... 305

10.2 ... Controlled Components ... 318

10.3 ... File Uploads ... 328

10.4 ... Form Validation Using React Hook Form ... 334

10.5 ... Summary ... 345

11 ... Component Libraries in a React Application ... 347

11.1 ... Installing and Integrating Material UI ... 347

11.2 ... List Display with the ¿Table¿ Component ... 348

11.3 ... Grids and Breakpoints ... 358

11.4 ... Icons ... 361

11.5 ... Deleting Data Records ... 363

11.6 ... Creating New Data Records ... 369

11.7 ... Editing Data Records ... 376

11.8 ... Summary ... 381

12 ... Navigating Within an Application: The Router ... 383

12.1 ... Installation and Integration ... 383

12.2 ... Navigating in the Application ... 385

12.3 ... ¿NotFound¿ Component ... 390

12.4 ... Testing the Routing ... 392

12.5 ... Conditional Redirects ... 396

12.6 ... Dynamic Routes ... 400

12.7 ... Summary ... 406

13 ... Creating Custom React Libraries ... 407

13.1 ... Creating a Custom Component Library ... 407

13.2 ... Integrating the Library ... 415

13.3 ... Testing the Library ... 419

13.4 ... Storybook ... 422

13.5 ... Summary ... 425

14 ... Central State Management Using Redux ... 427

14.1 ... The Flux Architecture ... 427

14.2 ... Installing Redux ... 431

14.3 ... Configuring the Central Store ... 431

14.4 ... Handling Changes to the Store Using Reducers ... 435

14.5 ... Linking Components and the Store ... 438

14.6 ... Describing Changes with Actions ... 444

14.7 ... Creating and Editing Data Records ... 448

14.8 ... Summary ... 453

15 ... Handling Asynchronicity and Side Effects in Redux ... 455

15.1 ... Middleware in Redux ... 455

15.2 ... Redux with Redux Thunk ... 457

15.3 ... Generators: Redux Saga ... 473

15.4 ... State Management Using RxJS: Redux Observable ... 491

15.5 ... JSON Web Token for Authentication ... 498

15.6 ... Summary ... 507

16 ... Server Communication Using GraphQL and the Apollo Client ... 509

16.1 ... Introduction to GraphQL ... 509

16.2 ... Apollo: A GraphQL Client for React ... 514

16.3 ... Apollo Client Devtools ... 526

16.4 ... Local State Management Using Apollo ... 527

16.5 ... Authentication ... 532

16.6 ... Summary ... 534

17 ... Internationalization ... 535

17.1 ... Using react-i18next ... 535

17.2 ... Using Placeholders ... 544

17.3 ... Formatting Values ... 546

17.4 ... Singular and Plural ... 551

17.5 ... Summary ... 553

18 ... Universal React Apps with Server-Side Rendering ... 555

18.1 ... How Does Server-Side Rendering Work? ... 556

18.2 ... Implementing Server-Side Rendering ... 557

18.3 ... Server-Side Rendering Using Next.js ... 569

18.4 ... Summary ... 574

19 ... Performance ... 577

19.1 ... The Callback Hook ... 577

19.2 ... Pure Components ... 580

19.3 ... ¿React.memö ... 581

19.4 ... ¿React.lazy¿: ¿Suspense¿ for Code Splitting ... 584

19.5 ... Suspense for Data Fetching ... 591

19.6 ... Virtual Tables ... 599

19.7 ... Summary ... 603

20 ... Progressive Web Apps ... 605

20.1 ... Features of a Progressive Web App ... 605

20.2 ... Initializing the Application ... 606

20.3 ... Installability ... 606

20.4 ... Offline Capability ... 618

20.5 ... Tools for Development ... 628

20.6 ... Summary ... 629

21 ... Native Apps with React Native ... 631

21.1 ... The Structure of React Native ... 631

21.2 ... Installing React Native ... 631

21.3 ... Displaying an Overview List ... 636

21.4 ... Debugging in the Simulated React Native Environment ... 648

21.5 ... Editing Data Records ... 650

21.6 ... Publishing ... 657

21.7 ... Summary ... 658

... The Author ... 661

... Index ... 663