Radio buttons, 208–209

• example, 209f

Rainbow tables, 851, 852f

Range

• input controls, 212f

• specialized control, 211–212

Raster editors, example, 243f

Raster images, 242, 242f

• resizing, 244f

React, 548

• building, 577–582

  • create-react-app, 579–580, 581f

  • other approaches, 582

  • problem of dependencies between JavaScript, 579f

  • tools, 577–579

  • webpack, 579

• components, 553–556

  • class, 556

  • functional, 555–556, 555c

• composing an interface, 554f

• conditional rendering, 565, 566c, 567f

• CSS in, 587

  • using styled components, 587–588c

• data flow, 570, 571f, 573c, 574f

• event handling, 563–565

  • passing data, 564, 565c

  • within class components, 564

• extending, 584–592

  • routing, 584–586

• fetching data, 583–584

  • with useEffect(), 584c

• forms, 568–574

  • component data flow, 570–572, 571, 572f, 574f

  • controlled form components, 568–569, 569c

  • uncontrolled form components, 568, 569–570

• front-end frameworks, 546–548, 549f

  • angular, 548

  • react, 548

  • single-page application (SPA), 548, 549f

  • software framework, 546

  • Vue.js, 548

• hooks, 565, 567f

• introduction, 551–556

• JSX, 552–553

• lifecycle, 582–584

• props, 557–561

  • passing objects, 558–561

  • using, 557f

  • within class components, 560c

• pure function, 558

• Redux, 590–591, 592f

• Router, 584, 585f

  • components specification, 586c

• runtime conversion vs. design-time conversion, 578f

• state, 561–563

  • context provider, 588–589, 591f

  • hooks, 565, 567f

  • other approaches, 588–592

  • Redux, 590–591, 592f

  • within class component, 562f

Real-world server installations, 19–23

Recommendations (W3C production), 75, 107

Records, 721

• authoritative, 893

• CName, 893

• DNS record types, 891–894

• mail exchange (MX), 893

• mapping, 891–893

• name server, 893

• pointer (PTR), 894

• SOA, 893

• SPF records, 893

• TXT records, 893

• validation, 893–894

Red-Green-Blue (RGB), 244–245

• color model, example, 245f

• colors, selection, 245f

Redis

• caching service, 803–804

• use cases, 805f

Reducers, 591

Reduction, vs. enlargement, 253f

Redundancy, 819–820

Reference pixels, 256

Reference types, 364, 365

• vs. primitive types, 365f

REGEXP operator, 568

Regional Internet Registries, 45

Regular expressions, 463–472

• common patterns, 464t

• defined, 463

• extended example, 465–472

• literal, 463

• metacharacters, 463, 463t

• patterns, 464f

• phone number validation script without, 467c

• syntax, 463–465, 919

• web-related, 468t

Relative positioning, 285

• example, 286f

• usage, 289f

Relative referencing, 92

• sample, 97t

Relative units, 128, 130

Remote repository (git), 231–232

Rem units, usage, 169f

Rendering, webpage, 65–67

Repository

• local, 231

• remote, 231–232

Representational State Transfer (REST)

Repudiation, 816

Request

• GET vs. POST, 63f

• header, 61–62

• methods, 62–64

  • DELETE request, 63

  • GET request, 63

  • HEAD request, 63

  • PUT request, 63

Request for Comments (RFC), 8

require_once statement, 625

Response

• codes, 64, 64t

• headers, 62

Responsive design, 123, 124f, 310–321

• components, 310

• patterns, 317–318, 317f

• <picture> element and, 318, 319f

• viewports, setting, 313–314

Responsive layouts

• example, 311f

Rest operator, 391

Result Order, 939–942

Result set, 724

• fetching, 740f

• looping, examples, 739c

• objects, population, 742c–743c

Reverse DNS, 894

• lookups, 53

Reverse index(ing), 938–939

• illustration, 939f

Risk

• assessment and management, 815–817

• impact/probability, example of, 817f

Robots Exclusion Standard, 935

Root configuration file, 907

Root element, 85

Route, 685

Routing, 689

Rows, spanning, 191

• example, 193f

RSA algorithm, 839

Ruby on Rails, 18, 606

Run-length compression, 259

• example, 260f