J, K, L. Node.js require() method, 403 package.json, 401 streams functionality, 401 task() method, 401 use strict statement, 403

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1 Index A Abstract factory pattern, Adapter pattern, Apply and call methods, Architectural patterns MVC (see Model-View-Controller (MVC)) MVP (see Model-View-Presenter (MVP) pattern) MVVM (see Model-View-ViewModel (MVVM) pattern) Arrays creation, 110 functions within loops, 112 looping, B Behavioral design patterns chain of responsibility, command, description, 163 interator, mediator, memento, observer, promises, strategy, Browser developer tools DOM, 424 Internet Explorer and Chrome, 423 JavaScript (see JavaScript) Mozilla s Firefox browser, 423 Safari browser, 424 Build automation and tools benchmark, 391 bower.json, 419 code quality, 391 development workflow, 391 dynamic web page, 404 front-end package manager, 419 grunt-bowercopy, 420 Gruntfile.js, 406 Gulp.js, , 406, 408 index.html page, 406 JavaScript task runner (see JavaScript task runner, grants) Node.js application platform, 392 NPM directory, 419 production-ready code (see Production-ready code) repetitive tasks, 404 scaffolding, task runner, 391 time-consuming, 404 web applications, 404, 420 web server, 404 Builder pattern, C Canvas API basic drawing operations, , 264 building Frogger game (see Frogger game, Canvas API) building games animation, 267 collision detection, drawimage() method, game control, layering canvases, 272 procedures and structures, 265 sprite map, drawing individual image, 266 game loop at fixed frame rate, setinterval() function, 270 requestanimationframe, 271 high-definition (retina) graphics, 264 three-dimensional graphics, 261 two-dimensional drawing context,

2 index Chain of responsibility pattern, Client-side templates array item, 357 conditional sections, 349 custom helpers, DOM, 341 EJS, Handlebars.js, HTML, if helper, 357 Inverted sections, Iterator sections, 349 JavaScript data, 342 library, log Helper, 358 Mustache.js, , 348 partial templates, precompiling templates, 360, registerpartial() method, 356 text string, 343 Underscore.js, variables, 348 CLI tool (see Command line interface (CLI) tool) Code file dependencies management aliases, 230 BBC, 229 content delivery networks and fallbacks, 230 modules, modules creation, RequireJS alternatives, 235 code optimizer tool, 234CSS style rules, 224, 226 definition, 223 folder structure, 228 homepage, 227 HTML code, 224 library, 223 newsletter sign-up form, 226 plugins, 234 scripts loading, Code quality measurement code coverage, 83 complex code, 86 Grunt command line interface, 84 Gruntfile.js, 85 Istanbul, 84 LCOV, Mac and Linux users, 87 metrics, 87 NPM, 84 Plato tool, 86, 88 running tools, 83 Coding conventions and naming camel-case, word divisions, 25 description, 23 descriptive names, 24 function block, 26 lowercase letter, uppercase characters, 25 variable and function name hoisting code blocks and scope, hoisting of functions, 28 variables, 27 Command line interface (CLI) tool, 393 Command pattern, Composite pattern, Content delivery networks (CDN), 230 Context and this keyword constructor function initializing properties, 10 literal object input, this keyword within, 8 dot notation, 7 efficient constructor, 9 storing value into variable, 7 Creational design patterns abstract factory, builder, description, 119 factory, prototype, singleton, , 135 D Debugging running, JavaScript breakpoint, 430 Chrome developer tools, 429 conditional statements, 431 console object, 430 continue button, 431 Firefox developer tools, 429 Internet Explorer developer tools, 430 JSON-format, 429 left-hand panel, 431 local variables, 432 pretty printing, Safari developer tools, 429 source maps, 429 unminified code, 428 web server, 428 Decorator pattern, Documentation inline and block comments, 37 Markdown (see Markdown) structured, 38 website creation, YUIDoc classes and modules, 62 documented code uses, 58 HTML site, documented JavaScript code,

3 Index JavaScript application, 58 JSON-formatted file, 58 node, 58 NPM, 58 packages, 58 YUIDoc format (see YUIDoc documentation format) Document Object Model (DOM), 341 DOM. See Document Object Model (DOM) E ECMAScript 5 array methods description, 31 Each method, 31 every and some methods, 32 filter method, 33 map method, 32 function binding, 30 JSON Data Format Parsing, 28 object methods description, 33 object create method, object freeze method, 34 Object getownpropertydescriptor method, 34 object keys method, 35 property definitions, strict mode, EJS. See Embedded JavaScript (EJS) Embedded JavaScript (EJS) JavaScript templating language, 364 Mustache.js and Handlebars.js, 365 render() method, 365 Ruby language developers, 364 update() method, 366 Encapsulation, 14 F Façade pattern, Factory pattern, Flyweight pattern, , Frogger game, Canvas API arcade classic, 273 core game logic, HTML page, 273 namespace, key properties and methods, purpose, 272 G Gulp.js gulpfile.js., 401 gulp-jshint, 401 Node.js, 401 Node.js require() method, 403 package.json, 401 streams functionality, 401 task() method, 401 use strict statement, 403 H Handlebars.js Handlebars.compile() method, 354 HTML, 355 JavaScript data hash, 354 Mustache format, 353 High-quality JavaScript code quality measurement (see Code quality measurement) runtime errors, 79 static code analysis (see Static code analysis, JS) unit testing frameworks input combination, 72 Jasmine project, 72 75, 77 matchers, web browsers, 65 HTML. See HyperText Markup Language (HTML) HTML5 application cache, http module API documentation, 374 local web server, 372 web server frameworks, 373 HyperText Markup Language (HTML) Ajax, 342 server-side, 342 superfluous information, 343 I ICE framework. See Interactive Connectivity Establishment (ICE) framework Interactive Connectivity Establishment (ICE) framework, 325 Iterator pattern, J, K, L Jasmine unit testing framework add() function, 73 expect() function, 74 extensive documentation, 73 HTML, 75 non-numeric inputs, 75 spec runner, string concatenation, 76 suites, 72 toequal() function, 74 unit testing frameworks,

4 index JavaScript bottlenecks, 435 Chrome and Opera developer tools, 435 code references, 428 console.debug(), 426 console.error(), 426 console.info(), 426 console.log() method, 425 console.timeend(), 427 console.warn(), 426 debugging running (see JavaScript:Debugging running, JavaScript) Firefox developer tools, 436 Google Chrome, 426 memory leaks, 432 Node.js applications, 425 performance measurement, 427 JavaScript applications arrays uses (see Arrays) Document Object Manipulation CSS style, existing elements closing, minimise access to page elements, offline DOM, 100 DOM event performance event delegation, rapid-fire events, 103 websites and applications, 101 function performance function return values storing, 104 generic memoization to function, 106 memoization technique, 105 page loading time compilation, 92 global variables, Google Closure Compiler, for code compilation, GZip encode delivery, 91 HTML tag order matters, 91 JSMin for code minification, lazy loading JavaScript Files, minification, 92 obfuscation, 92 UglifyJS for code obfuscation, performance measurements, regular expressions characters, 107 character sequence, 109 definition, 106 modifiers, 108 RegExp constructor, 107 string replace() method, 108 string replace() method call, 109 String type methods, 108 Web workers, offload intensive tasks configuration, 114 creation, 113 image data processing, terminate() method, 114 user interface, 113 W3C standardized version, 113 JavaScript applications (see Architectural patterns) JavaScript lint (JSLint) alert method, 67 C language, 65 Class object, 68 computer s processor, 65 directive, 67 frameworks, 69 function keyword, 66 NPM tool, 69 running code, 67 JavaScript task runner, grunts API, 394 CLI tool, 393 command line, 395 devdependencies, 393 file.readjson() method, 396 file.readyaml() method, 397 Gruntfile.js, 393 initconfig() method, 394, 397 JSHint, 394, 398 loadnpmtasks() method, 394 module.exports, 393 multitasks, 398 Node.js packages, 393 package.json, 393, 397 plugin directory, 400 registertask() method, 394 static code analysis, 394 targets, 399 template strings, 397 use strict statement, 396 wealth of resources, 392 JSHint, M Markdown backslash uses, 57 breaking lines and creating paragraphs, 49 code display, 54 content grouping under headings, 49 emphasized text, 53 horizontal rules creation,

5 Index HTML, 57 images insertion, 56 linking to URLs, 55 lists creation, 50 quotes addition, 54 YUIDoc support, 48 Mediator pattern, Memento pattern, Memory leaks, JavaScript garbage collector, 432 heap Snapshot, 433 Internet Explorer 11, profiles tab, 433 removeeventlistener() method, 432 timeline tab, web applications, 432 Mixin pattern, Mobile JavaScript mobile device sensors event framing, sensor data, 250 geolocation sensor, in-built, 240 missing sensors, 249 motion sensors, orientation and direction sensors, touch sensor, mobile web development battery life, 237 network bandwidth speeds and latency, 238 on-board memory size, 238 operating system responsiveness, 239 network connection failures and offline states detection, HTML5 application cache, inconvenient experiences, 251 Web Storage API, , 256 Responsive Web Design, 258 Model-View-Controller (MVC) data structure, 199 addresses management, JavaScript applications, 199 View code, user interface, Model-View-Presenter (MVP) pattern address list application, observer pattern, 214 Model-View-ViewModel (MVVM) pattern data-submit attributes, 215 system, internal business logic, 214 observer pattern, Module pattern, Mustache.js data hash, 345 Google Templates, 345 Mustache.render() method, 346 script tag, 345 N Network Address Translation (NAT), 321 Node.js application platform API documentation, 371 command-line applications, 369 command line arguments, 371 devdependencies, 378 Hello World, 370 hosting solution, 389 http Module, JavaScript, 369 loading modules, 372 log() method, 371 module.exports property, 380 npm, 369, package.json, 376, 378 packages, 374 process.argv array, 372 require() method, web applications, yuidoc application, 376 Node Package Manager (NPM), 58, 69 NPM. See Node Package Manager (NPM) O Object-oriented JavaScript apply and call methods, arguments object, assigning properties and methods prototype, 4, 6 scope, 6 base class creator, chaining methods, classes, 2 coding conventions and naming (see Coding conventions and naming) context and this keyword (see Context and this keyword) custom objects, 1 2 ECMAScript 5 (see ECMAScript 5) encapsulation, 14 inheritance, object s constructor, detection, 3 4 polymorphism,

6 index Object-oriented JavaScript (cont.) public, private, and protected properties and methods, simplifying inheritance, 20, 22 Observer pattern, P, Q Polymorphism, Precompiling templates Handlebars.js compile() method, 360 Mustache library, 360 NPM, 361 templatefile.handlebars, 361 web applications, 364 Production-ready code build tasks, 409 development workflow, 408 Gruntfile.js, 413 Gulp.js, 413, main.js file, 413 public consumption, 408 Promises pattern, Prototype pattern, Proxy pattern, R Responsive Web Design, 258 Runtime errors, JS code quality, 79 custom error, error type, 81 eval error, 80 range error, 80 reference error, 80 syntax error, 79 URI error, 80 wrap code, S Scaffolding generators, 420 time-consuming, 420 Yeoman, 421 Session Description Protocol (SDP), 325 Session Traversal Utilities for NAT (STUN), 325 Singleton pattern, 40, Socket.IO HTML, 388 HTTP methods, 384 JavaScript library, 387 package.json, 386 real-time, 384, 387 socket.broadcast.emit() method, 389 socket.emit() method, 389 W3C WebSocket API, 384 Static code analysis, JS bugs, 65 closure compiler, 70 compiled code, 70 documentation site, 71 JSHint, JSLint, 65, operating system, 71 potential errors, 65 Strategy pattern, Structural design patterns adapter, composite, decorator, description, 137 façade, flyweight, , 150 mixin, module, proxy, STUN. See Session Traversal Utilities for NAT (STUN) T, U Traversal Using Relays around NAT (TURN), 325 TURN. See Traversal Using Relays around NAT (TURN) V Video chat client class, HTML page, JavaScript files, 329 video call, Video chat web application connection and signaling Ajax, 326 ICE framework, 325 NAT, 325 RTCPeerConnection class interface, STUN and TURN, 325 firebase service for simple signaling data-access API, 327 pseudo-json format, WebSocket connections, 326 getusermedia() API method,

7 Index W, X Web applications API documentation, 384 express framework, 382 package.json file, 384 Webcam and microphone browser s window.url.createobjecturl() method, callback function, 322 getusermedia() method accessing the webcam and microphone, 323 onsuccess() callback method, 323 polyfills, 322 Web Real Time Communication (WebRTC) API specification, 321 video chat client, video chat web application, webcam and microphone, WebRTC. See Web Real Time Communication (WebRTC) API Y, Z YUIDoc documentation format block comments, 38 chained methods, 47 classes, constructors, properties and methods Accommodation, 39 fully-documented JavaScript class, 41 property documentation, 40 public variable name, 40 singleton, 40 static class documentation, 40 variables and functions uses, 40 Code editors, 38 code examples, 48 constant value, property containing, 43 events, 47 grouping, related classes, 47 inherited classes, 46 inputs parameters and methods return values dot notation, 42 inputs and outputs, 42 optional method input parameters, 43 private, protected and public methods and properties, 44 tags, 39,