Index
Symbols
- .endsWith(), Well-Known Symbols
- .includes(), Well-Known Symbols
- .keys(), First Look into ES6 Maps
- .next(), Iterating over Generators by Hand
- .shift(), Spread Operator
- .startsWith(), Well-Known Symbols
- .values(), First Look into ES6 Maps
- /s flag, A New /s “dotAll” Flag
- _secret properties, deleteProperty Trap-deleteProperty Trap, defineProperty Trap
A
- abstractions, Complexity Creep, Abstractions, and Conventions
- accessors, Properties and Methods in Classes-Properties and Methods in Classes
- aliases, Destructuring Objects-Destructuring Objects
- AngularJS, JavaScript Modules
- anonymous functions, Arrow Functions-Lexical Scoping
- .apply(), Spread Operator-Spread Operator
- apply trap, apply Trap-apply Trap
- arguments, Array.from-Array.from
- arguments object, Lexical Scoping
- arrays, Array-Array.prototype[Symbol.iterator]
- Array#copyWithin, Array#copyWithin-Array#copyWithin
- Array#entries, Array#entries
- Array#fill, Array#fill
- Array#find, Array#find and Array#findIndex
- Array#findIndex, Array#find and Array#findIndex
- Array#keys, Array#keys
- Array#slice, Array.from, Array#copyWithin
- Array#splice, Array#copyWithin
- Array#values, Array#values
- Array.from, Infinite Sequences, Asynchronous Iteration, Array.from-Array.of
- Array.of, Array.of
- Array.prototype[Symbol.iterator], Array.prototype[Symbol.iterator]
- arrays, Feature Themes in ES6, Destructuring Arrays-Destructuring Arrays, Rest and Spread
- arrow functions, Method Definitions-Assignment Destructuring, Savoring Function Flavors-Savoring Function Flavors
- assignment destructuring, Assignment Destructuring-Use Cases for Destructuring
- async/await, Feature Themes in ES6, Asynchronous Code Flows
- asynchronous code, Dealing with Asynchronous Flows
- asynchronous functions, Async Functions-Understanding Async Function Internals
- asynchronous iteration, Asynchronous Iteration
C
- callbacks, Getting Started with Promises, Flavors of Async Code, Asynchronous Code Flows
- catch, Error Handling
- chained promises, Flavors of Async Code
- chaining, Getting Started with Promises-Promise Continuation and Chaining
- classes, Classes-Extending JavaScript Classes, Classes and Proxies-Classes and Proxies
- coding style conventions, Code Quality and Consistency with ESLint
- CommonJS, CommonJS-CommonJS, export Statements
- compilers, Browser Support and Complementary Tooling
- complexity creep, Complexity Creep, Abstractions, and Conventions
- computed property keys, Template Literals
- computed property names, Computed Property Names-Computed Property Names, Destructuring Objects
- console.log, Generator Fundamentals
- const statements, Const Statements-Merits of const and let, Variable Declarations-Variable Declarations
- construct trap, construct Trap-construct Trap
- constructor(), Class Fundamentals-Class Fundamentals, Properties and Methods in Classes
- conventions, Complexity Creep, Abstractions, and Conventions
- coordinates object, Destructuring Arrays
- copyWithin, Array#copyWithin
D
- Date(), Spread Operator
- Decorators, Decorators-Marking Properties in JavaScript
- default exports, importing, Importing default exports
- defineProperty trap, defineProperty Trap-defineProperty Trap
- deleteProperty trap, deleteProperty Trap-deleteProperty Trap
- deprecation, setPrototypeOf Trap
- descriptors, A Primer on JavaScript Decorators-Stacking Decorators and a Warning About Immutability
- destructuring, Assignment Destructuring-Use Cases for Destructuring, Infinite Sequences, First Look into ES6 Maps
- DOM elements
- done, Asynchronous Iteration
- dotAll proposal, A New /s “dotAll” Flag
- double functions, Arrow Function Flavors
- dynamic import(), Dynamic import()-Dynamic import()
E
- ECMAScript (ES), Leveraging ECMAScript Collections-ES6 WeakSets
- emitter object, Method Definitions-Method Definitions
- .endsWith(), Well-Known Symbols
- entity.id field, Computed Property Names
- EPSILON, Number.EPSILON
- error property, Computed Property Names
- ES6 maps, Using ES6 Maps-First Look into ES6 Maps
- ES6 maturity stages, ECMAScript as a Rolling Standard
- ES6 modules, JavaScript Modules-Practical Considerations for ES Modules
- ES6 sets, Sets in ES6-ES6 WeakSets
- escapes, Unicode Property Escapes
- ESLint, Code Quality and Consistency with ESLint-Code Quality and Consistency with ESLint, Template Literals
- events, Getting Started with Promises-Getting Started with Promises, Asynchronous Code Flows
- export statements, export Statements-Exporting from another module
- expression interpolation, Template Literals
F
- feature themes, Feature Themes in ES6-Feature Themes in ES6
- fetch, Getting Started with Promises-Getting Started with Promises
- flow control (see promises)
- for await..of, Async Iterators
- for..of, Infinite Sequences-Infinite Sequences, Generator Fundamentals, Iterating over Generators by Hand, Mixing Generators into Iterables, First Look into ES6 Maps
- function declarations, Savoring Function Flavors, Savoring Function Flavors
- function expressions, Savoring Function Flavors-Savoring Function Flavors
- function keyword, Method Definitions
- function parameters, Function Parameter Defaults-Use Cases for Destructuring
- function*, Generator Fundamentals
G
- g.return(value), Returning on Behalf of a Generator-Returning on Behalf of a Generator
- g.throw, Throwing Errors at a Generator-Throwing Errors at a Generator
- generators, Feature Themes in ES6, Generator Functions and Generator Objects-Asynchronous I/O Using Generators, Asynchronous Code Flows
- async, Async Generators
- and asynchronous input/output, Asynchronous I/O Using Generators-Asynchronous I/O Using Generators
- asynchronous flows, Dealing with Asynchronous Flows-Dealing with Asynchronous Flows
- consuming generator functions for flexibility, Consuming Generator Functions for Flexibility-Consuming Generator Functions for Flexibility
- fundamentals, Generator Fundamentals-Generator Fundamentals
- iterating over by hand, Iterating over Generators by Hand-Mixing Generators into Iterables
- mixing into iterables, Mixing Generators into Iterables
- returns in, Returning on Behalf of a Generator-Returning on Behalf of a Generator
- throwing errors at, Throwing Errors at a Generator-Throwing Errors at a Generator
- in tree traversal, Tree Traversal Using Generators-Tree Traversal Using Generators
- get traps, Trapping get Accessors-Trapping get Accessors
- getGraphemes, A Proposal to Split Grapheme Segments
- getOwnPropertyDescriptor trap, getOwnPropertyDescriptor Trap-getOwnPropertyDescriptor Trap
- getPrototypeOf trap, getPrototypeOf Trap-getPrototypeOf Trap
- getRandomArticle, Flavors of Async Code-Flavors of Async Code
- getters, Properties and Methods in Classes, Properties and Methods in Classes
- global symbol registry, Global Symbol Registry-Best practices and considerations
- grapheme segments, A Proposal to Split Grapheme Segments
I
- IIFE (Immediately Invoked Function Expression), Practical Considerations for ES Modules
- import statements, import Statements-Wildcard import statements
- .includes(), Well-Known Symbols
- infinite sequences, Infinite Sequences-Infinite Sequences
- interval, Async Iterators
- Intl.Segmenter, A Proposal to Split Grapheme Segments
- isExtensible trap, isExtensible Trap
- isFinite, Number.isFinite
- isInteger, Number.isInteger
- isNaN, Number.isNaN
- isNumber, Number.isNaN
- iterable protocol, Spread Operator, Symbols
- iteration protocol, Iterator Protocol and Iterable Protocol-Building Versatility Into Iterating a Playlist
- Array.from method, Understanding Iteration Principles-Understanding Iteration Principles
- asychronous iterators (see asynchronous iterators)
- for..of method, Understanding Iteration Principles-Understanding Iteration Principles
- in generators (see generators)
- in maps, First Look into ES6 Maps
- infinite sequences, Infinite Sequences-Infinite Sequences
- iterating a playlist, Building Versatility Into Iterating a Playlist-Building Versatility Into Iterating a Playlist
- iterator/iterable distinction, Understanding Iteration Principles
- object maps as key/value pairs, Iterating Object Maps as Key/Value Pairs-Iterating Object Maps as Key/Value Pairs
- sequence object, Understanding Iteration Principles-Understanding Iteration Principles
- spread operator, Understanding Iteration Principles, Understanding Iteration Principles
- iterators, Feature Themes in ES6, Asynchronous Code Flows
- (see also iteration protocol)
L
- let statements, let and const Statements-Temporal Dead Zone, Merits of const and let-Merits of const and let, Variable Declarations-Variable Declarations
- lexical scoping, Lexical Scoping-Lexical Scoping
- lint tools, Code Quality and Consistency with ESLint-Code Quality and Consistency with ESLint
- lists, exporting, Exporting lists
- LiveScript, A Brief History of JavaScript Standards
- LiveWire, A Brief History of JavaScript Standards
- local symbols, Local Symbols-Local Symbols
- lookahead assertions, Lookbehind Assertions
- lookbehind assertions, Lookbehind Assertions-Lookbehind Assertions
M
- Map, Using ES6 Maps
- Map#entries, Sets in ES6
- map.delete, First Look into ES6 Maps
- map.get, First Look into ES6 Maps
- map.has, First Look into ES6 Maps
- map.set, First Look into ES6 Maps
- matchAll, String#matchAll-String#matchAll
- Math, Feature Themes in ES6
- Math.acosh(value), Trigonometric Functions
- Math.asinh(value), Trigonometric Functions
- Math.atanh(value), Trigonometric Functions
- Math.cbrt, Math.cbrt
- Math.ceil, Math.trunc
- Math.clz32, Math.clz32
- Math.cosh(value), Trigonometric Functions
- Math.E, Math.expm1
- Math.expm1, Math.expm1
- Math.floor, Math.trunc
- Math.fround, Math.fround
- Math.hypot, Math.hypot
- Math.imul, Math.imul
- Math.LN2, Math.log2
- Math.log10, Math.log10
- Math.log1p, Math.log1p
- Math.log2, Math.log2
- Math.sign, Math.sign
- Math.sinh(value), Trigonometric Functions
- Math.sqrt, Math.cbrt
- Math.tanh(value), Trigonometric Functions
- Math.trunc, Math.trunc
- method definitions, Method Definitions-Method Definitions
- methods, Properties and Methods in Classes-Properties and Methods in Classes
- Microsoft, A Brief History of JavaScript Standards-A Brief History of JavaScript Standards
- module.exports, Named exports
- Mozilla, A Brief History of JavaScript Standards
- multiline strings, Multiline Template Literals-Multiline Template Literals, Template Literals
- multiply(), Spread Operator
N
- named capture groups, Named Capture Groups-Named Capture Groups
- named exports, Named exports
- NaN, Comparing Objects with Object.is
- Netscape, A Brief History of JavaScript Standards-A Brief History of JavaScript Standards
- new Array, Array.of
- next, Infinite Sequences, Mixing Generators into Iterables, Asynchronous Iteration
- .next(), Iterating over Generators by Hand
- Node.js, Introduction to the Babel Transpiler, CommonJS
- npm, Introduction to the Babel Transpiler, Code Quality and Consistency with ESLint
- Number, Feature Themes in ES6
- Number.EPSILON, Number.EPSILON-Number.EPSILON
- Number.isFinite, Number.isFinite-Number.isFinite
- Number.isInteger, Number.isInteger
- Number.isNaN, Number.isNaN-Number.isNaN
- Number.isSafeInteger, Number.isSafeInteger-Number.isSafeInteger
- Number.parseFloat, Number.parseFloat
- Number.parseInt, Number.parseInt-Number.parseInt
O
- object literals, Object Literals-Method Definitions
- object maps, Iterating Object Maps as Key/Value Pairs-Iterating Object Maps as Key/Value Pairs
- object property keys, Template Literals
- object spread, Rest and Spread
- Object.assign, Extending Objects with Object.assign-Extending Objects with Object.assign
- Object.create, Extending JavaScript Classes
- Object.create(), Object.setPrototypeOf
- Object.getOwnPropertySymbol, Defining protocols through symbols
- Object.is, Comparing Objects with Object.is
- Object.setPrototypeOf, Object.setPrototypeOf-Object.setPrototypeOf
- objects
- octal literals, Binary and Octal Literals
- options object, Function Parameter Defaults-Function Parameter Destructuring
- ownKeys trap, ownKeys Trap-ownKeys Trap
P
- package.json, Introduction to the Babel Transpiler
- padEnd, String Padding and Trimming
- padStart, String Padding and Trimming
- parseFloat, Number.parseFloat
- parseInt, Number.parseInt
- polyfills, Feature Themes in ES6
- prettier, Code Quality and Consistency with ESLint
- preventExtensions trap, preventExtensions Trap-isExtensible Trap
- Promise#finally, Promise#finally Proposal-Promise#finally Proposal
- Promise.all, Leveraging Promise.all and Promise.race-Leveraging Promise.all and Promise.race, Concurrent Async Flows
- Promise.race, Leveraging Promise.all and Promise.race-Iterator Protocol and Iterable Protocol, Concurrent Async Flows
- promises, Feature Themes in ES6, Promises-Iterator Protocol and Iterable Protocol, Asynchronous Code Flows-Asynchronous Code Flows
- as alternative to callbacks and events, Getting Started with Promises-Getting Started with Promises
- as tree structure, Promise Continuation and Chaining
- basics of, Getting Started with Promises-Getting Started with Promises
- chaining, Getting Started with Promises-Promise Continuation and Chaining, Flavors of Async Code
- and concurrent tasks, Leveraging Promise.all and Promise.race-Iterator Protocol and Iterable Protocol
- creating from scratch, Creating a Promise from Scratch-Creating a Promise from Scratch
- defined, Promises
- error capturing, Promise Continuation and Chaining-Promise Continuation and Chaining
- in fetch, Getting Started with Promises-Getting Started with Promises
- Promise#finally proposal, Promise#finally Proposal-Promise#finally Proposal
- resolving and rejecting, Creating a Promise from Scratch-Creating a Promise from Scratch
- states of, Promise States and Fates-Promise States and Fates
- properties, Properties and Methods in Classes-Properties and Methods in Classes
- property value shorthands, Property Value Shorthands-Property Value Shorthands
- proposal stages, ECMAScript as a Rolling Standard
- protocols, Defining protocols through symbols-Defining protocols through symbols
- prototypal inheritance, Classes, Extending JavaScript Classes-Extending JavaScript Classes
- proxies, Managing Property Access with Proxies-isExtensible Trap, Classes and Proxies-Classes and Proxies
- apply trap, apply Trap-apply Trap
- construct trap, construct Trap-construct Trap
- defineProperty trap, defineProperty Trap-defineProperty Trap
- deleteProperty trap, deleteProperty Trap-deleteProperty Trap
- get traps and, Trapping get Accessors-Trapping get Accessors
- getOwnPropertyDescriptor trap, getOwnPropertyDescriptor Trap-getOwnPropertyDescriptor Trap
- getPrototypeOf trap, getPrototypeOf Trap-getPrototypeOf Trap
- has trap, has Trap-has Trap
- isExtensible trap, isExtensible Trap
- no-op forwarding proxy, Getting Started with Proxy
- overview, Getting Started with Proxy-Getting Started with Proxy
- ownKeys trap, ownKeys Trap-ownKeys Trap
- preventExtensions trap, preventExtensions Trap-isExtensible Trap
- revokable, Revocable Proxies-Revocable Proxies
- schema validation with, Schema Validation with Proxies-Schema Validation with Proxies
- set traps and, Trapping set Accessors-Trapping set Accessors
- setPrototypeOf trap, setPrototypeOf Trap-setPrototypeOf Trap
- proxy objects, Feature Themes in ES6
- proxy.exposed, Getting Started with Proxy
R
- Reflect, Trapping get Accessors
- regular expressions, Regular Expressions-String#matchAll
- render, CommonJS
- require, CommonJS, CommonJS
- RequireJS, JavaScript Modules
- rest parameters, Rest Parameters-Rest Parameters
- return, Iterating over Generators by Hand
- return statement, Arrow Function Flavors
- revokable proxies, Revocable Proxies-Revocable Proxies
- RunUO, Use Case By Example: Attributes in C#-Use Case By Example: Attributes in C#
S
- /s flag, A New /s “dotAll” Flag
- SameValue, Comparing Objects with Object.is
- SameValueZero, First Look into ES6 Maps
- schema validation, Schema Validation with Proxies-Schema Validation with Proxies
- _secret properties, defineProperty Trap
- sequence, Asynchronous Iteration
- Set, Sets in ES6-ES6 WeakSets
- set traps, Trapping set Accessors-Trapping set Accessors
- Set#entries, Sets in ES6
- Set#keys, Sets in ES6
- Set#values, Sets in ES6
- setPrototypeOf trap, setPrototypeOf Trap-setPrototypeOf Trap
- setters, Properties and Methods in Classes, Properties and Methods in Classes
- .shift(), Spread Operator
- shorthand notation, Shorthand Notation and Object Destructuring-Shorthand Notation and Object Destructuring
- sign, Math.sign
- spawn, Understanding Async Function Internals-Understanding Async Function Internals
- SpiderMonkey, A Brief History of JavaScript Standards
- spread operator, Spread Operator-Template Literals, Understanding Iteration Principles, Understanding Iteration Principles, First Look into ES6 Maps, Array.from, Rest and Spread-Rest and Spread
- standards evolution, A Brief History of JavaScript Standards-A Brief History of JavaScript Standards
- startIndex, String#startsWith
- .startsWith(), Well-Known Symbols
- static methods, Properties and Methods in Classes
- sticky matching (y), Sticky Matching Flag /y
- strict mode, Strict Mode-Strict Mode, Template Literals
- string interpolation, String Interpolation-String Interpolation
- String#codePointAt, String#codePointAt-String.fromCodePoint
- String#endsWith, String#endsWith
- String#includes, String#includes
- String#indexOf, String#startsWith, String#includes
- String#length, String.prototype[Symbol.iterator]
- String#matchAll proposal, String#matchAll-String#matchAll
- String#normalize, String#normalize
- String#padEnd, String Padding and Trimming-String Padding and Trimming
- String#padStart, String Padding and Trimming-String Padding and Trimming
- String#repeat, String#repeat-String Padding and Trimming
- String#replace, Named Capture Groups
- String#startsWith, String#startsWith-String#startsWith
- String#trimEnd, String Padding and Trimming
- String#trimStart, String Padding and Trimming
- String.fromCodePoint, String.fromCodePoint
- String.prototype[Symbol.iterator], String.prototype[Symbol.iterator]-String.prototype[Symbol.iterator]
- strings, Feature Themes in ES6
- strings, multiline, Multiline Template Literals-Multiline Template Literals
- success property, Computed Property Names
- Symbol.asyncIterator, Async Iterators
- Symbol.iterator, Understanding Iteration Principles-Understanding Iteration Principles, Iterating Object Maps as Key/Value Pairs-Iterating Object Maps as Key/Value Pairs, Asynchronous Iteration
- (see also iteration protocols)
- symbols, Symbols-Shared across realms but not in the registry
- as property keys, Local Symbols
- defining protocols through, Symbols, Defining protocols through symbols-Defining protocols through symbols
- for debugging, Local Symbols
- for DOM element mapping, Practical Use Cases for Symbols-Practical Use Cases for Symbols
- global symbol registry, Global Symbol Registry-Best practices and considerations
- hidden properties of, Local Symbols
- local, Local Symbols-Local Symbols
- Symbol.for(key), Getting symbols with Symbol.for(key)
- Symbol.iterator, Shared across realms but not in the registry
- Symbol.keyFor(symbol), Using Symbol.keyFor(symbol) to retrieve symbol keys
- Symbol.match, Well-Known Symbols
- Symbol.toPrimitive, Well-Known Symbols
- use cases for, Practical Use Cases for Symbols-Defining protocols through symbols
- well-known, Well-Known Symbols-Shared across realms but not in the registry
- syntactic sugar, Feature Themes in ES6, ES6 Essentials, Understanding Async Function Internals
T
- tagged templates, Tagged Templates-Tagged Templates, Template Literals
- take, Infinite Sequences
- target, Managing Property Access with Proxies
- target.exposed, Getting Started with Proxy
- TC39 standards committee, A Brief History of JavaScript Standards-ECMAScript as a Rolling Standard
- template literals, Template Literals-Tagged Templates, Template Literals-Template Literals
- temporal dead zone (TDZ), Temporal Dead Zone-Temporal Dead Zone
- throw, Iterating over Generators by Hand
- ToInteger, String#repeat
- transpilers, Browser Support and Complementary Tooling-Introduction to the Babel Transpiler
- traps, Getting Started with Proxy-Trapping set Accessors
- apply trap, apply Trap-apply Trap
- construct trap, construct Trap-construct Trap
- defineProperty trap, defineProperty Trap-defineProperty Trap
- deleteProperty trap, deleteProperty Trap-deleteProperty Trap
- get traps, Trapping get Accessors-Trapping get Accessors
- getOwnPropertyDescriptor trap, getOwnPropertyDescriptor Trap-getOwnPropertyDescriptor Trap
- getPrototypeOf trap, getPrototypeOf Trap-getPrototypeOf Trap
- has trap, has Trap-has Trap
- isExtensible trap, isExtensible Trap
- ownKeys trap, ownKeys Trap-ownKeys Trap
- preventExtensions trap, preventExtensions Trap-isExtensible Trap
- set traps, Trapping set Accessors-Trapping set Accessors
- setPrototypeOf trap, setPrototypeOf Trap-setPrototypeOf Trap
- tree traversal, Tree Traversal Using Generators-Tree Traversal Using Generators
- trigonometric functions, Trigonometric Functions
- trimEnd, String Padding and Trimming
- trimStart, String Padding and Trimming
- try/catch, Error Handling
Practical Modern JavaScript
Published by
O'Reilly Media, Inc., 2017