JavaScript
The New Toys
(Sprache: Englisch)
All of JavaScript's newest features, in depth, made easy to understand.
JavaScript is a rapidly changing language and it can be challenging to keep up with all the new toys being added. JavaScript: The New Toys explores the newest features of the...
JavaScript is a rapidly changing language and it can be challenging to keep up with all the new toys being added. JavaScript: The New Toys explores the newest features of the...
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Klappentext zu „JavaScript “
All of JavaScript's newest features, in depth, made easy to understand.JavaScript is a rapidly changing language and it can be challenging to keep up with all the new toys being added. JavaScript: The New Toys explores the newest features of the world's most popular programming language while also showing readers how to track what's coming next. After setting the stage by covering who manages the process of improving JavaScript, how new features get introduced, terminology, and a high-level overview of new features, it details each new or updated item in depth, with example uses, possible pitfalls, and expert recommendations for updating old habits in light of new features. JavaScript: The New Toys:
* Covers all the additions to JavaScript in ES2015-ES2020 plus a preview of what's coming next
* Explores the latest syntax: nullish coalescing, optional chaining, let and const, class syntax, private methods, private fields, new.target, numeric separators, BigInt, destructuring, default parameters, arrow functions, async functions, await, generator functions, ... (rest and spread), template literals, binary and octal literals, ** (exponentiation), computed property/method names, for-of, for-await-of, shorthand properties, and others
* Details the new features and patterns including modules, promises, iteration, generators, Symbol, Proxy, reflection, typed arrays, Atomics, shared memory, WeakMap, WeakSet, and more
* Highlights common pitfalls and explains how to avoid them
* Shows how to follow the improvements process and even participate in the process yourself
* Explains how to use new features even before they're widely supported
With its comprehensive coverage and friendly, accessible style, JavaScript: The New Toys provides an invaluable resource for programmers everywhere, whether they work in web development, Node.js, Electron, Windows Universal Apps, or another JavaScript environment.
Inhaltsverzeichnis zu „JavaScript “
Introduction xxxiChapter 1: The New Toys In ES2015-ES2020, and Beyond 1
Definitions, Who's Who, and Terminology 2
What are the "New Toys"? 4
How Do New Toys Get Created? 6
Keeping Up with the New Toys 9
Using Today's Toys in Yesterday's Environments, and Tomorrow's Toys Today 10
Review 15
Chapter 2: Block-Scoped Declarations: Let and Const 17
An Introduction to let and const 18
True Block Scope 18
Repeated Declarations are an Error 19
Hoisting and the Temporal Dead Zone 20
A New Kind of Global 22
const: Constants for JavaScript 24
Block Scope in Loops 26
Old Habits to New 36
Chapter 3: New Function Features 39
Arrow Functions and Lexical this, super, etc. 40
Default Parameter Values 45
"Rest" Parameters 50
Trailing Commas in Parameter Lists and Function Calls 52
The Function name Property 53
Function Declarations in Blocks 55
Function Declarations in Blocks: Standard Semantics 57
Old Habits to New 60
Chapter 4: Classes 65
What is a Class? 66
Introducing the New class Syntax 66
Comparing with the Older Syntax 75
Creating Subclasses 77
Leaving Off Object.prototype 97
new.target 98
class Declarations vs. class Expressions 101
More to Come 103
Old Habits to New 104
Chapter 5: New Object Features 105
Computed Property Names 106
Shorthand Properties 107
Getting and Setting an Object's Prototype 107
Method Syntax, and super Outside Classes 109
Symbol 112
New Object Functions 120
Symbol.toPrimitive 123
Property Order 125
Property Spread Syntax 127
Old Habits to New 128
Chapter 6: Iterables, Iterators, For-Of, Iterable Spread, Generators
... mehr
131
Iterators, Iterables, the for-of Loop, and Iterable Spread Syntax 131
Generator Functions 146
Old Habits to New 163
Chapter 7: Destructuring 165
Overview 165
Basic Object Destructuring 166
Basic Array (and Iterable) Destructuring 169
Defaults 170
Rest Syntax in Destructuring Patterns 172
Using Different Names 173
Computed Property Names 174
Nested Destructuring 174
Parameter Destructuring 175
Destructuring in Loops 178
Old Habits to New 179
Chapter 8: Promises 181
Why Promises? 182
Promise Fundamentals 182
Using an Existing Promise 186
Adding Handlers to Already Settled Promises 201
Creating Promises 202
Other Promise Utility Methods 207
Promise Patterns 210
Handle Errors or Return the Promise 210
Promises in Series 211
Promises in Parallel 213
Promise Subclasses 218
Old Habits to New 219
Chapter 9: Asynchronous Functions, Iterators, and Generators 221
async Functions 222
async Iterators, Iterables, and Generators 232
for-await-of 238
Old Habits to New 238
Chapter 10: Templates, Tag Functions, and New String Features 241
Template Literals 241
Improved Unicode Support 250
Iteration 255
New String Methods 256
Updates to the match, split, search, and replace Methods 259
Old Habits to New 260
Chapter 11: New Array Features, Typed Arrays 263
New Array Methods 264
&
Iterators, Iterables, the for-of Loop, and Iterable Spread Syntax 131
Generator Functions 146
Old Habits to New 163
Chapter 7: Destructuring 165
Overview 165
Basic Object Destructuring 166
Basic Array (and Iterable) Destructuring 169
Defaults 170
Rest Syntax in Destructuring Patterns 172
Using Different Names 173
Computed Property Names 174
Nested Destructuring 174
Parameter Destructuring 175
Destructuring in Loops 178
Old Habits to New 179
Chapter 8: Promises 181
Why Promises? 182
Promise Fundamentals 182
Using an Existing Promise 186
Adding Handlers to Already Settled Promises 201
Creating Promises 202
Other Promise Utility Methods 207
Promise Patterns 210
Handle Errors or Return the Promise 210
Promises in Series 211
Promises in Parallel 213
Promise Subclasses 218
Old Habits to New 219
Chapter 9: Asynchronous Functions, Iterators, and Generators 221
async Functions 222
async Iterators, Iterables, and Generators 232
for-await-of 238
Old Habits to New 238
Chapter 10: Templates, Tag Functions, and New String Features 241
Template Literals 241
Improved Unicode Support 250
Iteration 255
New String Methods 256
Updates to the match, split, search, and replace Methods 259
Old Habits to New 260
Chapter 11: New Array Features, Typed Arrays 263
New Array Methods 264
&
... weniger
Autoren-Porträt von T. J. Crowder
About the authorT.J. Crowder is a software engineer with 30 years of experience, including over 15 years of professional work in JavaScript. He runs Farsight Software, a software contracting and product company. He's often found helping people on Stack Overflow, where he's a top 10 all-time contributor and the top JavaScript contributor. When not working or writing, he...no, sorry, he's always working or writing - or spending time with his wonderful, supportive wife and fantastic son.
Visit us at www.wiley.com for free code samples.
Bibliographische Angaben
- Autor: T. J. Crowder
- 2020, 1. Auflage, 608 Seiten, Maße: 18,8 x 23,5 cm, Kartoniert (TB), Englisch
- Verlag: Wiley & Sons
- ISBN-10: 1119367956
- ISBN-13: 9781119367956
Sprache:
Englisch
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