YouDon’tKnowJSAsync&Performance

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ASYNC

& I

PERFORMANCE

KYLE SIMPSON

“Kyle wrangles the asynchronous nature of JavaScript and

shows you how to straighten it out with promises and generators.”

—MARC GRABANSKI, CEO & UI Developer, Frontend Masters

YOU DON’T KNOW JAVASCRIPT

KYLE SIMPSON

ASYNC & PERFORMANCE

JAVASCRIPT

Twitter: @oreillymedia

facebook.com/oreilly

No matter how much experience you have with JavaScript, odds are you don’t fully understand

the language. As part of the

You Don’t Know JS

series, this concise yet in-depth guide focuses

on new asynchronous features and performance techniques—including Promises, generators,

and Web Workers—that let you create sophisticated single-page web applications

and

escape

callback hell in the process.

Like other books in this series,

You Don’t Know JS: Async & Performance

dives into trickier parts of

the language that many JavaScript programmers simply avoid. Armed with this knowledge, you can

become a true JavaScript master.

WITH THIS BOOK YOU WILL:

■

Explore old and new JavaScript methods for handling asynchronous programming

■

Escape from “callback hell,” using JavaScript Promises to ﬁx “inversion of control.”

■

Use generators to express async ﬂow in a sequential, synchronous-looking fashion

■

Tackle program-level performance with Web Workers, SIMD, and asm.js

■

Learn valuable resources and techniques for benchmarking and tuning your

expressions and statements

KYLE SIMPSON is an Open Web evangelist who’s passionate about all things JavaScript. He’s an author,

workshop trainer, tech speaker, and OSS contributor/leader.

ASYNC

PERFORMANCE

The

YOU DON’T KNOW JS

series includes:

■

Up & Going

■

Scope & Closures

■

this & Object Prototypes

■

Types & Grammar

■

Async & Performance

■

ES6 & Beyond

oreilly.com

YouDontKnowJS.com

ISBN: 978-1-491-90422-0

US $24.99 CAN $28.99

JAVASCRIPT

Table of Contents

Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Asynchrony: Now & Later. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

A Program in Chunks 2

Event Loop 5

Parallel Threading 8

Concurrency 13

Jobs 23

Statement Ordering 24

Review 27

Callbacks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Continuations 30

Sequential Brain 31

Trust Issues 39

Trying to Save Callbacks 44

Review 48

Promises. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

What Is a Promise? 52

Thenable Duck Typing 64

Promise Trust 67

Chain Flow 76

Error Handling 87

Promise Patterns 94

iii

剩余294页未读，继续阅读

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2021-03-26

这本不错，是印刷版

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