You Don't Know JS- Async & Performance

1. Introduction

2. Preface

3. Foreword

4. TableofContent

5. Chapter01:Asynchrony:Now&Later

6. Chapter02:Callbacks

7. Chapter03:Promises

TableofContents

Purchasedigital/printcopyfromO'Reilly

TableofContents

Foreword(byJakeArchibald)

Preface

Chapter1:Asynchrony:Now&Later

Chapter2:Callbacks

Chapter3:Promises

Chapter4:Generators

I'msureyounoticed,but"JS"inthebookseriestitleisnotanabbreviationforwordsusedtocurseaboutJavaScript,

thoughcursingatthelanguage'squirksissomethingwecanprobablyallidentifywith!

Fromtheearliestdaysoftheweb,JavaScripthasbeenafoundationaltechnologythatdrivesinteractiveexperiencearound

thecontentweconsume.Whileflickeringmousetrailsandannoyingpop-uppromptsmaybewhereJavaScriptstarted,

nearly2decadeslater,thetechnologyandcapabilityofJavaScripthasgrownmanyordersofmagnitude,andfewdoubtits

importanceattheheartoftheworld'smostwidelyavailablesoftwareplatform:theweb.

Butasalanguage,ithasperpetuallybeenatargetforagreatdealofcriticism,owingpartlytoitsheritagebutevenmoreto

itsdesignphilosophy.Eventhenameevokes,asBrendanEichonceputit,"dumbkidbrother"statusnexttoitsmore

matureolderbrother"Java".Butthenameismerelyanaccidentofpoliticsandmarketing.Thetwolanguagesarevastly

ofthelanguageavastlylesscommonoccurrencethaninmanyotherlanguages.Whereittakesaprettyin-depth

knowledgeofalanguagelikeCorC++towriteafull-scaleprogram,full-scaleproductionJavaScriptcan,andoftendoes,

barelyscratchthesurfaceofwhatthelanguagecando.

Sophisticatedconceptswhicharedeeplyrootedintothelanguagetendinsteadtosurfacethemselvesinseemingly

simplisticways,suchaspassingaroundfunctionsascallbacks,whichencouragestheJavaScriptdevelopertojustusethe

languageas-isandnotworrytoomuchaboutwhat'sgoingonunderthehood.

Itissimultaneouslyasimple,easy-to-uselanguagethathasbroadappeal,andacomplexandnuancedcollectionof

languagemechanicswhichwithoutcarefulstudywilleludetrueunderstandingevenforthemostseasonedofJavaScript

developers.

ThereinliestheparadoxofJavaScript,theAchilles'Heelofthelanguage,thechallengewearepresentlyaddressing.

ThisYouDon'tKnowJavaScriptbookseriesoffersacontrarychallenge:learnanddeeplyunderstandallofJavaScript,

evenandespecially"TheToughParts".

YouDon'tKnowJS

Preface

Mission