JavaScript: The New Toys
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    • Javascript: The New Toys
    • INTRODUCTION
    • WHAT DOES THIS BOOK COVER?
    • WHO SHOULD READ THIS BOOK
    • HOW TO USE THIS BOOK
    • HOW TO CONTACT THE AUTHOR
    • CODE DOWNLOADS FOR THIS CHAPTER
    • DEFINITIONS, WHO'S WHO, AND TERMINOLOGY
    • WHAT ARE THE “NEW TOYS”?
    • HOW DO NEW TOYS GET CREATED?
    • KEEPING UP WITH THE NEW TOYS
    • USING TODAY'S TOYS IN YESTERDAY'S ENVIRONMENTS, AND TOMORROW'S TOYS TODAY
    • USING NODE.JS TO RUN EXAMPLES
    • REVIEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • AN INTRODUCTION TO LET AND CONST
    • TRUE BLOCK SCOPE
    • REPEATED DECLARATIONS ARE AN ERROR
    • HOISTING AND THE TEMPORAL DEAD ZONE
    • A NEW KIND OF GLOBAL
    • ACCESSING THE GLOBAL OBJECT
    • CONST: CONSTANTS FOR JAVASCRIPT
    • BLOCK SCOPE IN LOOPS
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • PARAMETER VS. ARGUMENT
    • ARROW FUNCTIONS AND LEXICAL THIS, SUPER, ETC.
    • WARNING: THE COMMA OPERATOR AND ARROW FUNCTIONS
    • DEFAULT PARAMETER VALUES
    • NON-SIMPLE PARAMETER LISTS AND CHANGING STRICT MODE
    • “REST” PARAMETERS
    • TRAILING COMMAS IN PARAMETER LISTS AND FUNCTION CALLS
    • THE FUNCTION NAME PROPERTY
    • FUNCTION DECLARATIONS IN BLOCKS
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • WHAT IS A CLASS?
    • INTRODUCING THE NEW CLASS SYNTAX
    • COMPARING WITH THE OLDER SYNTAX
    • CREATING SUBCLASSES
    • LEAVING OFF OBJECT.PROTOTYPE
    • NEW.TARGET
    • CLASS DECLARATIONS VS. CLASS EXPRESSIONS
    • MORE TO COME
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • COMPUTED PROPERTY NAMES
    • SHORTHAND PROPERTIES
    • GETTING AND SETTING AN OBJECT'S PROTOTYPE
    • METHOD SYNTAX, AND SUPER OUTSIDE CLASSES
    • SYMBOL
    • “NAME” OR “KEY”?
    • NEW OBJECT FUNCTIONS
    • SYMBOL.TOPRIMITIVE
    • PROPERTY ORDER
    • A MYTH OF ARRAYS
    • PROPERTY SPREAD SYNTAX
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • ITERATORS, ITERABLES, THE FOR-OF LOOP, AND ITERABLE SPREAD SYNTAX
    • ERRORS WHEN THINGS AREN’T ITERABLE
    • GENERATOR FUNCTIONS
    • CONTEXT-SENSITIVE KEYWORDS
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • OVERVIEW
    • BASIC OBJECT DESTRUCTURING
    • BASIC ARRAY (AND ITERABLE) DESTRUCTURING
    • DEFAULTS
    • “FALSY” AND “TRUTHY”
    • REST SYNTAX IN DESTRUCTURING PATTERNS
    • USING DIFFERENT NAMES
    • COMPUTED PROPERTY NAMES
    • NESTED DESTRUCTURING
    • PARAMETER DESTRUCTURING
    • DESTRUCTURING IN LOOPS
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • WHY PROMISES?
    • PROMISE FUNDAMENTALS
    • ERRORS AS REJECTION REASONS
    • USING AN EXISTING PROMISE
    • HANDLERS ARE JUST FUNCTIONS
    • DETECTING UNHANDLED REJECTIONS
    • BOTH OF THEN'S ARGUMENTS ARE OPTIONAL
    • ADDING HANDLERS TO ALREADY SETTLED PROMISES
    • SCRIPT JOBS AND PROMISE JOBS
    • CREATING PROMISES
    • OTHER PROMISE UTILITY METHODS
    • PROMISE PATTERNS
    • PROMISE ANTI-PATTERNS
    • PROMISE SUBCLASSES
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • ASYNC FUNCTIONS
    • SINGLE THREAD PER REALM
    • ASYNC FUNCTION CALLS AT THE TOP LEVEL
    • ASYNC ITERATORS, ITERABLES, AND GENERATORS
    • HOW TO GET %AsyncIteratorPrototype%
    • OLD HABITS TO NEW
    • WROX.COM CODE DOWNLOADS FOR THIS CHAPTER
    • TEMPLATE LITERALS
    • INVALID ESCAPE SEQUENCES IN TEMPLATE LITERALS
    • IMPROVED UNICODE SUPPORT
    • ITERATION
    • NEW STRING METHODS
    • UPDATES TO THE MATCH, SPLIT, SEARCH, AND REPLACE METHODS
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • NEW ARRAY METHODS
    • THE COPYWITHIN RETURN VALUE
    • ITERATION, SPREAD, DESTRUCTURING
    • STABLE ARRAY SORT
    • TYPED ARRAYS
    • MODULO VS. REMAINDER
    • OLD HABITS TO NEW
    • WROX.COM CODE DOWNLOADS FOR THIS CHAPTER
    • MAPS
    • SETS
    • WEAKMAPS
    • PRIVATE CLASS FIELDS
    • WEAKSETS
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • INTRODUCTION TO MODULES
    • MODULE FUNDAMENTALS
    • EXPORTING AN ANONYMOUS FUNCTION OR CLASS DECLARATION
    • CHANGES BETWEEN V8 THROUGH V11 AND V12 AND ABOVE
    • RENAMING EXPORTS
    • RE-EXPORTING EXPORTS FROM ANOTHER MODULE
    • RENAMING IMPORTS
    • IMPORTING A MODULE'S NAMESPACE OBJECT
    • EXPORTING ANOTHER MODULE'S NAMESPACE OBJECT
    • IMPORTING A MODULE JUST FOR SIDE EFFECTS
    • IMPORT AND EXPORT ENTRIES
    • IMPORTS ARE LIVE AND READ-ONLY
    • MODULE NAMESPACE OBJECT PROPERTY DESCRIPTIONS
    • MODULE INSTANCES ARE REALM-SPECIFIC
    • HOW MODULES ARE LOADED
    • IMPORT/EXPORT SYNTAX REVIEW
    • DYNAMIC IMPORT
    • TREE SHAKING
    • BUNDLING
    • IMPORT METADATA
    • WORKER MODULES
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • REFLECT
    • PROXY
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • THE FLAGS PROPERTY
    • NEW FLAGS
    • NAMED CAPTURE GROUPS
    • LOOKBEHIND ASSERTIONS
    • UNICODE FEATURES
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • INTRODUCTION
    • HERE THERE BE DRAGONS!
    • BROWSER SUPPORT
    • SHARED MEMORY BASICS
    • MEMORY IS SHARED, NOT OBJECTS
    • RACE CONDITIONS, OUT-OF-ORDER STORES, STALE VALUES, TEARING, AND MORE
    • THE ATOMICS OBJECT
    • “ATOMIC”?
    • SHARED MEMORY EXAMPLE
    • HERE THERE BE DRAGONS! (AGAIN)
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • BIGINT
    • NEW INTEGER LITERALS
    • NEW MATH METHODS
    • EXPONENTIATION OPERATOR (**)
    • DATE.PROTOTYPE.TOSTRING CHANGE
    • FUNCTION.PROTOTYPE.TOSTRING CHANGE
    • NUMBER ADDITIONS
    • SYMBOL.ISCONCATSPREADABLE
    • VARIOUS SYNTAX TWEAKS
    • VARIOUS STANDARD LIBRARY / GLOBAL ADDITIONS
    • ANNEX B: BROWSER-ONLY FEATURES
    • TAIL CALL OPTIMIZATION
    • OLD HABITS TO NEW
    • CODE DOWNLOADS FOR THIS CHAPTER
    • PUBLIC AND PRIVATE CLASS FIELDS, METHODS, AND ACCESSORS
    • “PUBLIC FIELD” VS. “PROPERTY”
    • THE “SHAPE” OF AN OBJECT, AND SHAPE CHANGES
    • ARROW FUNCTIONS IN INITIALIZERS
    • HOW PRIVATE METHODS ARE LINKED TO OBJECTS
    • PRIVATE IDENTIFIERS MUST BE UNIQUE IN THE CLASS
    • OLD HABITS TO NEW
    • NOTES
    • CODE DOWNLOADS FOR THIS CHAPTER
    • STAGE 3 PROPOSALS MAY CHANGE
    • TOP-LEVEL AWAIT
    • INSTALLING V8
    • WEAKREFS AND CLEANUP CALLBACKS
    • WEAKREFS AND CLEANUP CALLBACKS ARE ADVANCED FEATURES
    • REGEXP MATCH INDICES
    • STRING.PROTOTYPE.REPLACEALL
    • ATOMICS ASYNCWAIT
    • VARIOUS SYNTAX TWEAKS
    • LEGACY DEPRECATED REGEXP FEATURES
    • THANK YOU FOR READING!
    • FEATURES IN ALPHABETICAL ORDER
    • NEW FUNDAMENTALS
    • NEW SYNTAX, KEYWORDS, OPERATORS, LOOPS, AND SIMILAR
    • NEW LITERAL FORMS
    • STANDARD LIBRARY ADDITIONS AND CHANGES
    • MISCELLANEOUS
    • Symbols
    • A
    • B
    • C
    • D
    • E
    • F
    • G
    • H
    • I
    • J
    • K
    • L
    • M
    • N
    • O
    • P
    • R
    • S
    • T
    • U
    • V
    • W
    • X–Y–Z
    • WILEY END USER LICENSE AGREEMENT

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