A Index

Symbol

• !x
• ++x
• x++
• +x
• , (comma operator)
• --x
• x--
• -x
• x && y
• x + y
• x - y
• x / y
• x << y
• x === y
• x >>> y
• x >> y
• x ??= y
• x ?? d
• x & y
• x ** y
• x * y
• x ^ y
• x ¦ y
• x ¦¦ y
• x ٪ y
• =
• c ? t : e
• __proto__
• ~x

A

• accessor (object literal)
• addition
• AMD module
• anonymous function expression
• argument
• argument vs. parameter
• Array
• Array hole
• Array index
• Array literal
• Array, dense
• Array, multidimensional
• Array, sparse
• Array-destructuring
• Array-like object
• ArrayBuffer
• Arrays, fixed-layout
• Arrays, sequence
• arrow function
• ASCII escape
• ASI (automatic semicolon insertion)
• assert (module)
• assertion
• assignment operator
• async
• async function
• async function*
• async-await
• asynchronous generator
• asynchronous iterable
• asynchronous iteration
• asynchronous iterator
• asynchronous programming
• attribute of a property
• automatic semicolon insertion (ASI)
• await (async function)
• await (asynchronous generator)

B

• base class
• big endian
• bigint
• BigInt64Array
• BigUint64Array
• binary integer literal
• binding (variable)
• bitwise And
• bitwise Not
• bitwise Or
• bitwise Xor
• boolean
• Boolean()
• bound variable
• break

C

• call stack
• callback (asynchronous pattern)
• callback function
• camel case
• camel case
• case, camel
• case, dash
• case, kebab
• case, snake
• case, underscore
• catch
• class
• class
• class declaration
• class definition
• class expression
• class, base
• class, derived
• class, mixin
• classes, extending
• closure
• code point
• code unit
• coercion
• combinator function, Promise
• comma operator
• CommonJS module
• comparing by identity
• comparing by value
• computed property key
• concatenating strings
• conditional operator
• console
• console.error()
• console.log()
• const
• constant
• constructor function (role of an ordinary function)
• continue
• Converting to [type]
• Coordinated Universal Time (UTC)
• copy object deeply
• copy object shallowly

D

• dash case
• dash case
• DataView
• date
• date time format
• decimal floating point literal
• decimal integer literal
• decrementation operator (prefix)
• decrementation operator (suffix)
• deep copy of an object
• default export
• default value (destructuring)
• default value (parameter)
• default value operator (??)
• delete
• deleting a property
• dense Array
• derived class
• descriptor of a property
• destructive operation
• destructuring
• destructuring an Array
• destructuring an object
• dictionary object
• direct method call
• dispatched method call
• divided by operator
• division
• do-while
• dynamic imports
• dynamic this
• dynamic vs. static

E

• early activation
• Ecma
• ECMA-262
• ECMAScript
• ECMAScript module
• Eich, Brendan
• endianness (Typed Arrays)
• enumerability
• enumerable (property attribute)
• equality operator
• ES module
• escape, ASCII
• escape, Unicode code point
• escape, Unicode code unit
• escaping HTML
• eval()
• evaluating an expression
• event (asynchronous pattern)
• event loop
• exception
• exercises, getting started with
• exponentiation
• export
• export default
• export, default
• export, named
• expression
• extending classes
• extends
• external iteration
• extracting a method

F

• false
• falsiness
• falsy
• finally
• fixed-layout Arrays
• fixed-layout object
• flags (regular expression)
• Float32Array
• Float64Array
• floating point literal
• for
• for-await-of
• for-in
• for-of
• free variable
• freezing an object
• fulfilled (Promise state)
• function declaration
• function expression, anonymous
• function expression, named
• function, arrow
• function, ordinary
• function, roles of an ordinary
• function, specialized
• function*

G

• garbage collection
• generator, asynchronous
• generator, synchronous
• getter (object literal)
• global
• global object
• global scope
• global variable
• globalThis
• GMT (Greenwich Mean Time)
• grapheme cluster
• Greenwich Mean Time (GMT)

H

• heap
• hexadecimal integer literal
• hoisting
• hole in an Array

I

• identifier
• identity of an object
• if
• IIFE (immediately invoked function expression)
• immediately invoked function expression (IIFE)
• import
• import()
• import, named
• import, namespace
• import.meta
• import.meta.url
• imports, dynamic
• imports, static
• in
• incrementation operator (prefix)
• incrementation operator (suffix)
• index of an Array
• Infinity
• inheritance, multiple
• inheritance, single
• instanceof
• instanceof
• Int16Array
• Int32Array
• Int8Array
• integer numbers
• integer, safe
• internal iteration
• iterable (asynchronous)
• iterable (synchronous)
• iteration, asynchronous
• iteration, external
• iteration, internal
• iteration, synchronous
• iterator (asynchronous)
• iterator (synchronous)

J

• JSON (data format)
• JSON (namespace object)

K

• kebab case
• kebab case
• keyword

L

• label
• left shift operator
• let
• lexical this
• listing properties
• little endian
• logical And
• logical Not
• logical Or

M

• Map
• Map
• Map vs. object
• Math (namespace object)
• method
• method (object literal)
• method (role of an ordinary function)
• method call, direct
• method call, dispatched
• method, extracting a
• minus operator (binary)
• minus operator (unary)
• mixin class
• module specifier
• module, AMD
• module, CommonJS
• multidimensional Array
• multiple inheritance
• multiple return values
• multiplication

N

• named export
• named function expression
• named import
• named parameter
• namespace import
• NaN
• node_modules
• npm
• npm package
• null
• nullish coalescing assignment operator (`??=`)
• nullish coalescing operator (??)
• number
• Number()

O

• object
• object literal
• object vs. Map
• object vs. primitive value
• Object()
• object, copy deeply
• object, copy shallowly
• object, dictionary
• object, fixed-layout
• object, freezing an
• object, identity of an
• object-destructuring
• Object.is()
• octal integer literal
• ones’ complement
• operator, assignment
• operator, comma
• operator, default value (??)
• operator, equality
• operator, nullish coalescing (??)
• operator, nullish coalescing assignment (`??=`)
• operator, void
• ordinary function
• ordinary function, roles of an
• overriding a property

P

• package, npm
• package.json
• parameter
• parameter default value
• parameter vs. argument
• passing by identity
• passing by value
• pattern (regular expression)
• pending (Promise state)
• plus operator (binary)
• plus operator (unary)
• polyfill
• polyfill, speculative
• ponyfill
• primitive value
• primitive value vs. object
• private name
• private slot
• prollyfill
• Promise
• Promise
• Promise combinator function
• Promise, states of a
• Promise.all()
• Promise.allSettled()
• Promise.any()
• Promise.race()
• properties, listing
• property
• property (object)
• property attribute
• property descriptor
• property key
• property key, computed
• property key, quoted
• property name
• property symbol
• property value shorthand
• property, deleting a
• prototype
• prototype chain
• public slot
• publicly known symbol

Q

• quizzes, getting started with
• quoted property key

R

• real function (role of an ordinary function)
• receiver
• RegExp
• regular expression
• regular expression literal
• rejected (Promise state)
• remainder operator
• REPL
• replica
• RequireJS
• reserved word
• rest element (Array-destructuring)
• rest parameter (function call)
• rest property (object-destructuring)
• return values, multiple
• revealing module pattern
• roles of an ordinary function
• run-to-completion semantics

S

• safe integer
• scope of a variable
• script
• self
• sequence Arrays
• Set
• Set
• setter (object literal)
• settled (Promise state)
• shadowing
• shallow copy of an object
• shim
• short-circuiting
• signed right shift operator
• single inheritance
• sloppy mode
• slot, private
• slot, public
• snake case
• snake case
• sparse Array
• specialized function
• specifier, module
• speculative polyfill
• spreading (...) into a function call
• spreading into an Array literal
• spreading into an object literal
• statement
• states of a Promise
• static
• static imports
• static vs. dynamic
• strict mode
• string
• String()
• subclass
• subclassing
• subtraction
• superclass
• switch
• symbol
• symbol, publicly known
• synchronous generator
• synchronous iterable
• synchronous iteration
• synchronous iterator
• syntax

T

• tagged template
• task queue
• TC39
• TC39 process
• TDZ (temporal dead zone)
• Technical Committee 39
• template literal
• temporal dead zone
• ternary operator
• this
• this, dynamic
• this, lexical
• this, values of
• throw
• time value
• times operator
• to the power of operator
• trailing commas in Array literals
• trailing commas in JSON
• trailing commas in object literals
• trailing commas in parameter lists
• true
• truthiness
• truthy
• try
• type
• type hierarchy
• type signature
• Typed Array
• typeof

U

• Uint16Array
• Uint32Array
• Uint8Array
• Uint8ClampedArray
• undefined
• underscore case
• underscore case
• Unicode
• Unicode code point escape
• Unicode code unit escape
• Unicode Transformation Format (UTF)
• unit test
• unsigned right shift operator
• UTC (Coordinated Universal Time)
• UTF (Unicode Transformation Format)
• UTF-16
• UTF-32
• UTF-8

V

• value-preservation
• variable, bound
• variable, free
• variable, scope of a
• void operator

W

• WeakMap
• WeakMap
• WeakSet
• WeakSet
• Web Worker
• while
• window
• wrapper types (for primitive types)

Y

• yield (asynchronous generator)
• yield (synchronous generator)
• yield* (asynchronous generator)
• yield* (synchronous generator)

Z

• Z (Zulu Time Zone)
• Zulu Time Zone (Z)