This chapter documents JavaScript's standard, built-in objects, including their methods and properties.

The term "global objects" (or standard built-in objects) is not to be confused with the global object. Here, "global objects" refer to objects in the global scope.

The global object can be accessed using the this operator in the global scope. In fact, the global scope consists of the global object's properties, including inherited properties, if any.

Other objects in the global scope are either created by the user script or provided by the host application. The host objects available in browser contexts are documented in the API reference.


Standard objects by category

Value properties

These global properties return a simple value. They have no properties or methods.

  • globalThis
  • Infinity
  • NaN
  • undefined

Function properties

These global functions-functions which are called globally, rather than on an object-directly return their results to the caller.

  • eval()
  • isFinite()
  • isNaN()
  • parseFloat()
  • parseInt()
  • decodeURI()
  • decodeURIComponent()
  • encodeURI()
  • encodeURIComponent()
  • escape() Deprecated
  • unescape() Deprecated

Fundamental objects

These objects represent fundamental language constructs.

  • Object
  • Function
  • Boolean
  • Symbol

Error objects

Error objects are a special type of fundamental object. They include the basic Error type, as well as several specialized error types.

  • Error
  • AggregateError
  • EvalError
  • RangeError
  • ReferenceError
  • SyntaxError
  • TypeError
  • URIError
  • InternalError Non-standard

Numbers and dates

These are the base objects representing numbers, dates, and mathematical calculations.

  • Number
  • BigInt
  • Math
  • Date

Text processing

These objects represent strings and support manipulating them.

  • String
  • RegExp

Indexed collections

These objects represent collections of data which are ordered by an index value. This includes (typed) arrays and array-like constructs.

  • Array
  • Int8Array
  • Uint8Array
  • Uint8ClampedArray
  • Int16Array
  • Uint16Array
  • Int32Array
  • Uint32Array
  • BigInt64Array
  • BigUint64Array
  • Float32Array
  • Float64Array

Keyed collections

These objects represent collections which use keys. The iterable collections (Map and Set) contain elements which are easily iterated in the order of insertion.

  • Map
  • Set
  • WeakMap
  • WeakSet

Structured data

These objects represent and interact with structured data buffers and data coded using JavaScript Object Notation (JSON).

  • ArrayBuffer
  • SharedArrayBuffer
  • DataView
  • Atomics
  • JSON

Managing memory

These objects interact with the garbage collection mechanism.

  • WeakRef
  • FinalizationRegistry

Control abstraction objects

Control abstractions can help to structure code, especially async code (without using deeply nested callbacks, for example).

  • Iterator
  • AsyncIterator
  • Promise
  • GeneratorFunction
  • AsyncGeneratorFunction
  • Generator
  • AsyncGenerator
  • AsyncFunction

Reflection

  • Reflect
  • Proxy

Internationalization

Additions to the ECMAScript core for language-sensitive functionalities.

  • Intl
  • Intl.Collator
  • Intl.DateTimeFormat
  • Intl.DisplayNames
  • Intl.DurationFormat
  • Intl.ListFormat
  • Intl.Locale
  • Intl.NumberFormat
  • Intl.PluralRules
  • Intl.RelativeTimeFormat
  • Intl.Segmenter

Source: Mozilla, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.

Last modified: Monday, 17 July 2023, 8:38 AM