All built in javascript objects

Standard built-in objects

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

The term «global objects» (or standard built-in objects) here is not to be confused with the global object. Here, global objects refer to objects in the global scope. The global object itself can be accessed using the this operator in the global scope (but only if ECMAScript 5 strict mode is not used; in that case it returns undefined ). In fact, the global scope consists of the properties of the global object, 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. For more information about the distinction between the DOM and core JavaScript, see JavaScript technologies overview.

Standard objects by category

Value properties

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

Function properties

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

Fundamental objects

These are the fundamental, basic objects upon which all other objects are based. This includes objects that represent general objects, functions, and errors.

Numbers and dates

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

Text processing

These objects represent strings and support manipulating them.

Indexed collections

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

Keyed collections

These objects represent collections which use keys; these contain elements which are iterable in the order of insertion.

Vector collections

SIMD vector data types are objects where data is arranged into lanes.

Structured data

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

Control abstraction objects

Reflection

Internationalization

Additions to the ECMAScript core for language-sensitive functionalities.

WebAssembly

Non-standard objects

Other

Document Tags and Contributors

1. JavaScript
2. Tutorials:
3. Complete beginners
   1. JavaScript basics
   2. JavaScript first steps
   3. JavaScript building blocks
   4. Introducing JavaScript objects
   1. Introduction
   2. Grammar and types
   3. Control flow and error handling
   4. Loops and iteration
   5. Functions
   6. Expressions and operators
   7. Numbers and dates
   8. Text formatting
   9. Regular expressions
   10. Indexed collections
   11. Keyed collections
   12. Working with objects
   13. Details of the object model
   14. Iterators and generators
   15. Meta programming
   1. A re-introduction to JavaScript
   2. JavaScript data structures
   3. Equality comparisons and sameness
   4. Closures
   1. Inheritance and the prototype chain
   2. Strict mode
   3. JavaScript typed arrays
   4. SIMD types
   5. Memory Management
   6. Concurrency model and Event Loop
   1. Array
   2. ArrayBuffer
   3. AsyncFunction
   4. Atomics
   5. Boolean
   6. DataView
   7. Date
   8. Error
   9. EvalError
   10. Float32Array
   11. Float64Array
   12. Function
   13. Generator
   14. GeneratorFunction
   15. Infinity
   16. Int16Array
   17. Int32Array
   18. Int8Array
   19. InternalError
   20. Intl
   21. Intl.Collator
   22. Intl.DateTimeFormat
   23. Intl.NumberFormat
   24. Iterator
   25. JSON
   26. Map
   27. Math
   28. NaN
   29. Number
   30. Object
   31. ParallelArray
   32. Promise
   33. Proxy
   34. RangeError
   35. ReferenceError
   36. Reflect
   37. RegExp
   38. SIMD
   39. SIMD.Bool16x8
   40. SIMD.Bool32x4
   41. SIMD.Bool64x2
   42. SIMD.Bool8x16
   43. SIMD.Float32x4
   44. SIMD.Float64x2
   45. SIMD.Int16x8
   46. SIMD.Int32x4
   47. SIMD.Int8x16
   48. SIMD.Uint16x8
   49. SIMD.Uint32x4
   50. SIMD.Uint8x16
   51. Set
   52. SharedArrayBuffer
   53. StopIteration
   54. String
   55. Symbol
   56. SyntaxError
   57. TypeError
   58. TypedArray
   59. URIError
   60. Uint16Array
   61. Uint32Array
   62. Uint8Array
   63. Uint8ClampedArray
   64. WeakMap
   65. WeakSet
   66. WebAssembly
   67. decodeURI()
   68. decodeURIComponent()
   69. encodeURI()
   70. encodeURIComponent()
   71. escape()
   72. eval()
   73. isFinite()
   74. isNaN()
   75. null
   76. parseFloat()
   77. parseInt()
   78. undefined
   79. unescape()
   80. uneval()
   1. Arithmetic operators
   2. Array comprehensions
   3. Assignment operators
   4. Bitwise operators
   5. Comma operator
   6. Comparison operators
   7. Conditional (ternary) Operator
   8. Destructuring assignment
   9. Expression closures
   10. Generator comprehensions
   11. Grouping operator
   12. Legacy generator function expression
   13. Logical Operators
   14. Object initializer
   15. Operator precedence
   16. Property accessors
   17. Spread syntax
   18. async function expression
   19. await
   20. class expression
   21. delete operator
   22. function expression
   23. function* expression
   24. in operator
   25. instanceof
   26. new operator
   27. new.target
   28. super
   29. this
   30. typeof
   31. void operator
   32. yield
   33. yield*
   1. Legacy generator function
   2. async function
   3. block
   4. break
   5. class
   6. const
   7. continue
   8. debugger
   9. default
   10. do. while
   11. empty
   12. export
   13. for
   14. for each. in
   15. for. in
   16. for. of
   17. function declaration
   18. function*
   19. if. else
   20. import
   21. label
   22. let
   23. return
   24. switch
   25. throw
   26. try. catch
   27. var
   28. while
   29. with
   1. Arguments object
   2. Arrow functions
   3. Default parameters
   4. Method definitions
   5. Rest parameters
   6. getter
   7. setter
   1. constructor
   2. extends
   3. static
   1. Error: Permission denied to access property «x»
   2. InternalError: too much recursion
   3. RangeError: argument is not a valid code point
   4. RangeError: invalid array length
   5. RangeError: invalid date
   6. RangeError: precision is out of range
   7. RangeError: radix must be an integer
   8. RangeError: repeat count must be less than infinity
   9. RangeError: repeat count must be non-negative
   10. ReferenceError: «x» is not defined
   11. ReferenceError: assignment to undeclared variable «x»
   12. ReferenceError: can’t access lexical declaration`X’ before initialization
   13. ReferenceError: deprecated caller or arguments usage
   14. ReferenceError: invalid assignment left-hand side
   15. ReferenceError: reference to undefined property «x»
   16. SyntaxError: «0»-prefixed octal literals and octal escape seq. are deprecated
   17. SyntaxError: «use strict» not allowed in function with non-simple parameters
   18. SyntaxError: «x» is a reserved identifier
   19. SyntaxError: JSON.parse: bad parsing
   20. SyntaxError: Malformed formal parameter
   21. SyntaxError: Unexpected token
   22. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
   23. SyntaxError: a declaration in the head of a for-of loop can’t have an initializer
   24. SyntaxError: applying the ‘delete’ operator to an unqualified name is deprecated
   25. SyntaxError: for-in loop head declarations may not have initializers
   26. SyntaxError: function statement requires a name
   27. SyntaxError: identifier starts immediately after numeric literal
   28. SyntaxError: illegal character
   29. SyntaxError: invalid regular expression flag «x»
   30. SyntaxError: missing ) after argument list
   31. SyntaxError: missing ) after condition
   32. SyntaxError: missing : after property id
   33. SyntaxError: missing ; before statement
   34. SyntaxError: missing = in const declaration
   35. SyntaxError: missing ] after element list
   36. SyntaxError: missing formal parameter
   37. SyntaxError: missing name after . operator
   38. SyntaxError: missing variable name
   39. SyntaxError: missing > after function body
   40. SyntaxError: missing > after property list
   41. SyntaxError: redeclaration of formal parameter «x»
   42. SyntaxError: return not in function
   43. SyntaxError: test for equality (==) mistyped as assignment (=)?
   44. SyntaxError: unterminated string literal
   45. TypeError: «x» has no properties
   46. TypeError: «x» is (not) «y»
   47. TypeError: «x» is not a constructor
   48. TypeError: «x» is not a function
   49. TypeError: «x» is not a non-null object
   50. TypeError: «x» is read-only
   51. TypeError: More arguments needed
   52. TypeError: can’t access dead object
   53. TypeError: can’t define property «x»: «obj» is not extensible
   54. TypeError: can’t delete non-configurable array element
   55. TypeError: can’t redefine non-configurable property «x»
   56. TypeError: cyclic object value
   57. TypeError: invalid ‘in’ operand «x»
   58. TypeError: invalid Array.prototype.sort argument
   59. TypeError: invalid arguments
   60. TypeError: invalid assignment to const «x»
   61. TypeError: property «x» is non-configurable and can’t be deleted
   62. TypeError: setting getter-only property «x»
   63. TypeError: variable «x» redeclares argument
   64. URIError: malformed URI sequence
   65. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
   66. Warning: 08/09 is not a legal ECMA-262 octal constant
   67. Warning: Date.prototype.toLocaleFormat is deprecated
   68. Warning: JavaScript 1.6’s for-each-in loops are deprecated
   69. Warning: String.x is deprecated; use String.prototype.x instead
   70. Warning: expression closures are deprecated
   71. Warning: unreachable code after return statement
   1. JavaScript technologies overview
   2. Lexical grammar
   3. JavaScript data structures
   4. Enumerability and ownership of properties
   5. Iteration protocols
   6. Strict mode
   7. Transitioning to strict mode
   8. Template literals
   9. Deprecated features
   1. ECMAScript 2015 support in Mozilla
   2. ECMAScript 5 support in Mozilla
   3. ECMAScript Next support in Mozilla
   4. Firefox JavaScript changelog
   5. New in JavaScript 1.1
   6. New in JavaScript 1.2
   7. New in JavaScript 1.3
   8. New in JavaScript 1.4
   9. New in JavaScript 1.5
   10. New in JavaScript 1.6
   11. New in JavaScript 1.7
   12. New in JavaScript 1.8
   13. New in JavaScript 1.8.1
   14. New in JavaScript 1.8.5
   1. All pages index
   2. Methods index
   3. Properties index
   4. Pages tagged «JavaScript»
   1. JavaScript doc status
   2. The MDN project

   Источник

   Standard built-in objects

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

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

   The global object itself can be accessed using the this operator in the global scope. In fact, the global scope consists of the properties of the global object, 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.

   For more information about the distinction between the DOM and core JavaScript, see JavaScript technologies overview.

   Standard objects by category

   Value properties

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

   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.

   Error objects

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

   Numbers and dates

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

   Text processing

   These objects represent strings and support manipulating them.

   Indexed collections

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

   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.

   Structured data

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

   Managing memory

   These objects interact with the garbage collection mechanism.

   Control abstraction objects

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

   Reflection

   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

   Found a content problem with this page?

   This page was last modified on Apr 22, 2023 by MDN contributors.

   Your blueprint for a better internet.

   Источник