Novedades en JavaScript

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Este capítulo contiene información del historial de versiones de JavaScript y su estatus de implementación en aplicaciones basadas en JavaScript de Mozilla/SpiderMonkey (como Firefox)

Versiones ECMAScript

Recursos del Lenguaje
Aprende más acerca de los estándares ECMAscript en los que el lenguaje JavaScript está basado.
Soporte ECMAScript 5
Estatus de la implementación del estandar actual ECMA-262 (Edición 5.1) en aquellos productos y sistemas basados en Mozilla.
Soporte ECMAScript 6
Estatus de la implementación del estandar en proceso de incorporación ECMA-262 (Edición 6) en aquellos productos y sistemas basados en Mozilla.
Soporte ECMAScript 7
Estatus de la implementación del estandar próximo ECMA-262 (Edición 7) en aquellos productos y sistemas basados en Mozilla.

Notas de Lanzamiento de JavaScript

Bitácora de cambios (changelog) de JavaScript en Firefox
Vea esta bitácora de cambios (changelog) para mayor información de las características y funcionalidades implementadas a partir de Firefox 5.
Bitácora de Cambios (Changelog) de JavaScript en Chrome
(PENDIENTE) Vea esta bitácora de cambios (changelog) para mayor información de las características y funcionalidades implementadas en Chrome.

Versiones JavaScript

Deprecated ( ). The explicit versioning and opt-in of language features was Mozilla-specific and is in process of being removed. Firefox 4 was the last version which referred to an JavaScript version (1.8.5). With new ECMA standards, JavaScript language features are now often mentioned with their initial definition in ECMA-262 Editions such as Edition 6 (ES6).

JavaScript was released as version 1.0 in March 1996 in Netscape Navigator 2.0 and Internet Explorer 2.0.

JavaScript 1.1
Version shipped in Netscape Navigator 3.0. Released on August 19, 1996.
JavaScript 1.2
Version shipped in Netscape Navigator 4.0-4.05. Released on June 11, 1997.
JavaScript 1.3
Version shipped in Netscape Navigator 4.06-4.7x. Released on October 19, 1998.
Standardization work to be compliant with ECMA-262 1st and 2nd Edition.
JavaScript 1.4
Version shipped in Netscape's server side JavaScript. Released in 1999.
JavaScript 1.5
Version shipped in Netscape Navigator 6.0 and Firefox 1.0. Release on November 14, 2000.
Standardization work to be compliant with ECMA-262 3rd Edition.
JavaScript 1.6
Version shipped in Firefox 1.5. Released in November 2005.
Includes ECMAScript for XML (E4X), new Array methods plus String and Array generics.
JavaScript 1.7
Version shipped in Firefox 2. Released in October 2006.
Includes generators, iterators, array comprehensions, let expressions, and destructuring assignment.
JavaScript 1.8
Version shipped in Firefox 3. Released in June 2008.
Includes expression closures, generator expressions and Array.reduce()
JavaScript 1.8.1
Version shipped in Firefox 3.5. Released on June 30, 2009.
Includes the TraceMonkey JIT and supports native JSON.
JavaScript 1.8.2
Version shipped in Firefox 3.6. Released June 22, 2009.
Includes only minor changes.
JavaScript 1.8.5
Version shipped in Firefox 4. Released July 27, 2010.
Includes many new features for ECMA-262 Edition 5 compliance.
This is the last JavaScript version.

Features still requiring version opt-in

let statement
The let statement requires the JavaScript version 1.7 (or higher) opt-in. See error 932517 and error 932517.
Temas relacionados
  1. JavaScript
  2. Tutorials:
  3. Complete beginners
    1. JavaScript basics
    2. JavaScript first steps
    3. JavaScript building blocks
    4. Introducing JavaScript objects
  4. JavaScript Guide
    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. Using promises
    15. Iterators and generators
    16. Meta programming
    17. JavaScript modules
  5. Intermediate
    1. Introducing JavaScript objects
    2. Client-side web APIs
    3. A re-introduction to JavaScript
    4. JavaScript data structures
    5. Equality comparisons and sameness
    6. Closures
  6. Advanced
    1. Inheritance and the prototype chain
    2. Strict mode
    3. JavaScript typed arrays
    4. Memory Management
    5. Concurrency model and Event Loop
  7. References:
  8. Built-in objects
    1. AggregateError [Traducir]
    2. Array
    3. ArrayBuffer
    4. Funciones asíncronas
    5. AsyncIterator [Traducir]
    6. Atomics [Traducir]
    7. BigInt [Traducir]
    8. BigInt64Array [Traducir]
    9. BigUint64Array [Traducir]
    10. Boolean
    11. DataView
    12. Date
    13. Error
    14. EvalError
    15. Float32Array [Traducir]
    16. Float64Array [Traducir]
    17. Function
    18. Generador
    19. GeneratorFunction [Traducir]
    20. Infinity
    21. Int16Array [Traducir]
    22. Int32Array [Traducir]
    23. Int8Array [Traducir]
    24. InternalError [Traducir]
    25. Intl
    26. Intl.Collator [Traducir]
    27. Intl.DateTimeFormat [Traducir]
    28. Intl.DisplayNames [Traducir]
    29. Intl.ListFormat [Traducir]
    30. Intl.Locale [Traducir]
    31. Intl.NumberFormat
    32. Intl.PluralRules [Traducir]
    33. Intl.RelativeTimeFormat [Traducir]
    34. Iterator [Traducir]
    35. JSON
    36. Map
    37. Math
    38. NaN
    39. Number
    40. Object
    41. Promise
    42. Proxy
    43. RangeError
    44. ReferenceError [Traducir]
    45. Reflect
    46. RegExp
    47. Set
    48. SharedArrayBuffer [Traducir]
    49. String
    50. Symbol
    51. SyntaxError
    52. TypeError
    53. TypedArray
    54. URIError
    55. Uint16Array [Traducir]
    56. Uint32Array [Traducir]
    57. Uint8Array
    58. Uint8ClampedArray [Traducir]
    59. WeakMap
    60. WeakSet
    61. WebAssembly
    62. decodeURI()
    63. decodeURIComponent
    64. encodeURI
    65. encodeURIComponent
    66. escape()
    67. eval
    68. globalThis [Traducir]
    69. isFinite()
    70. isNaN
    71. null
    72. parseFloat
    73. parseInt()
    74. undefined
    75. unescape()
    76. uneval() [Traducir]
  9. Expressions & operators
    1. Operadores Aritméticos
    2. Comprensiones de arreglo
    3. Operadores de asignación
    4. Operadores a nivel de bit
    5. Operador Coma
    6. Operadores de Comparación
    7. Operador condicional (ternario)
    8. Asignación por destructuring
    9. Expression closures
    10. function
    11. Generator comprehensions [Traducir]
    12. Operador de agrupación
    13. Legacy generator function expression [Traducir]
    14. Operadores lógicos
    15. Nullish coalescing operator [Traducir]
    16. Object initializer [Traducir]
    17. Precedencia de operadores
    18. Optional chaining [Traducir]
    19. Operador Pipeline
    20. Miembros
    21. Sintáxis Spread
    22. Expresión de función asíncrona
    23. await
    24. expresión class
    25. operador delete
    26. expresión function*
    27. in
    28. instanceof
    29. new
    30. new.target
    31. super
    32. this
    33. typeof
    34. void
    35. yield
    36. yield*
  10. Statements & declarations
    1. Función generadora de legado
    2. Función async
    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 await...of
    15. for each...in
    16. for...in
    17. for...of
    18. function
    19. function*
    20. if...else
    21. import
    22. import.meta [Traducir]
    23. label
    24. let
    25. return
    26. switch
    27. throw
    28. try...catch
    29. var
    30. while
    31. with
  11. Functions
    1. Funciones Flecha
    2. Parámetros por defecto
    3. Method definitions
    4. Parámetros Rest
    5. Objeto arguments
    6. get
    7. setter
  12. Classes
    1. Class fields
    2. constructor
    3. extends
    4. static
  13. Errors
    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 [Traducir]
    7. RangeError: radix must be an integer [Traducir]
    8. RangeError: repeat count must be less than infinity [Traducir]
    9. RangeError: repeat count must be non-negative [Traducir]
    10. ReferenceError: "x" is not defined
    11. ReferenceError: assignment to undeclared variable "x" [Traducir]
    12. ReferenceError: can't access lexical declaration`X' before initialization [Traducir]
    13. ReferenceError: deprecated caller or arguments usage [Traducir]
    14. ReferenceError: invalid assignment left-hand side [Traducir]
    15. ReferenceError: reference to undefined property "x"
    16. SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated [Traducir]
    17. SyntaxError: "use strict" not allowed in function with non-simple parameters [Traducir]
    18. SyntaxError: "x" is a reserved identifier [Traducir]
    19. SyntaxError: JSON.parse: bad parsing [Traducir]
    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 [Traducir]
    24. SyntaxError: applying the 'delete' operator to an unqualified name is deprecated [Traducir]
    25. SyntaxError: for-in loop head declarations may not have initializers [Traducir]
    26. SyntaxError: function statement requires a name [Traducir]
    27. SyntaxError: identifier starts immediately after numeric literal [Traducir]
    28. ErrorDeSintaxis: Caracter ilegal
    29. SyntaxError: invalid regular expression flag "x" [Traducir]
    30. SyntaxError: missing ) after argument list
    31. SyntaxError: missing ) after condition [Traducir]
    32. SyntaxError: missing : after property id [Traducir]
    33. ErrordeSintaxis: Punto y coma ; faltante antes de la declaracion
    34. SyntaxError: missing = in const declaration [Traducir]
    35. SyntaxError: missing ] after element list [Traducir]
    36. SyntaxError: missing formal parameter
    37. SyntaxError: missing name after . operator [Traducir]
    38. SyntaxError: missing variable name
    39. SyntaxError: missing } after function body [Traducir]
    40. SyntaxError: missing } after property list
    41. SyntaxError: redeclaration of formal parameter "x" [Traducir]
    42. SyntaxError: return not in function [Traducir]
    43. SyntaxError: test for equality (==) mistyped as assignment (=)? [Traducir]
    44. SyntaxError: unterminated string literal [Traducir]
    45. TypeError: "x" has no properties [Traducir]
    46. TypeError: "x" is (not) "y"
    47. TypeError: "x" is not a constructor [Traducir]
    48. TypeError: "x" is not a function
    49. TypeError: "x" is not a non-null object [Traducir]
    50. TypeError: "x" is read-only [Traducir]
    51. TypeError: 'x' is not iterable [Traducir]
    52. TypeError: More arguments needed
    53. TypeError: Reduce of empty array with no initial value [Traducir]
    54. TypeError: X.prototype.y called on incompatible type [Traducir]
    55. TypeError: can't access dead object [Traducir]
    56. TypeError: can't access property "x" of "y" [Traducir]
    57. TypeError: can't assign to property "x" on "y": not an object [Traducir]
    58. TypeError: can't define property "x": "obj" is not extensible [Traducir]
    59. TypeError: can't delete non-configurable array element [Traducir]
    60. TypeError: can't redefine non-configurable property "x" [Traducir]
    61. TypeError: cannot use 'in' operator to search for 'x' in 'y'
    62. TypeError: cyclic object value [Traducir]
    63. TypeError: invalid 'instanceof' operand 'x' [Traducir]
    64. TypeError: invalid Array.prototype.sort argument [Traducir]
    65. TypeError: invalid arguments [Traducir]
    66. TypeError: invalid assignment to const "x" [Traducir]
    67. TypeError: property "x" is non-configurable and can't be deleted [Traducir]
    68. TypeError: setting getter-only property "x" [Traducir]
    69. TypeError: variable "x" redeclares argument [Traducir]
    70. URIError: malformed URI sequence [Traducir]
    71. Warning: -file- is being assigned a //# sourceMappingURL, but already has one [Traducir]
    72. SyntaxError: "x" is not a legal ECMA-262 octal constant
    73. Warning: Date.prototype.toLocaleFormat is deprecated [Traducir]
    74. Warning: JavaScript 1.6's for-each-in loops are deprecated [Traducir]
    75. Warning: String.x is deprecated; use String.prototype.x instead [Traducir]
    76. Warning: expression closures are deprecated [Traducir]
    77. Advertencia: codigo inaccesible despues de sentencia de retorno
  14. Misc
    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