11/8/2023 0 Comments Mdn javascript versionsTypeError: can't delete non-configurable array element.TypeError: can't define property "x": "obj" is not extensible.TypeError: "x" is not a non-null object.Synta圎rror: unterminated string literal.Synta圎rror: test for equality (=) mistyped as assignment (=)?.Synta圎rror: redeclaration of formal parameter "x".Synta圎rror: missing } after property list.Synta圎rror: missing } after function body.Synta圎rror: missing ] after element list.Synta圎rror: missing = in const declaration.Synta圎rror: missing : after property id.Synta圎rror: missing ) after argument list.Synta圎rror: invalid regular expression flag "x".Synta圎rror: identifier starts immediately after numeric literal.Synta圎rror: function statement requires a name.Synta圎rror: for-in loop head declarations may not have initializers.Synta圎rror: applying the 'delete' operator to an unqualified name is deprecated.Synta圎rror: a declaration in the head of a for-of loop can't have an initializer.Synta圎rror: Using to indicate sourceURL pragmas is deprecated.Synta圎rror: Malformed formal parameter.Synta圎rror: "x" is a reserved identifier.Synta圎rror: "use strict" not allowed in function with non-simple parameters.Synta圎rror: "0"-prefixed octal literals and octal escape seq.ReferenceError: reference to undefined property "x".ReferenceError: invalid assignment left-hand side.ReferenceError: deprecated caller or arguments usage.ReferenceError: assignment to undeclared variable "x".RangeError: repeat count must be non-negative.RangeError: repeat count must be less than infinity.RangeError: argument is not a valid code point.Error: Permission denied to access property "x".Includes many new features for ECMA-262 Edition 5 compliance. JavaScript 1.8.5 Version shipped in Firefox 4. JavaScript 1.8.2 Version shipped in Firefox 3.6. Includes the TraceMonkey JIT and supports native JSON. Includes expression closures, generator expressions and Array.reduce() JavaScript 1.8.1 Version shipped in Firefox 3.5. JavaScript 1.8 Version shipped in Firefox 3. Includes generators, iterators, array comprehensions, let expressions, and destructuring assignment. JavaScript 1.7 Version shipped in Firefox 2. Includes ECMAScript for XML (E4X), new Array methods plus String and Array generics. JavaScript 1.6 Version shipped in Firefox 1.5. Standardization work to be compliant with ECMA-262 3rd Edition. JavaScript 1.5 Version shipped in Netscape Navigator 6.0 and Firefox 1.0. JavaScript 1.4 Version shipped in Netscape's server side JavaScript. Standardization work to be compliant with ECMA-262 1st and 2nd Edition. JavaScript 1.3 Version shipped in Netscape Navigator 4.06-4.7x. JavaScript 1.2 Version shipped in Netscape Navigator 4.0-4.05. ![]() JavaScript 1.1 Version shipped in Netscape Navigator 3.0. JavaScript was released as version 1.0 in March 1996 in Netscape Navigator 2.0 and Internet Explorer 2.0. With new ECMA standards, JavaScript language features are now often mentioned with their initial definition in ECMA-262 Editions such as ECMAScript 2015. Firefox 4 was the last version which referred to an JavaScript version (1.8.5). The explicit versioning and opt-in of language features was Mozilla-specific and is in process of being removed. JavaScript release notes Firefox JavaScript changelog See this changelog for JavaScript features implemented in Firefox 5 and later. ECMAScript Next support Implementation status for upcoming ECMA-262 features as per the yearly (ES2016/ES2017/ES2018/.) release schedule in Mozilla-based engines and products. ECMAScript 2015 support Implementation status for the draft ECMA-262 Edition 6 (ES2015) in Mozilla-based engines and products. ECMAScript 5 support Implementation status for the current standard ECMA-262 Edition 5.1 in Mozilla-based engines and products. ![]() ECMAScript versions Language resources Learn more about the ECMAScript standards on which the JavaScript language is based on. This chapter contains information about JavaScript's version history and implementation status for Mozilla/SpiderMonkey-based JavaScript applications, such as Firefox.
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