![]() Warning: expression closures are deprecated.Warning: 08/09 is not a legal ECMA-262 octal constant.Warning: -file- is being assigned a //# sourceMappingURL, but already has one.TypeError: X.prototype.y called on incompatible type.TypeError: setting getter-only property "x".TypeError: Reduce of empty array with no initial value.TypeError: property "x" is non-configurable and can't be deleted.TypeError: invalid assignment to const "x".TypeError: invalid 'instanceof' operand 'x'.TypeError: cannot use 'in' operator to search for 'x' in 'y'.TypeError: can't redefine non-configurable property "x".TypeError: can't delete non-configurable array element.TypeError: can't define property "x": "obj" is not extensible.TypeError: can't convert BigInt to number.TypeError: can't assign to property "x" on "y": not an object.TypeError: "x" is not a non-null object.Synta圎rror: Using to indicate sourceURL pragmas is deprecated.Synta圎rror: unterminated string literal.Synta圎rror: unparenthesized unary expression can't appear on the left-hand side of '**'.Synta圎rror: Unexpected '#' used outside of class body.Synta圎rror: test for equality (=) mistyped as assignment (=)?.Synta圎rror: redeclaration of formal parameter "x".Synta圎rror: missing = in const declaration.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 ) after argument list.Synta圎rror: missing : after property id.Synta圎rror: Malformed formal parameter.Synta圎rror: invalid regular expression flag "x".Synta圎rror: invalid assignment left-hand side.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: cannot use `?` unparenthesized within `||` and `&` expressions.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: "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: deprecated caller or arguments usage. ![]() ReferenceError: can't access lexical declaration 'X' before initialization.ReferenceError: assignment to undeclared variable "x".RangeError: x can't be converted to BigInt because it isn't an integer.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".Enumerability and ownership of properties.Usually, implementations start bringing in new features of ECMAScript bit-by-bit. It is uncommon for new features to be implemented as a whole. We just worry about runtime environments and what they support. Today, we don't really worry about JavaScript versions any more. It's like asking for "Kleenex", when you really just mean tissue. Knowing all this, in casual conversation (and sometimes not so casual), people say "JavaScript" when they actually should be saying "ECMAScript". That language (ECMAScript) has also had revisions over the years and those revisions come with version numbers. However, many years ago, Netscape wanted "JavaScript" to be recognized as the official scripting language of the web and so they approached the "European Computer Manufacturer's Association" (ECMA) to produce a specification that detailed the "official" language. Today, JavaScript is maintained by the Mozilla Organization and they continue to evolve the language and track that evolution via version numbers. These revisions are tracked with version numbers. It was created by Netscape in the early 1990's and, as with all languages, has had revisions over the years. "JavaScript" is a proprietary brand name for an implementation of a scripting language.
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