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Head over to our Learning Area JavaScript topic if you want to learn JavaScript but have no previous experience with JavaScript or programming. However, the two programming languages have very different syntax, semantics, and use. Both 'Java' and 'JavaScript' are trademarks or registered trademarks of Oracle in the U.S. Most of the time, this happens between the stages 3 and 4, and is usually before the spec is officially published.ĭo not confuse JavaScript with the Java programming language. This means that cases where some proposals for new ECMAScript features have already been implemented in browsers, documentation and examples in MDN articles may use some of those new features. As soon as one browser implements a feature, we try to document it. The standards for JavaScript are the ECMAScript Language Specification (ECMA-262) and the ECMAScript Internationalization API specification (ECMA-402). For information about APIs that are specific to Web pages, please see Web APIs and DOM. This section is dedicated to the JavaScript language itself, and not the parts that are specific to Web pages or other host environments. JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript ( JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions.

Enumerability and ownership of properties.

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Warning: unreachable code after return statement.

Warning: String.x is deprecated use instead.

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'.

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