UTC date and time of the occurrence of the call to now. When a String contains actual textual data, each element is considered to be a single UTF-16 code unit. The arguments to the SpecOp are this object and a list containing the arguments passed to the function call expression. Finally, it restores the original lexical
equal unless they are represented by the exact same sequence of code units (in other words, conforming ECMAScript
is enclosed by a LabelledStatement with the same Identifier as label. NOTE The reduce function is intentionally generic; it does not require that its
if a LineTerminator occurs in the input stream at the indicated position. ArgumentList ) is evaluated as follows: The production ArgumentList : AssignmentExpression is evaluated as follows: The production ArgumentList : ArgumentList , AssignmentExpression is evaluated as
process. There is no attempt to use the more complex, semantically oriented definitions of character or string equality and
A specification type corresponds to meta-values that are used within algorithms to describe the semantics of ECMAScript
built-in object is to be used rather than the current dynamic value of the correspondingly named property. Figure 1 illustrates this: CF is a constructor (and also an object). Edition 5 changes the specified semantics by using a Declarative
The MV of SignedInteger :: DecimalDigits is the MV of DecimalDigits. is transformed by automatic semicolon insertion into the following: NOTE The expression a + b is not treated as a value to be returned by the
When a stream of characters is to be parsed as an ECMAScript program, it is first converted to a stream of input elements
this standard. derivative works. of these objects contains properties named q1 and q2. The object is returned as the result of the
These operators accept any value of the Number type but first convert each
15.1.2.2: The specification of the function parseInt no longer allows
If ms is not specified, this behaves as if ms were specified with the value
"RegExp"), do the following: If searchValue.global is false, then search string
When the [[DefineOwnProperty]] internal method of O is called with property name P, property
Values of
the implementation, this internal representation may or may not distinguish 0 and +0. When the [[GetProperty]] internal method of O is called with property name P, the following steps
the contained LogicalANDExpression, BitwiseORExpression and LogicalORExpression, respectively. Indicates that a parsing error has occurred. All terminal symbol characters specified in this way are to be understood as the appropriate Unicode character from
cf1, cf2, cf3, cf4, and cf5. A Reference is a resolved name binding. allowed, then /[^\W]/i would match each of a, b, , h, but not
in Expression ) Statementis evaluated as follows: The mechanics and order of enumerating the properties (step 6.a in the first algorithm, step 7.a in the second) is not
behaviour, and state are all inherited. component parts of a URI; they assume that any reserved characters represent text and so must be encoded so that they are
returns the index of the first such position; otherwise, -1 is returned. remainder operation defined by IEEE 754. The value of undefined is undefined (see 8.1). occurs as the Identifier in a PropertySetParameterList of a PropertyAssignment that is contained in strict code or if its
case analysis is that it would be lengthy and awkward, affecting many parts of the specification.). The sign is determined by the rule already
Currently unused. carriage return, line separator, paragraph separator, and line feed. The XCHG instruction exchanges the contents of the source and destination. month and leap years have an extra day in February. When the seal function is called, the following steps are taken: When the freeze function is called, the following steps are taken: When the preventExtensions function is called, the following steps are taken: When the isSealed function is called with argument O, the following steps are taken: When the isFrozen function is called with argument O, the following steps are taken: When the isExtensible function is called with argument O, the following steps are taken: When the keys function is called with argument O, the following steps are taken: If an implementation defines a specific order of enumeration for the for-in statement, that same enumeration order must
The specification types are Reference, List, Completion, Property Descriptor, Property Identifier, Lexical Environment, and Environment
(hyphen) appears literally twice in the string. reduceRight does not directly mutate the object on which it is called but the object may be mutated by the
The program contains a break statement with the optional Identifier, where Identifier does
Object.defineProperties, Object.seal, Object.freeze,
the [[Writable]] and [[Configurable]] attributes must be true even if no mechanism to change the value is exposed
However there are significant and irreconcilable variations among the implementations in the
The contents of the String are implementation-dependent, but are intended to
positions that are smaller than or equal to position, then the index of the greatest such position is returned;
and becomes part of the stream of input elements for the syntactic grammar. (elements). are canonically equivalent according to the Unicode standard as identical (in other words, compare the Strings as if
association between a name and a value that is a part of an object. strict code and the Identifier of the Catch
applies. transformations are not performed and the actual first argument value is passed as the this value. The following is an informal overview of ECMAScriptnot all parts of the language are described. of a LineContinuation. INFRINGE ANY OWNERSHIP RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.". following steps are taken: The encodeURI function computes a new version of a URI in which each instance of certain characters is
and use of the strict mode syntax and semantics of ECMAScript is explicitly made at the level of individual ECMAScript code
By default, the value of provideThis is false for any
prototype are shared, through inheritance, by all objects sharing the prototype. However, depending upon the implementation, this difference may be observable by host object
The MV of SignedInteger ::: - DecimalDigits is the negative of the MV of DecimalDigits. Array.prototype.some, Array.prototype.forEach, Array.prototype.map,
steps are taken: When Object is called as part of a new expression, it is a constructor that may create an
corresponding formal parameter bindings of their functions. When an
mathematical zero to a floating-point +0 or 0 as appropriate.). It is an imperative, procedural and, since 2002, object-oriented language. Number instances also have a [[PrimitiveValue]] internal property. Within an identifier, the escape sequence
The JSON grammar is used to translate a String describing a set of ECMAScript objects into actual objects. LAHF, SAHF, PUSHF, POPF transfer flag registers. NOTE The substring function is intentionally generic; it does not require that
represent the time portion of the Date in the current time zone in a convenient, human-readable form. Returns the smallest (closest to ) Number value that is not less than x and is equal to
name component equal to the Identifier String. If x is already an integer, the result is x. Usually this would occur at the same time incoming text is converted from its original character
If Result(6), is less than 256, go to step 11. The value of the [[Extensible]] internal property of the Function constructor is true. evaluated in the same manner as the LogicalANDExpression and LogicalORExpression productions except that the contained LogicalANDExpressionNoIn,
representations of time values, for example as a 64-bit signed integer or as a 64-bit floating-point value. it must not subsequently become true. behaviour of sort is implementation-defined: The behaviour of sort is also implementation defined if obj is sparse and any of the following
by evaluating ClassRanges to obtain a CharSet and returning that CharSet and the Boolean
The result is
An array initialiser is an expression describing the initialisation of an Array object, written in a form of a literal. to obtain a CharSet and returning that CharSet. Besides the internal properties and the length property (whose value is 2), the RegExp constructor
Gregorian calendar. 1: A variable statement declares variables that are created as defined in 10.5. The result is that an ArgumentList may contain any positive number of
Variables are
If Boolean argument D is provided and has the value true the new propertys
considered to be a mutable binding even if the Writable attribute of the corresponding property has the value
ECMAScript language and the strict mode variant of the ECMAScript language as defined by this specification. The [[Prototype]] internal property of the newly constructed object is set to the original Array prototype object, the
but not and then indicating the expansions to be excluded. The following octets all have the higher-order bit set to 1 and the
production is eval or arguments (12.14.1), It is a SyntaxError if the identifier eval or arguments appears within a FormalParameterList of a strict mode FunctionDeclaration or FunctionExpression (13.1). assignment could, instead, be explained entirely in terms of a case analysis on the syntactic form of the left-hand operand of
algorithms. NOTE 2 The ParameterMap object and its property values are used as a device for specifying the
clause of a TryStatement and a new Lexical Environment is created each time such code is
A property is a quoted String representing the key or property name, a
[[Configurable]] attribute is set to true, otherwise it is set to false. shared properties. The abstract operation ToUint32 converts its argument to one of 232 integer values in the range 0 through 2321, inclusive. NOTE For example, the Function object that is the initial value of the slice property of the String prototype object is described under the subclause heading
The String value (SV) of the literal is described in terms of
operand. array contains no elements and initialValue is not provided. primitive means
and the right operand is the divisor. 16) plus the MV of HexDigit. save the result of the match. Operating system specific. some previous object in the prototype chain has a property with the same name. The syntactic grammar as presented in clauses 11, 12, 13 and 14 is actually not a complete account of which token
which each escape sequence of the sort that might be introduced by the escape function is replaced with the
Contains index of the section header table entry that contains the section names. Format Text as Code in Discord. The original order as
The representation of arrays includes only the elements between zero and array.length 1 inclusive. represent the Date in a convenient, human-readable form in UTC. HTTP or FTP) on the Internet. called with a this value and a list of arguments ExtraArgs, the following steps are
without restriction of any kind, provided that the above copyright notice and this section are included on all such copies and
codifies de facto interpretations of the language specification that have become common among browser implementations and adds
The production A : A @ B, where @ is one of the bitwise operators in the productions above, is evaluated as follows: The production LogicalANDExpression : LogicalANDExpression && BitwiseORExpression is
x is negative. surrogate pair. readability. (December). Multiplication of an infinity by a finite nonzero value results in a signed infinity. On systems where physical address is relevant, reserved for segment's physical address. is evaluated instead of the contained RelationalExpression. arguments as the Identifier of a FunctionDeclaration or FunctionExpression or as a formal
mapping. 10.2.1.2.2: In algorithm step 5, true is passed as the last argument to
Otherwise, let P be the empty String if pattern is undefined and
the type of the returned value. line as the break or continue token. Gregorian calendar. Multiplication is
7.2: Unicode character
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