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Copy file name to clipboardExpand all lines: spec/collator.html
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<dd>
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The returned Number represents the result of an implementation-defined locale-sensitive String comparison of _x_ with _y_.
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The result is intended to correspond with a sort order of String values according to the effective locale and collation options of _collator_, and will be negative when _x_ is ordered before _y_, positive when _x_ is ordered after _y_, and zero in all other cases (representing no relative ordering between _x_ and _y_).
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String values must be interpreted as UTF-16 code unit sequences as described in es2024, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>, and a surrogate pair (a code unit in the range 0xD800 to 0xDBFF followed by a code unit in the range 0xDC00 to 0xDFFF) within a string must be interpreted as the corresponding code point.
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String values must be interpreted as UTF-16 code unit sequences as described in es2025, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>, and a surrogate pair (a code unit in the range 0xD800 to 0xDBFF followed by a code unit in the range 0xDC00 to 0xDFFF) within a string must be interpreted as the corresponding code point.
Copy file name to clipboardExpand all lines: spec/conformance.html
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<emu-clauseid="conformance">
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<h1>Conformance</h1>
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<p>
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A conforming implementation of this specification must conform to the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition, or successor), and must provide and support all the objects, properties, functions, and program semantics described in this specification. Nothing in this specification is intended to allow behaviour that is otherwise prohibited by ECMA-262, and any such conflict should be considered an editorial error rather than an override of constraints from ECMA-262.
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A conforming implementation of this specification must conform to the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition, or successor), and must provide and support all the objects, properties, functions, and program semantics described in this specification. Nothing in this specification is intended to allow behaviour that is otherwise prohibited by ECMA-262, and any such conflict should be considered an editorial error rather than an override of constraints from ECMA-262.
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</p>
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A conforming implementation is permitted to provide additional objects, properties, and functions beyond those described in this specification. In particular, a conforming implementation is permitted to provide properties not described in this specification, and values for those properties, for objects that are described herein. A conforming implementation is not permitted to add optional arguments to the functions defined in this specification.
Copy file name to clipboardExpand all lines: spec/conventions.html
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<h1>Notational Conventions</h1>
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<p>
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This standard uses a subset of the notational conventions of the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition), as es2024:
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This standard uses a subset of the notational conventions of the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition), as es2025:
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</p>
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<ul>
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<li>Object Internal Methods and Internal Slots, as described in es2024, <emu-xrefhref="#sec-object-internal-methods-and-internal-slots"></emu-xref>.</li>
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<li>Algorithm conventions, as described in es2024, <emu-xrefhref="#sec-algorithm-conventions"></emu-xref>, and the use of abstract operations, as described in es2024, <emu-xrefhref="#sec-type-conversion"></emu-xref>, <emu-xrefhref="#sec-testing-and-comparison-operations"></emu-xref>, <emu-xrefhref="#sec-operations-on-objects"></emu-xref>, <emu-xrefhref="#sec-operations-on-iterator-objects"></emu-xref>.</li>
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<li>Internal Slots, as described in es2024, <emu-xrefhref="#sec-ordinary-object-internal-methods-and-internal-slots"></emu-xref>.</li>
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<li>The List and Record Specification Type, as described in es2024, <emu-xrefhref="#sec-list-and-record-specification-type"></emu-xref>.</li>
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<li>Object Internal Methods and Internal Slots, as described in es2025, <emu-xrefhref="#sec-object-internal-methods-and-internal-slots"></emu-xref>.</li>
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<li>Algorithm conventions, as described in es2025, <emu-xrefhref="#sec-algorithm-conventions"></emu-xref>, and the use of abstract operations, as described in es2025, <emu-xrefhref="#sec-type-conversion"></emu-xref>, <emu-xrefhref="#sec-testing-and-comparison-operations"></emu-xref>, <emu-xrefhref="#sec-operations-on-objects"></emu-xref>, <emu-xrefhref="#sec-operations-on-iterator-objects"></emu-xref>.</li>
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<li>Internal Slots, as described in es2025, <emu-xrefhref="#sec-ordinary-object-internal-methods-and-internal-slots"></emu-xref>.</li>
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<li>The List and Record Specification Type, as described in es2025, <emu-xrefhref="#sec-list-and-record-specification-type"></emu-xref>.</li>
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</ul>
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<emu-note>
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<h1>Well-Known Intrinsic Objects</h1>
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<p>
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The following table extends the Well-Known Intrinsic Objects table defined in es2024, <emu-xrefhref="#sec-well-known-intrinsic-objects"></emu-xref>.
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The following table extends the Well-Known Intrinsic Objects table defined in es2025, <emu-xrefhref="#sec-well-known-intrinsic-objects"></emu-xref>.
Copy file name to clipboardExpand all lines: spec/datetimeformat.html
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</h1>
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<dlclass="header">
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<dt>description</dt>
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<dd>It interprets _x_ as a time value as specified in es2024, <emu-xrefhref="#sec-time-values-and-time-range"></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of _dateTimeFormat_.</dd>
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<dd>It interprets _x_ as a time value as specified in es2025, <emu-xrefhref="#sec-time-values-and-time-range"></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of _dateTimeFormat_.</dd>
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1. Let _x_ be TimeClip(_x_).
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</h1>
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<dt>description</dt>
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<dd>It interprets _x_ and _y_ as time values as specified in es2024, <emu-xrefhref="#sec-time-values-and-time-range"></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of _dateTimeFormat_.</dd>
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<dd>It interprets _x_ and _y_ as time values as specified in es2025, <emu-xrefhref="#sec-time-values-and-time-range"></emu-xref>, and creates the corresponding parts according to the effective locale and the formatting options of _dateTimeFormat_.</dd>
Copy file name to clipboardExpand all lines: spec/introduction.html
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This specification's source can be found at <ahref="https://github.com/tc39/ecma402">https://github.com/tc39/ecma402</a>.
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The ECMAScript 2024 Internationalization API Specification (ECMA-402 11<sup>th</sup> Edition), provides key language sensitive functionality as a complement to the ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition or successor). Its functionality has been selected from that of well-established internationalization APIs such as those of the <dfnid="icu">Internationalization Components for Unicode (ICU) library</dfn> (<ahref="https://unicode-org.github.io/icu-docs/">https://unicode-org.github.io/icu-docs/</a>), of the .NET framework, or of the Java platform.
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The ECMAScript 2025 Internationalization API Specification (ECMA-402 12<sup>th</sup> Edition), provides key language sensitive functionality as a complement to the ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition or successor). Its functionality has been selected from that of well-established internationalization APIs such as those of the <dfnid="icu">Internationalization Components for Unicode (ICU) library</dfn> (<ahref="https://unicode-org.github.io/icu-docs/">https://unicode-org.github.io/icu-docs/</a>), of the .NET framework, or of the Java platform.
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The 1<sup>st</sup> Edition API was developed by an ad-hoc group established by Ecma TC39 in September 2010 based on a proposal by Nebojša Ćirić and Jungshik Shin.
This definition supersedes the definition provided in es2024, <emu-xrefhref="#sec-string.prototype.tolocalelowercase"></emu-xref>.
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This definition supersedes the definition provided in es2025, <emu-xrefhref="#sec-string.prototype.tolocalelowercase"></emu-xref>.
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</p>
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<p>
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This function interprets a String value as a sequence of code points, as described in es2024, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>. The following steps are taken:
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This function interprets a String value as a sequence of code points, as described in es2025, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>. The following steps are taken:
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</p>
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</h1>
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<dt>description</dt>
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<dd>It interprets _S_ as a sequence of UTF-16 encoded code points, as described in es2024, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>, and returns the result of ILD transformation into _targetCase_ as a new String value.</dd>
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<dd>It interprets _S_ as a sequence of UTF-16 encoded code points, as described in es2025, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>, and returns the result of ILD transformation into _targetCase_ as a new String value.</dd>
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</dl>
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1. Let _requestedLocales_ be ? CanonicalizeLocaleList(_locales_).
This definition supersedes the definition provided in es2024, <emu-xrefhref="#sec-string.prototype.tolocaleuppercase"></emu-xref>.
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This definition supersedes the definition provided in es2025, <emu-xrefhref="#sec-string.prototype.tolocaleuppercase"></emu-xref>.
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</p>
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This function interprets a String value as a sequence of code points, as described in es2024, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>. The following steps are taken:
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This function interprets a String value as a sequence of code points, as described in es2025, <emu-xrefhref="#sec-ecmascript-language-types-string-type"></emu-xref>. The following steps are taken:
<h1>Properties of the Number Prototype Object</h1>
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The following definition(s) refer to the abstract operation thisNumberValue as defined in es2024, <emu-xrefhref="#sec-properties-of-the-number-prototype-object"></emu-xref>.
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The following definition(s) refer to the abstract operation thisNumberValue as defined in es2025, <emu-xrefhref="#sec-properties-of-the-number-prototype-object"></emu-xref>.
<h1>Properties of the BigInt Prototype Object</h1>
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The following definition(s) refer to the abstract operation thisBigIntValue as defined in es2024, <emu-xrefhref="#sec-properties-of-the-bigint-prototype-object"></emu-xref>.
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The following definition(s) refer to the abstract operation thisBigIntValue as defined in es2025, <emu-xrefhref="#sec-properties-of-the-bigint-prototype-object"></emu-xref>.
The following definition(s) refer to the abstract operation thisTimeValue as defined in es2024, <emu-xrefhref="#sec-properties-of-the-date-prototype-object"></emu-xref>.
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The following definition(s) refer to the abstract operation thisTimeValue as defined in es2025, <emu-xrefhref="#sec-properties-of-the-date-prototype-object"></emu-xref>.
This algorithm's steps mirror the steps taken in es2024, <emu-xrefhref="#sec-array.prototype.tolocalestring"></emu-xref>, with the exception that Invoke(_nextElement_, *"toLocaleString"*) now takes _locales_ and _options_ as arguments.
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This algorithm's steps mirror the steps taken in es2025, <emu-xrefhref="#sec-array.prototype.tolocalestring"></emu-xref>, with the exception that Invoke(_nextElement_, *"toLocaleString"*) now takes _locales_ and _options_ as arguments.
Throughout this document, the phrase “es2024, _x_” (where x is a sequence of numbers separated by periods) may be used as shorthand for "ECMAScript 2024 Language Specification (ECMA-262 15<sup>th</sup> Edition, sub clause _x_)". Where _x_ is followed by more such sequences of period-separated numbers, separated from each other by commas, each such sequence is also a shorthand for the corresponding sub clause of ECMA-262.
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Throughout this document, the phrase “es2025, _x_” (where x is a sequence of numbers separated by periods) may be used as shorthand for "ECMAScript 2025 Language Specification (ECMA-262 16<sup>th</sup> Edition, sub clause _x_)". Where _x_ is followed by more such sequences of period-separated numbers, separated from each other by commas, each such sequence is also a shorthand for the corresponding sub clause of ECMA-262.
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