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class="item-toggle">+</span><a href="#overview" title="Overview"><span class="secnum">4</span> Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internationalization-localization-globalization" title="Internationalization, Localization, and Globalization"><span class="secnum">4.1</span> Internationalization, Localization, and Globalization</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-overview" title="API Overview"><span class="secnum">4.2</span> API Overview</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-conventions" title="API Conventions"><span class="secnum">4.3</span> API Conventions</a></li><li><span class="item-toggle">+</span><a href="#sec-implementation-dependencies" title="Implementation Dependencies"><span class="secnum">4.4</span> Implementation Dependencies</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-compatibility" title="Compatibility across implementations"><span class="secnum">4.4.1</span> Compatibility across implementations</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#conventions" title="Notational Conventions"><span class="secnum">5</span> Notational Conventions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-402-well-known-intrinsic-objects" title="Well-Known Intrinsic Objects"><span class="secnum">5.1</span> Well-Known Intrinsic Objects</a></li></ol></li><li><span class="item-toggle">+</span><a href="#locales-currencies-tz" title="Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars"><span class="secnum">6</span> Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-case-sensitivity-and-case-mapping" title="Case Sensitivity and Case Mapping"><span class="secnum">6.1</span> Case Sensitivity and Case Mapping</a></li><li><span class="item-toggle">+</span><a href="#sec-language-tags" title="Language Tags"><span class="secnum">6.2</span> Language Tags</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-isstructurallyvalidlanguagetag" title="IsStructurallyValidLanguageTag ( locale )"><span class="secnum">6.2.1</span> IsStructurallyValidLanguageTag ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeunicodelocaleid" title="CanonicalizeUnicodeLocaleId ( locale )"><span class="secnum">6.2.2</span> CanonicalizeUnicodeLocaleId ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultlocale" title="DefaultLocale ( )"><span class="secnum">6.2.3</span> DefaultLocale ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-currency-codes" title="Currency Codes"><span class="secnum">6.3</span> Currency Codes</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedcurrencycode" title="IsWellFormedCurrencyCode ( currency )"><span class="secnum">6.3.1</span> IsWellFormedCurrencyCode ( <var>currency</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcurrencies" title="AvailableCanonicalCurrencies ( )"><span class="secnum">6.4</span> AvailableCanonicalCurrencies ( )</a></li><li><span class="item-toggle">+</span><a href="#sec-use-of-iana-time-zone-database" title="Use of the IANA Time Zone Database"><span class="secnum">6.5</span> Use of the IANA Time Zone Database</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-availablenamedtimezoneidentifiers" title="AvailableNamedTimeZoneIdentifiers ( )"><span class="secnum">6.5.1</span> AvailableNamedTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getavailablenamedtimezoneidentifier" title="GetAvailableNamedTimeZoneIdentifier ( timeZoneIdentifier )"><span class="secnum">6.5.2</span> GetAvailableNamedTimeZoneIdentifier ( <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availableprimarytimezoneidentifiers" title="AvailablePrimaryTimeZoneIdentifiers ( )"><span class="secnum">6.5.3</span> AvailablePrimaryTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-string-split-to-list" title="StringSplitToList ( S, separator )"><span class="secnum">6.5.4</span> StringSplitToList ( <var>S</var>, <var>separator</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-measurement-unit-identifiers" title="Measurement Unit Identifiers"><span class="secnum">6.6</span> Measurement Unit Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedunitidentifier" title="IsWellFormedUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.1</span> IsWellFormedUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-issanctionedsingleunitidentifier" title="IsSanctionedSingleUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.2</span> IsSanctionedSingleUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalunits" title="AvailableCanonicalUnits ( )"><span class="secnum">6.6.3</span> AvailableCanonicalUnits ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numberingsystem-identifiers" title="Numbering System Identifiers"><span class="secnum">6.7</span> Numbering System Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalnumberingsystems" title="AvailableCanonicalNumberingSystems ( )"><span class="secnum">6.7.1</span> AvailableCanonicalNumberingSystems ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-collation-types" title="Collation Types"><span class="secnum">6.8</span> Collation Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcollations" title="AvailableCanonicalCollations ( )"><span class="secnum">6.8.1</span> AvailableCanonicalCollations ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-calendar-types" title="Calendar Types"><span class="secnum">6.9</span> Calendar Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecalendars" title="AvailableCalendars ( )"><span class="secnum">6.9.1</span> AvailableCalendars ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-pattern-string-types" title="Pattern String Types"><span class="secnum">6.10</span> Pattern String Types</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#requirements" title="Requirements for Standard Built-in ECMAScript Objects"><span class="secnum">7</span> Requirements for Standard Built-in ECMAScript Objects</a></li><li><span class="item-toggle">+</span><a href="#intl-object" title="The Intl Object"><span class="secnum">8</span> The Intl Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-value-properties-of-the-intl-object" title="Value Properties of the Intl Object"><span class="secnum">8.1</span> Value Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl-%symbol.tostringtag%" title="Intl [ %Symbol.toStringTag% ]"><span class="secnum">8.1.1</span> Intl [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-constructor-properties-of-the-intl-object" title="Constructor Properties of the Intl Object"><span class="secnum">8.2</span> Constructor Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator-intro" title="Intl.Collator ( . . . )"><span class="secnum">8.2.1</span> Intl.Collator ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat-intro" title="Intl.DateTimeFormat ( . . . )"><span class="secnum">8.2.2</span> Intl.DateTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames-intro" title="Intl.DisplayNames ( . . . )"><span class="secnum">8.2.3</span> Intl.DisplayNames ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.listformat-intro" title="Intl.ListFormat ( . . . )"><span class="secnum">8.2.4</span> Intl.ListFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-intro" title="Intl.Locale ( . . . )"><span class="secnum">8.2.5</span> Intl.Locale ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-intro" title="Intl.NumberFormat ( . . . )"><span class="secnum">8.2.6</span> Intl.NumberFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-intro" title="Intl.PluralRules ( . . . )"><span class="secnum">8.2.7</span> Intl.PluralRules ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat-intro" title="Intl.RelativeTimeFormat ( . . . )"><span class="secnum">8.2.8</span> Intl.RelativeTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-intro" title="Intl.Segmenter ( . . . )"><span class="secnum">8.2.9</span> Intl.Segmenter ( . . . )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-properties-of-the-intl-object" title="Function Properties of the Intl Object"><span class="secnum">8.3</span> Function Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.getcanonicallocales" title="Intl.getCanonicalLocales ( locales )"><span class="secnum">8.3.1</span> Intl.getCanonicalLocales ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.supportedvaluesof" title="Intl.supportedValuesOf ( key )"><span class="secnum">8.3.2</span> Intl.supportedValuesOf ( <var>key</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-and-parameter-negotiation" title="Locale and Parameter Negotiation"><span class="secnum">9</span> Locale and Parameter Negotiation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internal-slots" title="Internal slots of Service Constructors"><span class="secnum">9.1</span> Internal slots of Service Constructors</a></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">9.2</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalizelocalelist" title="CanonicalizeLocaleList ( locales )"><span class="secnum">9.2.1</span> CanonicalizeLocaleList ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeuvalue" title="CanonicalizeUValue ( ukey, uvalue )"><span class="secnum">9.2.2</span> CanonicalizeUValue ( <var>ukey</var>, <var>uvalue</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebyprefix" title="LookupMatchingLocaleByPrefix ( availableLocales, requestedLocales )"><span class="secnum">9.2.3</span> LookupMatchingLocaleByPrefix ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebybestfit" title="LookupMatchingLocaleByBestFit ( availableLocales, requestedLocales )"><span class="secnum">9.2.4</span> LookupMatchingLocaleByBestFit ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unicode-extension-components" title="UnicodeExtensionComponents ( extension )"><span class="secnum">9.2.5</span> UnicodeExtensionComponents ( <var>extension</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-insert-unicode-extension-and-canonicalize" title="InsertUnicodeExtensionAndCanonicalize ( locale, attributes, keywords )"><span class="secnum">9.2.6</span> InsertUnicodeExtensionAndCanonicalize ( <var>locale</var>, <var>attributes</var>, <var>keywords</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvelocale" title="ResolveLocale ( availableLocales, requestedLocales, options, relevantExtensionKeys, localeData )"><span class="secnum">9.2.7</span> ResolveLocale ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var>, <var>relevantExtensionKeys</var>, <var>localeData</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-filterlocales" title="FilterLocales ( availableLocales, requestedLocales, options )"><span class="secnum">9.2.8</span> FilterLocales ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoptionsobject" title="GetOptionsObject ( options )"><span class="secnum">9.2.9</span> GetOptionsObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-coerceoptionstoobject" title="CoerceOptionsToObject ( options )"><span class="secnum">9.2.10</span> CoerceOptionsToObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoption" title="GetOption ( options, property, type, values, default )"><span class="secnum">9.2.11</span> GetOption ( <var>options</var>, <var>property</var>, <var>type</var>, <var>values</var>, <var>default</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getbooleanorstringnumberformatoption" title="GetBooleanOrStringNumberFormatOption ( options, property, stringValues, fallback )"><span class="secnum">9.2.12</span> GetBooleanOrStringNumberFormatOption ( <var>options</var>, <var>property</var>, <var>stringValues</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultnumberoption" title="DefaultNumberOption ( value, minimum, maximum, fallback )"><span class="secnum">9.2.13</span> DefaultNumberOption ( <var>value</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberoption" title="GetNumberOption ( options, property, minimum, maximum, fallback )"><span class="secnum">9.2.14</span> GetNumberOption ( <var>options</var>, <var>property</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionpattern" title="PartitionPattern ( pattern )"><span class="secnum">9.2.15</span> PartitionPattern ( <var>pattern</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#collator-objects" title="Collator Objects"><span class="secnum">10</span> Collator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-the-intl-collator-constructor" title="The Intl.Collator Constructor"><span class="secnum">10.1</span> The Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator" title="Intl.Collator ( [ locales [ , options ] ] )"><span class="secnum">10.1.1</span> Intl.Collator ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-constructor" title="Properties of the Intl.Collator Constructor"><span class="secnum">10.2</span> Properties of the Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype" title="Intl.Collator.prototype"><span class="secnum">10.2.1</span> Intl.Collator.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.supportedlocalesof" title="Intl.Collator.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">10.2.2</span> Intl.Collator.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl-collator-internal-slots" title="Internal slots"><span class="secnum">10.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-prototype-object" title="Properties of the Intl.Collator Prototype Object"><span class="secnum">10.3</span> Properties of the Intl.Collator Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.constructor" title="Intl.Collator.prototype.constructor"><span class="secnum">10.3.1</span> Intl.Collator.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype-%symbol.tostringtag%" title="Intl.Collator.prototype [ %Symbol.toStringTag% ]"><span class="secnum">10.3.2</span> Intl.Collator.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.collator.prototype.compare" title="get Intl.Collator.prototype.compare"><span class="secnum">10.3.3</span> get Intl.Collator.prototype.compare</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-collator-compare-functions" title="Collator Compare Functions"><span class="secnum">10.3.3.1</span> Collator Compare Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-collator-comparestrings" title="CompareStrings ( collator, x, y )"><span class="secnum">10.3.3.2</span> CompareStrings ( <var>collator</var>, <var>x</var>, <var>y</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.resolvedoptions" title="Intl.Collator.prototype.resolvedOptions ( )"><span class="secnum">10.3.4</span> Intl.Collator.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-collator-instances" title="Properties of Intl.Collator Instances"><span class="secnum">10.4</span> Properties of Intl.Collator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#datetimeformat-objects" title="DateTimeFormat Objects"><span class="secnum">11</span> DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-datetimeformat-constructor" title="The Intl.DateTimeFormat Constructor"><span class="secnum">11.1</span> The Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat" title="Intl.DateTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">11.1.1</span> Intl.DateTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chaindatetimeformat" title="ChainDateTimeFormat ( dateTimeFormat, newTarget, this )"><span class="secnum">11.1.1.1</span> ChainDateTimeFormat ( <var>dateTimeFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-createdatetimeformat" title="CreateDateTimeFormat ( newTarget, locales, options, required, defaults )"><span class="secnum">11.1.2</span> CreateDateTimeFormat ( <var>newTarget</var>, <var>locales</var>, <var>options</var>, <var>required</var>, <var>defaults</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatoffsettimezoneidentifier" title="FormatOffsetTimeZoneIdentifier ( offsetMinutes )"><span class="secnum">11.1.3</span> FormatOffsetTimeZoneIdentifier ( <var>offsetMinutes</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-constructor" title="Properties of the Intl.DateTimeFormat Constructor"><span class="secnum">11.2</span> Properties of the Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype" title="Intl.DateTimeFormat.prototype"><span class="secnum">11.2.1</span> Intl.DateTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.supportedlocalesof" title="Intl.DateTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">11.2.2</span> Intl.DateTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat-internal-slots" title="Internal slots"><span class="secnum">11.2.3</span> Internal slots</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-format-record" title="DateTime Format Records"><span class="secnum">11.2.3.1</span> DateTime Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-record" title="DateTime Range Pattern Records"><span class="secnum">11.2.3.2</span> DateTime Range Pattern Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-format-record" title="DateTime Range Pattern Format Records"><span class="secnum">11.2.3.3</span> DateTime Range Pattern Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-part-record" title="DateTime Range Pattern Part Records"><span class="secnum">11.2.3.4</span> DateTime Range Pattern Part Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-styles-record" title="DateTime Styles Records"><span class="secnum">11.2.3.5</span> DateTime Styles Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-record" title="DateTime Style Records"><span class="secnum">11.2.3.6</span> DateTime Style Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-connector-record" title="DateTime Connector Records"><span class="secnum">11.2.3.7</span> DateTime Connector Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-date-range-record" title="DateTime Date Range Records"><span class="secnum">11.2.3.8</span> DateTime Date Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-time-range-record" title="DateTime Time Range Records"><span class="secnum">11.2.3.9</span> DateTime Time Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-range-record" title="DateTime Style Range Records"><span class="secnum">11.2.3.10</span> DateTime Style Range Records</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-prototype-object" title="Properties of the Intl.DateTimeFormat Prototype Object"><span class="secnum">11.3</span> Properties of the Intl.DateTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.constructor" title="Intl.DateTimeFormat.prototype.constructor"><span class="secnum">11.3.1</span> Intl.DateTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype-%symbol.tostringtag%" title="Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">11.3.2</span> Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.format" title="get Intl.DateTimeFormat.prototype.format"><span class="secnum">11.3.3</span> get Intl.DateTimeFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatToParts" title="Intl.DateTimeFormat.prototype.formatToParts ( date )"><span class="secnum">11.3.4</span> Intl.DateTimeFormat.prototype.formatToParts ( <var>date</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.formatRange" title="Intl.DateTimeFormat.prototype.formatRange ( startDate, endDate )"><span class="secnum">11.3.5</span> Intl.DateTimeFormat.prototype.formatRange ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatRangeToParts" title="Intl.DateTimeFormat.prototype.formatRangeToParts ( startDate, endDate )"><span class="secnum">11.3.6</span> Intl.DateTimeFormat.prototype.formatRangeToParts ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.resolvedoptions" title="Intl.DateTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">11.3.7</span> Intl.DateTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-datetimeformat-instances" title="Properties of Intl.DateTimeFormat Instances"><span class="secnum">11.4</span> Properties of Intl.DateTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-datetimeformat-abstracts" title="Abstract Operations for DateTimeFormat Objects"><span class="secnum">11.5</span> Abstract Operations for DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-time-style-format" title="DateTimeStyleFormat ( dateStyle, timeStyle, styles )"><span class="secnum">11.5.1</span> DateTimeStyleFormat ( <var>dateStyle</var>, <var>timeStyle</var>, <var>styles</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-basicformatmatcher" title="BasicFormatMatcher ( options, formats )"><span class="secnum">11.5.2</span> BasicFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-bestfitformatmatcher" title="BestFitFormatMatcher ( options, formats )"><span class="secnum">11.5.3</span> BestFitFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetime-format-functions" title="DateTime Format Functions"><span class="secnum">11.5.4</span> DateTime Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimepattern" title="FormatDateTimePattern ( dateTimeFormat, format, pattern, epochNanoseconds )"><span class="secnum">11.5.5</span> FormatDateTimePattern ( <var>dateTimeFormat</var>, <var>format</var>, <var>pattern</var>, <var>epochNanoseconds</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimepattern" title="PartitionDateTimePattern ( dateTimeFormat, x )"><span class="secnum">11.5.6</span> PartitionDateTimePattern ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetime" title="FormatDateTime ( dateTimeFormat, x )"><span class="secnum">11.5.7</span> FormatDateTime ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimetoparts" title="FormatDateTimeToParts ( dateTimeFormat, x )"><span class="secnum">11.5.8</span> FormatDateTimeToParts ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimerangepattern" title="PartitionDateTimeRangePattern ( dateTimeFormat, x, y )"><span class="secnum">11.5.9</span> PartitionDateTimeRangePattern ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerange" title="FormatDateTimeRange ( dateTimeFormat, x, y )"><span class="secnum">11.5.10</span> FormatDateTimeRange ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerangetoparts" title="FormatDateTimeRangeToParts ( dateTimeFormat, x, y )"><span class="secnum">11.5.11</span> FormatDateTimeRangeToParts ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-tolocaltime" title="ToLocalTime ( epochNs, calendar, timeZoneIdentifier )"><span class="secnum">11.5.12</span> ToLocalTime ( <var>epochNs</var>, <var>calendar</var>, <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-tolocaltime-records" title="ToLocalTime Records"><span class="secnum">11.5.13</span> ToLocalTime Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapdatetimeformat" title="UnwrapDateTimeFormat ( dtf )"><span class="secnum">11.5.14</span> UnwrapDateTimeFormat ( <var>dtf</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#intl-displaynames-objects" title="DisplayNames Objects"><span class="secnum">12</span> DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-constructor" title="The Intl.DisplayNames Constructor"><span class="secnum">12.1</span> The Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames" title="Intl.DisplayNames ( locales, options )"><span class="secnum">12.1.1</span> Intl.DisplayNames ( <var>locales</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-constructor" title="Properties of the Intl.DisplayNames Constructor"><span class="secnum">12.2</span> Properties of the Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype" title="Intl.DisplayNames.prototype"><span class="secnum">12.2.1</span> Intl.DisplayNames.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.supportedLocalesOf" title="Intl.DisplayNames.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">12.2.2</span> Intl.DisplayNames.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames-internal-slots" title="Internal slots"><span class="secnum">12.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-prototype-object" title="Properties of the Intl.DisplayNames Prototype Object"><span class="secnum">12.3</span> Properties of the Intl.DisplayNames Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.constructor" title="Intl.DisplayNames.prototype.constructor"><span class="secnum">12.3.1</span> Intl.DisplayNames.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames.prototype-%symbol.tostringtag%" title="Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]"><span class="secnum">12.3.2</span> Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.of" title="Intl.DisplayNames.prototype.of ( code )"><span class="secnum">12.3.3</span> Intl.DisplayNames.prototype.of ( <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.resolvedOptions" title="Intl.DisplayNames.prototype.resolvedOptions ( )"><span class="secnum">12.3.4</span> Intl.DisplayNames.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-displaynames-instances" title="Properties of Intl.DisplayNames Instances"><span class="secnum">12.4</span> Properties of Intl.DisplayNames Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-abstracts" title="Abstract Operations for DisplayNames Objects"><span class="secnum">12.5</span> Abstract Operations for DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalcodefordisplaynames" title="CanonicalCodeForDisplayNames ( type, code )"><span class="secnum">12.5.1</span> CanonicalCodeForDisplayNames ( <var>type</var>, <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvaliddatetimefieldcode" title="IsValidDateTimeFieldCode ( field )"><span class="secnum">12.5.2</span> IsValidDateTimeFieldCode ( <var>field</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#listformat-objects" title="ListFormat Objects"><span class="secnum">13</span> ListFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-constructor" title="The Intl.ListFormat Constructor"><span class="secnum">13.1</span> The Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat" title="Intl.ListFormat ( [ locales [ , options ] ] )"><span class="secnum">13.1.1</span> Intl.ListFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-constructor" title="Properties of the Intl.ListFormat Constructor"><span class="secnum">13.2</span> Properties of the Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype" title="Intl.ListFormat.prototype"><span class="secnum">13.2.1</span> Intl.ListFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.supportedLocalesOf" title="Intl.ListFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">13.2.2</span> Intl.ListFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat-internal-slots" title="Internal slots"><span class="secnum">13.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-prototype-object" title="Properties of the Intl.ListFormat Prototype Object"><span class="secnum">13.3</span> Properties of the Intl.ListFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.constructor" title="Intl.ListFormat.prototype.constructor"><span class="secnum">13.3.1</span> Intl.ListFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype-toStringTag" title="Intl.ListFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">13.3.2</span> Intl.ListFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.format" title="Intl.ListFormat.prototype.format ( list )"><span class="secnum">13.3.3</span> Intl.ListFormat.prototype.format ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.formatToParts" title="Intl.ListFormat.prototype.formatToParts ( list )"><span class="secnum">13.3.4</span> Intl.ListFormat.prototype.formatToParts ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.resolvedoptions" title="Intl.ListFormat.prototype.resolvedOptions ( )"><span class="secnum">13.3.5</span> Intl.ListFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-listformat-instances" title="Properties of Intl.ListFormat Instances"><span class="secnum">13.4</span> Properties of Intl.ListFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-abstracts" title="Abstract Operations for ListFormat Objects"><span class="secnum">13.5</span> Abstract Operations for ListFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-deconstructpattern" title="DeconstructPattern ( pattern, placeables )"><span class="secnum">13.5.1</span> DeconstructPattern ( <var>pattern</var>, <var>placeables</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createpartsfromlist" title="CreatePartsFromList ( listFormat, list )"><span class="secnum">13.5.2</span> CreatePartsFromList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlist" title="FormatList ( listFormat, list )"><span class="secnum">13.5.3</span> FormatList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlisttoparts" title="FormatListToParts ( listFormat, list )"><span class="secnum">13.5.4</span> FormatListToParts ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createstringlistfromiterable" title="StringListFromIterable ( iterable )"><span class="secnum">13.5.5</span> StringListFromIterable ( <var>iterable</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-objects" title="Locale Objects"><span class="secnum">14</span> Locale Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-locale-constructor" title="The Intl.Locale Constructor"><span class="secnum">14.1</span> The Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale" title="Intl.Locale ( tag [ , options ] )"><span class="secnum">14.1.1</span> Intl.Locale ( <var>tag</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-updatelanguageid" title="UpdateLanguageId ( tag, options )"><span class="secnum">14.1.2</span> UpdateLanguageId ( <var>tag</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makelocalerecord" title="MakeLocaleRecord ( tag, options, localeExtensionKeys )"><span class="secnum">14.1.3</span> MakeLocaleRecord ( <var>tag</var>, <var>options</var>, <var>localeExtensionKeys</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-constructor" title="Properties of the Intl.Locale Constructor"><span class="secnum">14.2</span> Properties of the Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype" title="Intl.Locale.prototype"><span class="secnum">14.2.1</span> Intl.Locale.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-internal-slots" title="Internal slots"><span class="secnum">14.2.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-prototype-object" title="Properties of the Intl.Locale Prototype Object"><span class="secnum">14.3</span> Properties of the Intl.Locale Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.constructor" title="Intl.Locale.prototype.constructor"><span class="secnum">14.3.1</span> Intl.Locale.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale.prototype-%symbol.tostringtag%" title="Intl.Locale.prototype [ %Symbol.toStringTag% ]"><span class="secnum">14.3.2</span> Intl.Locale.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.maximize" title="Intl.Locale.prototype.maximize ( )"><span class="secnum">14.3.3</span> Intl.Locale.prototype.maximize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.minimize" title="Intl.Locale.prototype.minimize ( )"><span class="secnum">14.3.4</span> Intl.Locale.prototype.minimize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.toString" title="Intl.Locale.prototype.toString ( )"><span class="secnum">14.3.5</span> Intl.Locale.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.baseName" title="get Intl.Locale.prototype.baseName"><span class="secnum">14.3.6</span> get Intl.Locale.prototype.baseName</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.calendar" title="get Intl.Locale.prototype.calendar"><span class="secnum">14.3.7</span> get Intl.Locale.prototype.calendar</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.caseFirst" title="get Intl.Locale.prototype.caseFirst"><span class="secnum">14.3.8</span> get Intl.Locale.prototype.caseFirst</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.collation" title="get Intl.Locale.prototype.collation"><span class="secnum">14.3.9</span> get Intl.Locale.prototype.collation</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.hourCycle" title="get Intl.Locale.prototype.hourCycle"><span class="secnum">14.3.10</span> get Intl.Locale.prototype.hourCycle</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numeric" title="get Intl.Locale.prototype.numeric"><span class="secnum">14.3.11</span> get Intl.Locale.prototype.numeric</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numberingSystem" title="get Intl.Locale.prototype.numberingSystem"><span class="secnum">14.3.12</span> get Intl.Locale.prototype.numberingSystem</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.language" title="get Intl.Locale.prototype.language"><span class="secnum">14.3.13</span> get Intl.Locale.prototype.language</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.script" title="get Intl.Locale.prototype.script"><span class="secnum">14.3.14</span> get Intl.Locale.prototype.script</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.region" title="get Intl.Locale.prototype.region"><span class="secnum">14.3.15</span> get Intl.Locale.prototype.region</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-locale-instances" title="Properties of Intl.Locale Instances"><span class="secnum">14.4</span> Properties of Intl.Locale Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-locale-abstracts" title="Abstract Operations for Locale Objects"><span class="secnum">14.5</span> Abstract Operations for Locale Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getlocalebasename" title="GetLocaleBaseName ( locale )"><span class="secnum">14.5.1</span> GetLocaleBaseName ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalelanguage" title="GetLocaleLanguage ( locale )"><span class="secnum">14.5.2</span> GetLocaleLanguage ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalescript" title="GetLocaleScript ( locale )"><span class="secnum">14.5.3</span> GetLocaleScript ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocaleregion" title="GetLocaleRegion ( locale )"><span class="secnum">14.5.4</span> GetLocaleRegion ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalevariants" title="GetLocaleVariants ( locale )"><span class="secnum">14.5.5</span> GetLocaleVariants ( <var>locale</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#numberformat-objects" title="NumberFormat Objects"><span class="secnum">15</span> NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-numberformat-constructor" title="The Intl.NumberFormat Constructor"><span class="secnum">15.1</span> The Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.numberformat" title="Intl.NumberFormat ( [ locales [ , options ] ] )"><span class="secnum">15.1.1</span> Intl.NumberFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chainnumberformat" title="ChainNumberFormat ( numberFormat, newTarget, this )"><span class="secnum">15.1.1.1</span> ChainNumberFormat ( <var>numberFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-setnfdigitoptions" title="SetNumberFormatDigitOptions ( intlObj, options, mnfdDefault, mxfdDefault, notation )"><span class="secnum">15.1.2</span> SetNumberFormatDigitOptions ( <var>intlObj</var>, <var>options</var>, <var>mnfdDefault</var>, <var>mxfdDefault</var>, <var>notation</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-setnumberformatunitoptions" title="SetNumberFormatUnitOptions ( intlObj, options )"><span class="secnum">15.1.3</span> SetNumberFormatUnitOptions ( <var>intlObj</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-constructor" title="Properties of the Intl.NumberFormat Constructor"><span class="secnum">15.2</span> Properties of the Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype" title="Intl.NumberFormat.prototype"><span class="secnum">15.2.1</span> Intl.NumberFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.supportedlocalesof" title="Intl.NumberFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">15.2.2</span> Intl.NumberFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-internal-slots" title="Internal slots"><span class="secnum">15.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-prototype-object" title="Properties of the Intl.NumberFormat Prototype Object"><span class="secnum">15.3</span> Properties of the Intl.NumberFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.constructor" title="Intl.NumberFormat.prototype.constructor"><span class="secnum">15.3.1</span> Intl.NumberFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype-%symbol.tostringtag%" title="Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">15.3.2</span> Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.format" title="get Intl.NumberFormat.prototype.format"><span class="secnum">15.3.3</span> get Intl.NumberFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formattoparts" title="Intl.NumberFormat.prototype.formatToParts ( value )"><span class="secnum">15.3.4</span> Intl.NumberFormat.prototype.formatToParts ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrange" title="Intl.NumberFormat.prototype.formatRange ( start, end )"><span class="secnum">15.3.5</span> Intl.NumberFormat.prototype.formatRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrangetoparts" title="Intl.NumberFormat.prototype.formatRangeToParts ( start, end )"><span class="secnum">15.3.6</span> Intl.NumberFormat.prototype.formatRangeToParts ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.resolvedoptions" title="Intl.NumberFormat.prototype.resolvedOptions ( )"><span class="secnum">15.3.7</span> Intl.NumberFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-numberformat-instances" title="Properties of Intl.NumberFormat Instances"><span class="secnum">15.4</span> Properties of Intl.NumberFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-numberformat-abstracts" title="Abstract Operations for NumberFormat Objects"><span class="secnum">15.5</span> Abstract Operations for NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-currencydigits" title="CurrencyDigits ( currency )"><span class="secnum">15.5.1</span> CurrencyDigits ( <var>currency</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-number-format-functions" title="Number Format Functions"><span class="secnum">15.5.2</span> Number Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumberstring" title="FormatNumericToString ( intlObject, x )"><span class="secnum">15.5.3</span> FormatNumericToString ( <var>intlObject</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberpattern" title="PartitionNumberPattern ( numberFormat, x )"><span class="secnum">15.5.4</span> PartitionNumberPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnotationsubpattern" title="PartitionNotationSubPattern ( numberFormat, x, n, exponent )"><span class="secnum">15.5.5</span> PartitionNotationSubPattern ( <var>numberFormat</var>, <var>x</var>, <var>n</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumber" title="FormatNumeric ( numberFormat, x )"><span class="secnum">15.5.6</span> FormatNumeric ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumbertoparts" title="FormatNumericToParts ( numberFormat, x )"><span class="secnum">15.5.7</span> FormatNumericToParts ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawprecision" title="ToRawPrecision ( x, minPrecision, maxPrecision, unsignedRoundingMode )"><span class="secnum">15.5.8</span> ToRawPrecision ( <var>x</var>, <var>minPrecision</var>, <var>maxPrecision</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawfixed" title="ToRawFixed ( x, minFraction, maxFraction, roundingIncrement, unsignedRoundingMode )"><span class="secnum">15.5.9</span> ToRawFixed ( <var>x</var>, <var>minFraction</var>, <var>maxFraction</var>, <var>roundingIncrement</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapnumberformat" title="UnwrapNumberFormat ( nf )"><span class="secnum">15.5.10</span> UnwrapNumberFormat ( <var>nf</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberformatpattern" title="GetNumberFormatPattern ( numberFormat, x )"><span class="secnum">15.5.11</span> GetNumberFormatPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnotationsubpattern" title="GetNotationSubPattern ( numberFormat, exponent )"><span class="secnum">15.5.12</span> GetNotationSubPattern ( <var>numberFormat</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponent" title="ComputeExponent ( numberFormat, x )"><span class="secnum">15.5.13</span> ComputeExponent ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponentformagnitude" title="ComputeExponentForMagnitude ( numberFormat, magnitude )"><span class="secnum">15.5.14</span> ComputeExponentForMagnitude ( <var>numberFormat</var>, <var>magnitude</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-stringintlmv" title="Runtime Semantics: StringIntlMV"><span class="secnum">15.5.15</span> RS: StringIntlMV</a></li><li><span class="item-toggle-none"></span><a href="#sec-tointlmathematicalvalue" title="ToIntlMathematicalValue ( value )"><span class="secnum">15.5.16</span> ToIntlMathematicalValue ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getunsignedroundingmode" title="GetUnsignedRoundingMode ( roundingMode, sign )"><span class="secnum">15.5.17</span> GetUnsignedRoundingMode ( <var>roundingMode</var>, <var>sign</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-applyunsignedroundingmode" title="ApplyUnsignedRoundingMode ( x, r1, r2, unsignedRoundingMode )"><span class="secnum">15.5.18</span> ApplyUnsignedRoundingMode ( <var>x</var>, <var>r1</var>, <var>r2</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberrangepattern" title="PartitionNumberRangePattern ( numberFormat, x, y )"><span class="secnum">15.5.19</span> PartitionNumberRangePattern ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatapproximately" title="FormatApproximately ( numberFormat, result )"><span class="secnum">15.5.20</span> FormatApproximately ( <var>numberFormat</var>, <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-collapsenumberrange" title="CollapseNumberRange ( numberFormat, result )"><span class="secnum">15.5.21</span> CollapseNumberRange ( <var>numberFormat</var>, <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrange" title="FormatNumericRange ( numberFormat, x, y )"><span class="secnum">15.5.22</span> FormatNumericRange ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrangetoparts" title="FormatNumericRangeToParts ( numberFormat, x, y )"><span class="secnum">15.5.23</span> FormatNumericRangeToParts ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#pluralrules-objects" title="PluralRules Objects"><span class="secnum">16</span> PluralRules Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-constructor" title="The Intl.PluralRules Constructor"><span class="secnum">16.1</span> The Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules" title="Intl.PluralRules ( [ locales [ , options ] ] )"><span class="secnum">16.1.1</span> Intl.PluralRules ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-constructor" title="Properties of the Intl.PluralRules Constructor"><span class="secnum">16.2</span> Properties of the Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype" title="Intl.PluralRules.prototype"><span class="secnum">16.2.1</span> Intl.PluralRules.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.supportedlocalesof" title="Intl.PluralRules.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">16.2.2</span> Intl.PluralRules.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-internal-slots" title="Internal slots"><span class="secnum">16.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-prototype-object" title="Properties of the Intl.PluralRules Prototype Object"><span class="secnum">16.3</span> Properties of the Intl.PluralRules Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.constructor" title="Intl.PluralRules.prototype.constructor"><span class="secnum">16.3.1</span> Intl.PluralRules.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype-%symbol.tostringtag%" title="Intl.PluralRules.prototype [ %Symbol.toStringTag% ]"><span class="secnum">16.3.2</span> Intl.PluralRules.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.select" title="Intl.PluralRules.prototype.select ( value )"><span class="secnum">16.3.3</span> Intl.PluralRules.prototype.select ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.selectrange" title="Intl.PluralRules.prototype.selectRange ( start, end )"><span class="secnum">16.3.4</span> Intl.PluralRules.prototype.selectRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.resolvedoptions" title="Intl.PluralRules.prototype.resolvedOptions ( )"><span class="secnum">16.3.5</span> Intl.PluralRules.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-pluralrules-instances" title="Properties of Intl.PluralRules Instances"><span class="secnum">16.4</span> Properties of Intl.PluralRules Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-abstracts" title="Abstract Operations for PluralRules Objects"><span class="secnum">16.5</span> Abstract Operations for PluralRules Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselect" title="PluralRuleSelect ( locale, type, s )"><span class="secnum">16.5.1</span> PluralRuleSelect ( <var>locale</var>, <var>type</var>, <var>s</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolveplural" title="ResolvePlural ( pluralRules, n )"><span class="secnum">16.5.2</span> ResolvePlural ( <var>pluralRules</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselectrange" title="PluralRuleSelectRange ( locale, type, xp, yp )"><span class="secnum">16.5.3</span> PluralRuleSelectRange ( <var>locale</var>, <var>type</var>, <var>xp</var>, <var>yp</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvepluralrange" title="ResolvePluralRange ( pluralRules, x, y )"><span class="secnum">16.5.4</span> ResolvePluralRange ( <var>pluralRules</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#relativetimeformat-objects" title="RelativeTimeFormat Objects"><span class="secnum">17</span> RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat-constructor" title="The Intl.RelativeTimeFormat Constructor"><span class="secnum">17.1</span> The Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat" title="Intl.RelativeTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">17.1.1</span> Intl.RelativeTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-constructor" title="Properties of the Intl.RelativeTimeFormat Constructor"><span class="secnum">17.2</span> Properties of the Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype" title="Intl.RelativeTimeFormat.prototype"><span class="secnum">17.2.1</span> Intl.RelativeTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.supportedLocalesOf" title="Intl.RelativeTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">17.2.2</span> Intl.RelativeTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat-internal-slots" title="Internal slots"><span class="secnum">17.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-prototype-object" title="Properties of the Intl.RelativeTimeFormat Prototype Object"><span class="secnum">17.3</span> Properties of the Intl.RelativeTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.constructor" title="Intl.RelativeTimeFormat.prototype.constructor"><span class="secnum">17.3.1</span> Intl.RelativeTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype-toStringTag" title="Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">17.3.2</span> Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.format" title="Intl.RelativeTimeFormat.prototype.format ( value, unit )"><span class="secnum">17.3.3</span> Intl.RelativeTimeFormat.prototype.format ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.formatToParts" title="Intl.RelativeTimeFormat.prototype.formatToParts ( value, unit )"><span class="secnum">17.3.4</span> Intl.RelativeTimeFormat.prototype.formatToParts ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat.prototype.resolvedoptions" title="Intl.RelativeTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">17.3.5</span> Intl.RelativeTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-relativetimeformat-instances" title="Properties of Intl.RelativeTimeFormat Instances"><span class="secnum">17.4</span> Properties of Intl.RelativeTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat--abstracts" title="Abstract Operations for RelativeTimeFormat Objects"><span class="secnum">17.5</span> Abstract Operations for RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-singularrelativetimeunit" title="SingularRelativeTimeUnit ( unit )"><span class="secnum">17.5.1</span> SingularRelativeTimeUnit ( <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-PartitionRelativeTimePattern" title="PartitionRelativeTimePattern ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.2</span> PartitionRelativeTimePattern ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makepartslist" title="MakePartsList ( pattern, unit, parts )"><span class="secnum">17.5.3</span> MakePartsList ( <var>pattern</var>, <var>unit</var>, <var>parts</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTime" title="FormatRelativeTime ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.4</span> FormatRelativeTime ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTimeToParts" title="FormatRelativeTimeToParts ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.5</span> FormatRelativeTimeToParts ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#segmenter-objects" title="Segmenter Objects"><span class="secnum">18</span> Segmenter Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-constructor" title="The Intl.Segmenter Constructor"><span class="secnum">18.1</span> The Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter" title="Intl.Segmenter ( [ locales [ , options ] ] )"><span class="secnum">18.1.1</span> Intl.Segmenter ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-constructor" title="Properties of the Intl.Segmenter Constructor"><span class="secnum">18.2</span> Properties of the Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype" title="Intl.Segmenter.prototype"><span class="secnum">18.2.1</span> Intl.Segmenter.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.supportedlocalesof" title="Intl.Segmenter.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">18.2.2</span> Intl.Segmenter.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-internal-slots" title="Internal slots"><span class="secnum">18.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-prototype-object" title="Properties of the Intl.Segmenter Prototype Object"><span class="secnum">18.3</span> Properties of the Intl.Segmenter Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.constructor" title="Intl.Segmenter.prototype.constructor"><span class="secnum">18.3.1</span> Intl.Segmenter.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype-%symbol.tostringtag%" title="Intl.Segmenter.prototype [ %Symbol.toStringTag% ]"><span class="secnum">18.3.2</span> Intl.Segmenter.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.segment" title="Intl.Segmenter.prototype.segment ( string )"><span class="secnum">18.3.3</span> Intl.Segmenter.prototype.segment ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.resolvedoptions" title="Intl.Segmenter.prototype.resolvedOptions ( )"><span class="secnum">18.3.4</span> Intl.Segmenter.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-segmenter-instances" title="Properties of Intl.Segmenter Instances"><span class="secnum">18.4</span> Properties of Intl.Segmenter Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-segments-objects" title="Segments Objects"><span class="secnum">18.5</span> Segments Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentsobject" title="CreateSegmentsObject ( segmenter, string )"><span class="secnum">18.5.1</span> CreateSegmentsObject ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentsprototype%-object" title="The %IntlSegmentsPrototype% Object"><span class="secnum">18.5.2</span> The %IntlSegmentsPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%.containing" title="%IntlSegmentsPrototype%.containing ( index )"><span class="secnum">18.5.2.1</span> %IntlSegmentsPrototype%.containing ( <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%-%symbol.iterator%" title="%IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )"><span class="secnum">18.5.2.2</span> %IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segments-instances" title="Properties of Segments Instances"><span class="secnum">18.5.3</span> Properties of Segments Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-iterator-objects" title="Segment Iterator Objects"><span class="secnum">18.6</span> Segment Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentiterator" title="CreateSegmentIterator ( segmenter, string )"><span class="secnum">18.6.1</span> CreateSegmentIterator ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentiteratorprototype%-object" title="The %IntlSegmentIteratorPrototype% Object"><span class="secnum">18.6.2</span> The %IntlSegmentIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.next" title="%IntlSegmentIteratorPrototype%.next ( )"><span class="secnum">18.6.2.1</span> %IntlSegmentIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.%symbol.tostringtag%" title="%IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">18.6.2.2</span> %IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segment-iterator-instances" title="Properties of Segment Iterator Instances"><span class="secnum">18.6.3</span> Properties of Segment Iterator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-data-objects" title="Segment Data Objects"><span class="secnum">18.7</span> Segment Data Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentdataobject" title="CreateSegmentDataObject ( segmenter, string, startIndex, endIndex )"><span class="secnum">18.7.1</span> CreateSegmentDataObject ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>endIndex</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-abstracts" title="Abstract Operations for Segmenter Objects"><span class="secnum">18.8</span> Abstract Operations for Segmenter Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-findboundary" title="FindBoundary ( segmenter, string, startIndex, direction )"><span class="secnum">18.8.1</span> FindBoundary ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>direction</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-sensitive-functions" title="Locale Sensitive Functions of the ECMAScript Language Specification"><span class="secnum">19</span> Locale Sensitive Functions of the ECMAScript Language Specification</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-string-prototype-object" title="Properties of the String Prototype Object"><span class="secnum">19.1</span> Properties of the String Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-String.prototype.localeCompare" title="String.prototype.localeCompare ( that [ , locales [ , options ] ] )"><span class="secnum">19.1.1</span> String.prototype.localeCompare ( <var>that</var> [ , <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle">+</span><a href="#sup-string.prototype.tolocalelowercase" title="String.prototype.toLocaleLowerCase ( [ locales ] )"><span class="secnum">19.1.2</span> String.prototype.toLocaleLowerCase ( [ <var>locales</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-transform-case" title="TransformCase ( S, locales, targetCase )"><span class="secnum">19.1.2.1</span> TransformCase ( <var>S</var>, <var>locales</var>, <var>targetCase</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sup-string.prototype.tolocaleuppercase" title="String.prototype.toLocaleUpperCase ( [ locales ] )"><span class="secnum">19.1.3</span> String.prototype.toLocaleUpperCase ( [ <var>locales</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-number-prototype-object" title="Properties of the Number Prototype Object"><span class="secnum">19.2</span> Properties of the Number Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-number.prototype.tolocalestring" title="Number.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.2.1</span> Number.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-bigint-prototype-object" title="Properties of the BigInt Prototype Object"><span class="secnum">19.3</span> Properties of the BigInt Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-bigint.prototype.tolocalestring" title="BigInt.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.3.1</span> BigInt.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-date-prototype-object" title="Properties of the Date Prototype Object"><span class="secnum">19.4</span> Properties of the Date Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocalestring" title="Date.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.4.1</span> Date.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaledatestring" title="Date.prototype.toLocaleDateString ( [ locales [ , options ] ] )"><span class="secnum">19.4.2</span> Date.prototype.toLocaleDateString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaletimestring" title="Date.prototype.toLocaleTimeString ( [ locales [ , options ] ] )"><span class="secnum">19.4.3</span> Date.prototype.toLocaleTimeString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-array-prototype-object" title="Properties of the Array Prototype Object"><span class="secnum">19.5</span> Properties of the Array Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-array.prototype.tolocalestring" title="Array.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.5.1</span> Array.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#annex-implementation-dependent-behaviour" title="Implementation Dependent Behaviour"><span class="secnum">A</span> Implementation Dependent Behaviour</a></li><li><span class="item-toggle-none"></span><a href="#annex-incompatibilities" title="Additions and Changes That Introduce Incompatibilities with Prior Editions"><span class="secnum">B</span> Additions and Changes That Introduce Incompatibilities with Prior Editions</a></li><li><span class="item-toggle-none"></span><a href="#sec-colophon" title="Colophon"><span class="secnum">C</span> Colophon</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">D</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Draft ECMA-402 / November 25, 2024</h1><h1 class="title">ECMAScript® 2025 Internationalization API Specification</h1>
+    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#introduction" title="Introduction">Introduction</a></li><li><span class="item-toggle-none"></span><a href="#scope" title="Scope"><span class="secnum">1</span> Scope</a></li><li><span class="item-toggle-none"></span><a href="#conformance" title="Conformance"><span class="secnum">2</span> Conformance</a></li><li><span class="item-toggle-none"></span><a href="#normative-references" title="Normative References"><span class="secnum">3</span> Normative References</a></li><li><span class="item-toggle">+</span><a href="#overview" title="Overview"><span class="secnum">4</span> Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internationalization-localization-globalization" title="Internationalization, Localization, and Globalization"><span class="secnum">4.1</span> Internationalization, Localization, and Globalization</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-overview" title="API Overview"><span class="secnum">4.2</span> API Overview</a></li><li><span class="item-toggle-none"></span><a href="#sec-api-conventions" title="API Conventions"><span class="secnum">4.3</span> API Conventions</a></li><li><span class="item-toggle">+</span><a href="#sec-implementation-dependencies" title="Implementation Dependencies"><span class="secnum">4.4</span> Implementation Dependencies</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-compatibility" title="Compatibility across implementations"><span class="secnum">4.4.1</span> Compatibility across implementations</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#conventions" title="Notational Conventions"><span class="secnum">5</span> Notational Conventions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-402-well-known-intrinsic-objects" title="Well-Known Intrinsic Objects"><span class="secnum">5.1</span> Well-Known Intrinsic Objects</a></li></ol></li><li><span class="item-toggle">+</span><a href="#locales-currencies-tz" title="Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars"><span class="secnum">6</span> Identification of Locales, Currencies, Time Zones, Measurement Units, Numbering Systems, Collations, and Calendars</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-case-sensitivity-and-case-mapping" title="Case Sensitivity and Case Mapping"><span class="secnum">6.1</span> Case Sensitivity and Case Mapping</a></li><li><span class="item-toggle">+</span><a href="#sec-language-tags" title="Language Tags"><span class="secnum">6.2</span> Language Tags</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-isstructurallyvalidlanguagetag" title="IsStructurallyValidLanguageTag ( locale )"><span class="secnum">6.2.1</span> IsStructurallyValidLanguageTag ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeunicodelocaleid" title="CanonicalizeUnicodeLocaleId ( locale )"><span class="secnum">6.2.2</span> CanonicalizeUnicodeLocaleId ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultlocale" title="DefaultLocale ( )"><span class="secnum">6.2.3</span> DefaultLocale ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-currency-codes" title="Currency Codes"><span class="secnum">6.3</span> Currency Codes</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedcurrencycode" title="IsWellFormedCurrencyCode ( currency )"><span class="secnum">6.3.1</span> IsWellFormedCurrencyCode ( <var>currency</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcurrencies" title="AvailableCanonicalCurrencies ( )"><span class="secnum">6.4</span> AvailableCanonicalCurrencies ( )</a></li><li><span class="item-toggle">+</span><a href="#sec-use-of-iana-time-zone-database" title="Use of the IANA Time Zone Database"><span class="secnum">6.5</span> Use of the IANA Time Zone Database</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-availablenamedtimezoneidentifiers" title="AvailableNamedTimeZoneIdentifiers ( )"><span class="secnum">6.5.1</span> AvailableNamedTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getavailablenamedtimezoneidentifier" title="GetAvailableNamedTimeZoneIdentifier ( timeZoneIdentifier )"><span class="secnum">6.5.2</span> GetAvailableNamedTimeZoneIdentifier ( <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availableprimarytimezoneidentifiers" title="AvailablePrimaryTimeZoneIdentifiers ( )"><span class="secnum">6.5.3</span> AvailablePrimaryTimeZoneIdentifiers ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-string-split-to-list" title="StringSplitToList ( S, separator )"><span class="secnum">6.5.4</span> StringSplitToList ( <var>S</var>, <var>separator</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-measurement-unit-identifiers" title="Measurement Unit Identifiers"><span class="secnum">6.6</span> Measurement Unit Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-iswellformedunitidentifier" title="IsWellFormedUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.1</span> IsWellFormedUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-issanctionedsingleunitidentifier" title="IsSanctionedSingleUnitIdentifier ( unitIdentifier )"><span class="secnum">6.6.2</span> IsSanctionedSingleUnitIdentifier ( <var>unitIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalunits" title="AvailableCanonicalUnits ( )"><span class="secnum">6.6.3</span> AvailableCanonicalUnits ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numberingsystem-identifiers" title="Numbering System Identifiers"><span class="secnum">6.7</span> Numbering System Identifiers</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalnumberingsystems" title="AvailableCanonicalNumberingSystems ( )"><span class="secnum">6.7.1</span> AvailableCanonicalNumberingSystems ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-collation-types" title="Collation Types"><span class="secnum">6.8</span> Collation Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecanonicalcollations" title="AvailableCanonicalCollations ( )"><span class="secnum">6.8.1</span> AvailableCanonicalCollations ( )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-calendar-types" title="Calendar Types"><span class="secnum">6.9</span> Calendar Types</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-availablecalendars" title="AvailableCalendars ( )"><span class="secnum">6.9.1</span> AvailableCalendars ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-pattern-string-types" title="Pattern String Types"><span class="secnum">6.10</span> Pattern String Types</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#requirements" title="Requirements for Standard Built-in ECMAScript Objects"><span class="secnum">7</span> Requirements for Standard Built-in ECMAScript Objects</a></li><li><span class="item-toggle">+</span><a href="#intl-object" title="The Intl Object"><span class="secnum">8</span> The Intl Object</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-value-properties-of-the-intl-object" title="Value Properties of the Intl Object"><span class="secnum">8.1</span> Value Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl-%symbol.tostringtag%" title="Intl [ %Symbol.toStringTag% ]"><span class="secnum">8.1.1</span> Intl [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-constructor-properties-of-the-intl-object" title="Constructor Properties of the Intl Object"><span class="secnum">8.2</span> Constructor Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator-intro" title="Intl.Collator ( . . . )"><span class="secnum">8.2.1</span> Intl.Collator ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat-intro" title="Intl.DateTimeFormat ( . . . )"><span class="secnum">8.2.2</span> Intl.DateTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames-intro" title="Intl.DisplayNames ( . . . )"><span class="secnum">8.2.3</span> Intl.DisplayNames ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.listformat-intro" title="Intl.ListFormat ( . . . )"><span class="secnum">8.2.4</span> Intl.ListFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-intro" title="Intl.Locale ( . . . )"><span class="secnum">8.2.5</span> Intl.Locale ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-intro" title="Intl.NumberFormat ( . . . )"><span class="secnum">8.2.6</span> Intl.NumberFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-intro" title="Intl.PluralRules ( . . . )"><span class="secnum">8.2.7</span> Intl.PluralRules ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat-intro" title="Intl.RelativeTimeFormat ( . . . )"><span class="secnum">8.2.8</span> Intl.RelativeTimeFormat ( . . . )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-intro" title="Intl.Segmenter ( . . . )"><span class="secnum">8.2.9</span> Intl.Segmenter ( . . . )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-properties-of-the-intl-object" title="Function Properties of the Intl Object"><span class="secnum">8.3</span> Function Properties of the Intl Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.getcanonicallocales" title="Intl.getCanonicalLocales ( locales )"><span class="secnum">8.3.1</span> Intl.getCanonicalLocales ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.supportedvaluesof" title="Intl.supportedValuesOf ( key )"><span class="secnum">8.3.2</span> Intl.supportedValuesOf ( <var>key</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-and-parameter-negotiation" title="Locale and Parameter Negotiation"><span class="secnum">9</span> Locale and Parameter Negotiation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-internal-slots" title="Internal slots of Service Constructors"><span class="secnum">9.1</span> Internal slots of Service Constructors</a></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">9.2</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalizelocalelist" title="CanonicalizeLocaleList ( locales )"><span class="secnum">9.2.1</span> CanonicalizeLocaleList ( <var>locales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-canonicalizeuvalue" title="CanonicalizeUValue ( ukey, uvalue )"><span class="secnum">9.2.2</span> CanonicalizeUValue ( <var>ukey</var>, <var>uvalue</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebyprefix" title="LookupMatchingLocaleByPrefix ( availableLocales, requestedLocales )"><span class="secnum">9.2.3</span> LookupMatchingLocaleByPrefix ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-lookupmatchinglocalebybestfit" title="LookupMatchingLocaleByBestFit ( availableLocales, requestedLocales )"><span class="secnum">9.2.4</span> LookupMatchingLocaleByBestFit ( <var>availableLocales</var>, <var>requestedLocales</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unicode-extension-components" title="UnicodeExtensionComponents ( extension )"><span class="secnum">9.2.5</span> UnicodeExtensionComponents ( <var>extension</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-insert-unicode-extension-and-canonicalize" title="InsertUnicodeExtensionAndCanonicalize ( locale, attributes, keywords )"><span class="secnum">9.2.6</span> InsertUnicodeExtensionAndCanonicalize ( <var>locale</var>, <var>attributes</var>, <var>keywords</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvelocale" title="ResolveLocale ( availableLocales, requestedLocales, options, relevantExtensionKeys, localeData )"><span class="secnum">9.2.7</span> ResolveLocale ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var>, <var>relevantExtensionKeys</var>, <var>localeData</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-filterlocales" title="FilterLocales ( availableLocales, requestedLocales, options )"><span class="secnum">9.2.8</span> FilterLocales ( <var>availableLocales</var>, <var>requestedLocales</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoptionsobject" title="GetOptionsObject ( options )"><span class="secnum">9.2.9</span> GetOptionsObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-coerceoptionstoobject" title="CoerceOptionsToObject ( options )"><span class="secnum">9.2.10</span> CoerceOptionsToObject ( <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getoption" title="GetOption ( options, property, type, values, default )"><span class="secnum">9.2.11</span> GetOption ( <var>options</var>, <var>property</var>, <var>type</var>, <var>values</var>, <var>default</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getbooleanorstringnumberformatoption" title="GetBooleanOrStringNumberFormatOption ( options, property, stringValues, fallback )"><span class="secnum">9.2.12</span> GetBooleanOrStringNumberFormatOption ( <var>options</var>, <var>property</var>, <var>stringValues</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-defaultnumberoption" title="DefaultNumberOption ( value, minimum, maximum, fallback )"><span class="secnum">9.2.13</span> DefaultNumberOption ( <var>value</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberoption" title="GetNumberOption ( options, property, minimum, maximum, fallback )"><span class="secnum">9.2.14</span> GetNumberOption ( <var>options</var>, <var>property</var>, <var>minimum</var>, <var>maximum</var>, <var>fallback</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionpattern" title="PartitionPattern ( pattern )"><span class="secnum">9.2.15</span> PartitionPattern ( <var>pattern</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#collator-objects" title="Collator Objects"><span class="secnum">10</span> Collator Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-the-intl-collator-constructor" title="The Intl.Collator Constructor"><span class="secnum">10.1</span> The Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator" title="Intl.Collator ( [ locales [ , options ] ] )"><span class="secnum">10.1.1</span> Intl.Collator ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-constructor" title="Properties of the Intl.Collator Constructor"><span class="secnum">10.2</span> Properties of the Intl.Collator Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype" title="Intl.Collator.prototype"><span class="secnum">10.2.1</span> Intl.Collator.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.supportedlocalesof" title="Intl.Collator.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">10.2.2</span> Intl.Collator.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl-collator-internal-slots" title="Internal slots"><span class="secnum">10.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-intl-collator-prototype-object" title="Properties of the Intl.Collator Prototype Object"><span class="secnum">10.3</span> Properties of the Intl.Collator Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.constructor" title="Intl.Collator.prototype.constructor"><span class="secnum">10.3.1</span> Intl.Collator.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype-%symbol.tostringtag%" title="Intl.Collator.prototype [ %Symbol.toStringTag% ]"><span class="secnum">10.3.2</span> Intl.Collator.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.collator.prototype.compare" title="get Intl.Collator.prototype.compare"><span class="secnum">10.3.3</span> get Intl.Collator.prototype.compare</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-collator-compare-functions" title="Collator Compare Functions"><span class="secnum">10.3.3.1</span> Collator Compare Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-collator-comparestrings" title="CompareStrings ( collator, x, y )"><span class="secnum">10.3.3.2</span> CompareStrings ( <var>collator</var>, <var>x</var>, <var>y</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-intl.collator.prototype.resolvedoptions" title="Intl.Collator.prototype.resolvedOptions ( )"><span class="secnum">10.3.4</span> Intl.Collator.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-collator-instances" title="Properties of Intl.Collator Instances"><span class="secnum">10.4</span> Properties of Intl.Collator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#datetimeformat-objects" title="DateTimeFormat Objects"><span class="secnum">11</span> DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-datetimeformat-constructor" title="The Intl.DateTimeFormat Constructor"><span class="secnum">11.1</span> The Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat" title="Intl.DateTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">11.1.1</span> Intl.DateTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chaindatetimeformat" title="ChainDateTimeFormat ( dateTimeFormat, newTarget, this )"><span class="secnum">11.1.1.1</span> ChainDateTimeFormat ( <var>dateTimeFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-createdatetimeformat" title="CreateDateTimeFormat ( newTarget, locales, options, required, defaults )"><span class="secnum">11.1.2</span> CreateDateTimeFormat ( <var>newTarget</var>, <var>locales</var>, <var>options</var>, <var>required</var>, <var>defaults</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatoffsettimezoneidentifier" title="FormatOffsetTimeZoneIdentifier ( offsetMinutes )"><span class="secnum">11.1.3</span> FormatOffsetTimeZoneIdentifier ( <var>offsetMinutes</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-constructor" title="Properties of the Intl.DateTimeFormat Constructor"><span class="secnum">11.2</span> Properties of the Intl.DateTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype" title="Intl.DateTimeFormat.prototype"><span class="secnum">11.2.1</span> Intl.DateTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.supportedlocalesof" title="Intl.DateTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">11.2.2</span> Intl.DateTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle">+</span><a href="#sec-intl.datetimeformat-internal-slots" title="Internal slots"><span class="secnum">11.2.3</span> Internal slots</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-format-record" title="DateTime Format Records"><span class="secnum">11.2.3.1</span> DateTime Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-record" title="DateTime Range Pattern Records"><span class="secnum">11.2.3.2</span> DateTime Range Pattern Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-format-record" title="DateTime Range Pattern Format Records"><span class="secnum">11.2.3.3</span> DateTime Range Pattern Format Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-range-pattern-part-record" title="DateTime Range Pattern Part Records"><span class="secnum">11.2.3.4</span> DateTime Range Pattern Part Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-styles-record" title="DateTime Styles Records"><span class="secnum">11.2.3.5</span> DateTime Styles Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-record" title="DateTime Style Records"><span class="secnum">11.2.3.6</span> DateTime Style Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-connector-record" title="DateTime Connector Records"><span class="secnum">11.2.3.7</span> DateTime Connector Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-date-range-record" title="DateTime Date Range Records"><span class="secnum">11.2.3.8</span> DateTime Date Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-time-range-record" title="DateTime Time Range Records"><span class="secnum">11.2.3.9</span> DateTime Time Range Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-style-range-record" title="DateTime Style Range Records"><span class="secnum">11.2.3.10</span> DateTime Style Range Records</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-datetimeformat-prototype-object" title="Properties of the Intl.DateTimeFormat Prototype Object"><span class="secnum">11.3</span> Properties of the Intl.DateTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.constructor" title="Intl.DateTimeFormat.prototype.constructor"><span class="secnum">11.3.1</span> Intl.DateTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype-%symbol.tostringtag%" title="Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">11.3.2</span> Intl.DateTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.format" title="get Intl.DateTimeFormat.prototype.format"><span class="secnum">11.3.3</span> get Intl.DateTimeFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatToParts" title="Intl.DateTimeFormat.prototype.formatToParts ( date )"><span class="secnum">11.3.4</span> Intl.DateTimeFormat.prototype.formatToParts ( <var>date</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.formatRange" title="Intl.DateTimeFormat.prototype.formatRange ( startDate, endDate )"><span class="secnum">11.3.5</span> Intl.DateTimeFormat.prototype.formatRange ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DateTimeFormat.prototype.formatRangeToParts" title="Intl.DateTimeFormat.prototype.formatRangeToParts ( startDate, endDate )"><span class="secnum">11.3.6</span> Intl.DateTimeFormat.prototype.formatRangeToParts ( <var>startDate</var>, <var>endDate</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.datetimeformat.prototype.resolvedoptions" title="Intl.DateTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">11.3.7</span> Intl.DateTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-datetimeformat-instances" title="Properties of Intl.DateTimeFormat Instances"><span class="secnum">11.4</span> Properties of Intl.DateTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-datetimeformat-abstracts" title="Abstract Operations for DateTimeFormat Objects"><span class="secnum">11.5</span> Abstract Operations for DateTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-time-style-format" title="DateTimeStyleFormat ( dateStyle, timeStyle, styles )"><span class="secnum">11.5.1</span> DateTimeStyleFormat ( <var>dateStyle</var>, <var>timeStyle</var>, <var>styles</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-basicformatmatcher" title="BasicFormatMatcher ( options, formats )"><span class="secnum">11.5.2</span> BasicFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-bestfitformatmatcher" title="BestFitFormatMatcher ( options, formats )"><span class="secnum">11.5.3</span> BestFitFormatMatcher ( <var>options</var>, <var>formats</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetime-format-functions" title="DateTime Format Functions"><span class="secnum">11.5.4</span> DateTime Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimepattern" title="FormatDateTimePattern ( dateTimeFormat, format, pattern, epochNanoseconds )"><span class="secnum">11.5.5</span> FormatDateTimePattern ( <var>dateTimeFormat</var>, <var>format</var>, <var>pattern</var>, <var>epochNanoseconds</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimepattern" title="PartitionDateTimePattern ( dateTimeFormat, x )"><span class="secnum">11.5.6</span> PartitionDateTimePattern ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetime" title="FormatDateTime ( dateTimeFormat, x )"><span class="secnum">11.5.7</span> FormatDateTime ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimetoparts" title="FormatDateTimeToParts ( dateTimeFormat, x )"><span class="secnum">11.5.8</span> FormatDateTimeToParts ( <var>dateTimeFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitiondatetimerangepattern" title="PartitionDateTimeRangePattern ( dateTimeFormat, x, y )"><span class="secnum">11.5.9</span> PartitionDateTimeRangePattern ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerange" title="FormatDateTimeRange ( dateTimeFormat, x, y )"><span class="secnum">11.5.10</span> FormatDateTimeRange ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatdatetimerangetoparts" title="FormatDateTimeRangeToParts ( dateTimeFormat, x, y )"><span class="secnum">11.5.11</span> FormatDateTimeRangeToParts ( <var>dateTimeFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-tolocaltime" title="ToLocalTime ( epochNs, calendar, timeZoneIdentifier )"><span class="secnum">11.5.12</span> ToLocalTime ( <var>epochNs</var>, <var>calendar</var>, <var>timeZoneIdentifier</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-datetimeformat-tolocaltime-records" title="ToLocalTime Records"><span class="secnum">11.5.13</span> ToLocalTime Records</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapdatetimeformat" title="UnwrapDateTimeFormat ( dtf )"><span class="secnum">11.5.14</span> UnwrapDateTimeFormat ( <var>dtf</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#intl-displaynames-objects" title="DisplayNames Objects"><span class="secnum">12</span> DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-constructor" title="The Intl.DisplayNames Constructor"><span class="secnum">12.1</span> The Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames" title="Intl.DisplayNames ( locales, options )"><span class="secnum">12.1.1</span> Intl.DisplayNames ( <var>locales</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-constructor" title="Properties of the Intl.DisplayNames Constructor"><span class="secnum">12.2</span> Properties of the Intl.DisplayNames Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype" title="Intl.DisplayNames.prototype"><span class="secnum">12.2.1</span> Intl.DisplayNames.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.supportedLocalesOf" title="Intl.DisplayNames.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">12.2.2</span> Intl.DisplayNames.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames-internal-slots" title="Internal slots"><span class="secnum">12.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-displaynames-prototype-object" title="Properties of the Intl.DisplayNames Prototype Object"><span class="secnum">12.3</span> Properties of the Intl.DisplayNames Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.constructor" title="Intl.DisplayNames.prototype.constructor"><span class="secnum">12.3.1</span> Intl.DisplayNames.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.displaynames.prototype-%symbol.tostringtag%" title="Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]"><span class="secnum">12.3.2</span> Intl.DisplayNames.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.of" title="Intl.DisplayNames.prototype.of ( code )"><span class="secnum">12.3.3</span> Intl.DisplayNames.prototype.of ( <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.DisplayNames.prototype.resolvedOptions" title="Intl.DisplayNames.prototype.resolvedOptions ( )"><span class="secnum">12.3.4</span> Intl.DisplayNames.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-displaynames-instances" title="Properties of Intl.DisplayNames Instances"><span class="secnum">12.4</span> Properties of Intl.DisplayNames Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-displaynames-abstracts" title="Abstract Operations for DisplayNames Objects"><span class="secnum">12.5</span> Abstract Operations for DisplayNames Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-canonicalcodefordisplaynames" title="CanonicalCodeForDisplayNames ( type, code )"><span class="secnum">12.5.1</span> CanonicalCodeForDisplayNames ( <var>type</var>, <var>code</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvaliddatetimefieldcode" title="IsValidDateTimeFieldCode ( field )"><span class="secnum">12.5.2</span> IsValidDateTimeFieldCode ( <var>field</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#listformat-objects" title="ListFormat Objects"><span class="secnum">13</span> ListFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-constructor" title="The Intl.ListFormat Constructor"><span class="secnum">13.1</span> The Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat" title="Intl.ListFormat ( [ locales [ , options ] ] )"><span class="secnum">13.1.1</span> Intl.ListFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-constructor" title="Properties of the Intl.ListFormat Constructor"><span class="secnum">13.2</span> Properties of the Intl.ListFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype" title="Intl.ListFormat.prototype"><span class="secnum">13.2.1</span> Intl.ListFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.supportedLocalesOf" title="Intl.ListFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">13.2.2</span> Intl.ListFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat-internal-slots" title="Internal slots"><span class="secnum">13.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-listformat-prototype-object" title="Properties of the Intl.ListFormat Prototype Object"><span class="secnum">13.3</span> Properties of the Intl.ListFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.constructor" title="Intl.ListFormat.prototype.constructor"><span class="secnum">13.3.1</span> Intl.ListFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype-toStringTag" title="Intl.ListFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">13.3.2</span> Intl.ListFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.format" title="Intl.ListFormat.prototype.format ( list )"><span class="secnum">13.3.3</span> Intl.ListFormat.prototype.format ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.formatToParts" title="Intl.ListFormat.prototype.formatToParts ( list )"><span class="secnum">13.3.4</span> Intl.ListFormat.prototype.formatToParts ( <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.ListFormat.prototype.resolvedoptions" title="Intl.ListFormat.prototype.resolvedOptions ( )"><span class="secnum">13.3.5</span> Intl.ListFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-listformat-instances" title="Properties of Intl.ListFormat Instances"><span class="secnum">13.4</span> Properties of Intl.ListFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-listformat-abstracts" title="Abstract Operations for ListFormat Objects"><span class="secnum">13.5</span> Abstract Operations for ListFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-deconstructpattern" title="DeconstructPattern ( pattern, placeables )"><span class="secnum">13.5.1</span> DeconstructPattern ( <var>pattern</var>, <var>placeables</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createpartsfromlist" title="CreatePartsFromList ( listFormat, list )"><span class="secnum">13.5.2</span> CreatePartsFromList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlist" title="FormatList ( listFormat, list )"><span class="secnum">13.5.3</span> FormatList ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatlisttoparts" title="FormatListToParts ( listFormat, list )"><span class="secnum">13.5.4</span> FormatListToParts ( <var>listFormat</var>, <var>list</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-createstringlistfromiterable" title="StringListFromIterable ( iterable )"><span class="secnum">13.5.5</span> StringListFromIterable ( <var>iterable</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-objects" title="Locale Objects"><span class="secnum">14</span> Locale Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-locale-constructor" title="The Intl.Locale Constructor"><span class="secnum">14.1</span> The Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale" title="Intl.Locale ( tag [ , options ] )"><span class="secnum">14.1.1</span> Intl.Locale ( <var>tag</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-updatelanguageid" title="UpdateLanguageId ( tag, options )"><span class="secnum">14.1.2</span> UpdateLanguageId ( <var>tag</var>, <var>options</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makelocalerecord" title="MakeLocaleRecord ( tag, options, localeExtensionKeys )"><span class="secnum">14.1.3</span> MakeLocaleRecord ( <var>tag</var>, <var>options</var>, <var>localeExtensionKeys</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-constructor" title="Properties of the Intl.Locale Constructor"><span class="secnum">14.2</span> Properties of the Intl.Locale Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype" title="Intl.Locale.prototype"><span class="secnum">14.2.1</span> Intl.Locale.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale-internal-slots" title="Internal slots"><span class="secnum">14.2.2</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-locale-prototype-object" title="Properties of the Intl.Locale Prototype Object"><span class="secnum">14.3</span> Properties of the Intl.Locale Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.constructor" title="Intl.Locale.prototype.constructor"><span class="secnum">14.3.1</span> Intl.Locale.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.locale.prototype-%symbol.tostringtag%" title="Intl.Locale.prototype [ %Symbol.toStringTag% ]"><span class="secnum">14.3.2</span> Intl.Locale.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.maximize" title="Intl.Locale.prototype.maximize ( )"><span class="secnum">14.3.3</span> Intl.Locale.prototype.maximize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.minimize" title="Intl.Locale.prototype.minimize ( )"><span class="secnum">14.3.4</span> Intl.Locale.prototype.minimize ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.toString" title="Intl.Locale.prototype.toString ( )"><span class="secnum">14.3.5</span> Intl.Locale.prototype.toString ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.baseName" title="get Intl.Locale.prototype.baseName"><span class="secnum">14.3.6</span> get Intl.Locale.prototype.baseName</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.calendar" title="get Intl.Locale.prototype.calendar"><span class="secnum">14.3.7</span> get Intl.Locale.prototype.calendar</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.caseFirst" title="get Intl.Locale.prototype.caseFirst"><span class="secnum">14.3.8</span> get Intl.Locale.prototype.caseFirst</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.collation" title="get Intl.Locale.prototype.collation"><span class="secnum">14.3.9</span> get Intl.Locale.prototype.collation</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.hourCycle" title="get Intl.Locale.prototype.hourCycle"><span class="secnum">14.3.10</span> get Intl.Locale.prototype.hourCycle</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numeric" title="get Intl.Locale.prototype.numeric"><span class="secnum">14.3.11</span> get Intl.Locale.prototype.numeric</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.numberingSystem" title="get Intl.Locale.prototype.numberingSystem"><span class="secnum">14.3.12</span> get Intl.Locale.prototype.numberingSystem</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.language" title="get Intl.Locale.prototype.language"><span class="secnum">14.3.13</span> get Intl.Locale.prototype.language</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.script" title="get Intl.Locale.prototype.script"><span class="secnum">14.3.14</span> get Intl.Locale.prototype.script</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.Locale.prototype.region" title="get Intl.Locale.prototype.region"><span class="secnum">14.3.15</span> get Intl.Locale.prototype.region</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-locale-instances" title="Properties of Intl.Locale Instances"><span class="secnum">14.4</span> Properties of Intl.Locale Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-locale-abstracts" title="Abstract Operations for Locale Objects"><span class="secnum">14.5</span> Abstract Operations for Locale Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-getlocalebasename" title="GetLocaleBaseName ( locale )"><span class="secnum">14.5.1</span> GetLocaleBaseName ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalelanguage" title="GetLocaleLanguage ( locale )"><span class="secnum">14.5.2</span> GetLocaleLanguage ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalescript" title="GetLocaleScript ( locale )"><span class="secnum">14.5.3</span> GetLocaleScript ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocaleregion" title="GetLocaleRegion ( locale )"><span class="secnum">14.5.4</span> GetLocaleRegion ( <var>locale</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getlocalevariants" title="GetLocaleVariants ( locale )"><span class="secnum">14.5.5</span> GetLocaleVariants ( <var>locale</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#numberformat-objects" title="NumberFormat Objects"><span class="secnum">15</span> NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-numberformat-constructor" title="The Intl.NumberFormat Constructor"><span class="secnum">15.1</span> The Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl.numberformat" title="Intl.NumberFormat ( [ locales [ , options ] ] )"><span class="secnum">15.1.1</span> Intl.NumberFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-chainnumberformat" title="ChainNumberFormat ( numberFormat, newTarget, this )"><span class="secnum">15.1.1.1</span> ChainNumberFormat ( <var>numberFormat</var>, <var>newTarget</var>, <var>this</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-setnfdigitoptions" title="SetNumberFormatDigitOptions ( intlObj, options, mnfdDefault, mxfdDefault, notation )"><span class="secnum">15.1.2</span> SetNumberFormatDigitOptions ( <var>intlObj</var>, <var>options</var>, <var>mnfdDefault</var>, <var>mxfdDefault</var>, <var>notation</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-setnumberformatunitoptions" title="SetNumberFormatUnitOptions ( intlObj, options )"><span class="secnum">15.1.3</span> SetNumberFormatUnitOptions ( <var>intlObj</var>, <var>options</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-constructor" title="Properties of the Intl.NumberFormat Constructor"><span class="secnum">15.2</span> Properties of the Intl.NumberFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype" title="Intl.NumberFormat.prototype"><span class="secnum">15.2.1</span> Intl.NumberFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.supportedlocalesof" title="Intl.NumberFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">15.2.2</span> Intl.NumberFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat-internal-slots" title="Internal slots"><span class="secnum">15.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-numberformat-prototype-object" title="Properties of the Intl.NumberFormat Prototype Object"><span class="secnum">15.3</span> Properties of the Intl.NumberFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.constructor" title="Intl.NumberFormat.prototype.constructor"><span class="secnum">15.3.1</span> Intl.NumberFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype-%symbol.tostringtag%" title="Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">15.3.2</span> Intl.NumberFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.format" title="get Intl.NumberFormat.prototype.format"><span class="secnum">15.3.3</span> get Intl.NumberFormat.prototype.format</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formattoparts" title="Intl.NumberFormat.prototype.formatToParts ( value )"><span class="secnum">15.3.4</span> Intl.NumberFormat.prototype.formatToParts ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrange" title="Intl.NumberFormat.prototype.formatRange ( start, end )"><span class="secnum">15.3.5</span> Intl.NumberFormat.prototype.formatRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.formatrangetoparts" title="Intl.NumberFormat.prototype.formatRangeToParts ( start, end )"><span class="secnum">15.3.6</span> Intl.NumberFormat.prototype.formatRangeToParts ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.numberformat.prototype.resolvedoptions" title="Intl.NumberFormat.prototype.resolvedOptions ( )"><span class="secnum">15.3.7</span> Intl.NumberFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-numberformat-instances" title="Properties of Intl.NumberFormat Instances"><span class="secnum">15.4</span> Properties of Intl.NumberFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-numberformat-abstracts" title="Abstract Operations for NumberFormat Objects"><span class="secnum">15.5</span> Abstract Operations for NumberFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-currencydigits" title="CurrencyDigits ( currency )"><span class="secnum">15.5.1</span> CurrencyDigits ( <var>currency</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-number-format-functions" title="Number Format Functions"><span class="secnum">15.5.2</span> Number Format Functions</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumberstring" title="FormatNumericToString ( intlObject, x )"><span class="secnum">15.5.3</span> FormatNumericToString ( <var>intlObject</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberpattern" title="PartitionNumberPattern ( numberFormat, x )"><span class="secnum">15.5.4</span> PartitionNumberPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnotationsubpattern" title="PartitionNotationSubPattern ( numberFormat, x, n, exponent )"><span class="secnum">15.5.5</span> PartitionNotationSubPattern ( <var>numberFormat</var>, <var>x</var>, <var>n</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumber" title="FormatNumeric ( numberFormat, x )"><span class="secnum">15.5.6</span> FormatNumeric ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumbertoparts" title="FormatNumericToParts ( numberFormat, x )"><span class="secnum">15.5.7</span> FormatNumericToParts ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawprecision" title="ToRawPrecision ( x, minPrecision, maxPrecision, unsignedRoundingMode )"><span class="secnum">15.5.8</span> ToRawPrecision ( <var>x</var>, <var>minPrecision</var>, <var>maxPrecision</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-torawfixed" title="ToRawFixed ( x, minFraction, maxFraction, roundingIncrement, unsignedRoundingMode )"><span class="secnum">15.5.9</span> ToRawFixed ( <var>x</var>, <var>minFraction</var>, <var>maxFraction</var>, <var>roundingIncrement</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-unwrapnumberformat" title="UnwrapNumberFormat ( nf )"><span class="secnum">15.5.10</span> UnwrapNumberFormat ( <var>nf</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnumberformatpattern" title="GetNumberFormatPattern ( numberFormat, x )"><span class="secnum">15.5.11</span> GetNumberFormatPattern ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getnotationsubpattern" title="GetNotationSubPattern ( numberFormat, exponent )"><span class="secnum">15.5.12</span> GetNotationSubPattern ( <var>numberFormat</var>, <var>exponent</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponent" title="ComputeExponent ( numberFormat, x )"><span class="secnum">15.5.13</span> ComputeExponent ( <var>numberFormat</var>, <var>x</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-computeexponentformagnitude" title="ComputeExponentForMagnitude ( numberFormat, magnitude )"><span class="secnum">15.5.14</span> ComputeExponentForMagnitude ( <var>numberFormat</var>, <var>magnitude</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-stringintlmv" title="Runtime Semantics: StringIntlMV"><span class="secnum">15.5.15</span> RS: StringIntlMV</a></li><li><span class="item-toggle-none"></span><a href="#sec-tointlmathematicalvalue" title="ToIntlMathematicalValue ( value )"><span class="secnum">15.5.16</span> ToIntlMathematicalValue ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-getunsignedroundingmode" title="GetUnsignedRoundingMode ( roundingMode, sign )"><span class="secnum">15.5.17</span> GetUnsignedRoundingMode ( <var>roundingMode</var>, <var>sign</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-applyunsignedroundingmode" title="ApplyUnsignedRoundingMode ( x, r1, r2, unsignedRoundingMode )"><span class="secnum">15.5.18</span> ApplyUnsignedRoundingMode ( <var>x</var>, <var>r1</var>, <var>r2</var>, <var>unsignedRoundingMode</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-partitionnumberrangepattern" title="PartitionNumberRangePattern ( numberFormat, x, y )"><span class="secnum">15.5.19</span> PartitionNumberRangePattern ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatapproximately" title="FormatApproximately ( numberFormat, result )"><span class="secnum">15.5.20</span> FormatApproximately ( <var>numberFormat</var>, <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-collapsenumberrange" title="CollapseNumberRange ( numberFormat, result )"><span class="secnum">15.5.21</span> CollapseNumberRange ( <var>numberFormat</var>, <var>result</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrange" title="FormatNumericRange ( numberFormat, x, y )"><span class="secnum">15.5.22</span> FormatNumericRange ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-formatnumericrangetoparts" title="FormatNumericRangeToParts ( numberFormat, x, y )"><span class="secnum">15.5.23</span> FormatNumericRangeToParts ( <var>numberFormat</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#pluralrules-objects" title="PluralRules Objects"><span class="secnum">16</span> PluralRules Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-constructor" title="The Intl.PluralRules Constructor"><span class="secnum">16.1</span> The Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules" title="Intl.PluralRules ( [ locales [ , options ] ] )"><span class="secnum">16.1.1</span> Intl.PluralRules ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-constructor" title="Properties of the Intl.PluralRules Constructor"><span class="secnum">16.2</span> Properties of the Intl.PluralRules Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype" title="Intl.PluralRules.prototype"><span class="secnum">16.2.1</span> Intl.PluralRules.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.supportedlocalesof" title="Intl.PluralRules.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">16.2.2</span> Intl.PluralRules.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules-internal-slots" title="Internal slots"><span class="secnum">16.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-pluralrules-prototype-object" title="Properties of the Intl.PluralRules Prototype Object"><span class="secnum">16.3</span> Properties of the Intl.PluralRules Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.constructor" title="Intl.PluralRules.prototype.constructor"><span class="secnum">16.3.1</span> Intl.PluralRules.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype-%symbol.tostringtag%" title="Intl.PluralRules.prototype [ %Symbol.toStringTag% ]"><span class="secnum">16.3.2</span> Intl.PluralRules.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.select" title="Intl.PluralRules.prototype.select ( value )"><span class="secnum">16.3.3</span> Intl.PluralRules.prototype.select ( <var>value</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.selectrange" title="Intl.PluralRules.prototype.selectRange ( start, end )"><span class="secnum">16.3.4</span> Intl.PluralRules.prototype.selectRange ( <var>start</var>, <var>end</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.pluralrules.prototype.resolvedoptions" title="Intl.PluralRules.prototype.resolvedOptions ( )"><span class="secnum">16.3.5</span> Intl.PluralRules.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-pluralrules-instances" title="Properties of Intl.PluralRules Instances"><span class="secnum">16.4</span> Properties of Intl.PluralRules Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-pluralrules-abstracts" title="Abstract Operations for PluralRules Objects"><span class="secnum">16.5</span> Abstract Operations for PluralRules Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselect" title="PluralRuleSelect ( locale, type, s )"><span class="secnum">16.5.1</span> PluralRuleSelect ( <var>locale</var>, <var>type</var>, <var>s</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolveplural" title="ResolvePlural ( pluralRules, n )"><span class="secnum">16.5.2</span> ResolvePlural ( <var>pluralRules</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-pluralruleselectrange" title="PluralRuleSelectRange ( locale, type, xp, yp )"><span class="secnum">16.5.3</span> PluralRuleSelectRange ( <var>locale</var>, <var>type</var>, <var>xp</var>, <var>yp</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-resolvepluralrange" title="ResolvePluralRange ( pluralRules, x, y )"><span class="secnum">16.5.4</span> ResolvePluralRange ( <var>pluralRules</var>, <var>x</var>, <var>y</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#relativetimeformat-objects" title="RelativeTimeFormat Objects"><span class="secnum">17</span> RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat-constructor" title="The Intl.RelativeTimeFormat Constructor"><span class="secnum">17.1</span> The Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat" title="Intl.RelativeTimeFormat ( [ locales [ , options ] ] )"><span class="secnum">17.1.1</span> Intl.RelativeTimeFormat ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-constructor" title="Properties of the Intl.RelativeTimeFormat Constructor"><span class="secnum">17.2</span> Properties of the Intl.RelativeTimeFormat Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype" title="Intl.RelativeTimeFormat.prototype"><span class="secnum">17.2.1</span> Intl.RelativeTimeFormat.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.supportedLocalesOf" title="Intl.RelativeTimeFormat.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">17.2.2</span> Intl.RelativeTimeFormat.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat-internal-slots" title="Internal slots"><span class="secnum">17.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-relativetimeformat-prototype-object" title="Properties of the Intl.RelativeTimeFormat Prototype Object"><span class="secnum">17.3</span> Properties of the Intl.RelativeTimeFormat Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.constructor" title="Intl.RelativeTimeFormat.prototype.constructor"><span class="secnum">17.3.1</span> Intl.RelativeTimeFormat.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype-toStringTag" title="Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]"><span class="secnum">17.3.2</span> Intl.RelativeTimeFormat.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.format" title="Intl.RelativeTimeFormat.prototype.format ( value, unit )"><span class="secnum">17.3.3</span> Intl.RelativeTimeFormat.prototype.format ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-Intl.RelativeTimeFormat.prototype.formatToParts" title="Intl.RelativeTimeFormat.prototype.formatToParts ( value, unit )"><span class="secnum">17.3.4</span> Intl.RelativeTimeFormat.prototype.formatToParts ( <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.relativetimeformat.prototype.resolvedoptions" title="Intl.RelativeTimeFormat.prototype.resolvedOptions ( )"><span class="secnum">17.3.5</span> Intl.RelativeTimeFormat.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-relativetimeformat-instances" title="Properties of Intl.RelativeTimeFormat Instances"><span class="secnum">17.4</span> Properties of Intl.RelativeTimeFormat Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-intl-relativetimeformat--abstracts" title="Abstract Operations for RelativeTimeFormat Objects"><span class="secnum">17.5</span> Abstract Operations for RelativeTimeFormat Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-singularrelativetimeunit" title="SingularRelativeTimeUnit ( unit )"><span class="secnum">17.5.1</span> SingularRelativeTimeUnit ( <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-PartitionRelativeTimePattern" title="PartitionRelativeTimePattern ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.2</span> PartitionRelativeTimePattern ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-makepartslist" title="MakePartsList ( pattern, unit, parts )"><span class="secnum">17.5.3</span> MakePartsList ( <var>pattern</var>, <var>unit</var>, <var>parts</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTime" title="FormatRelativeTime ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.4</span> FormatRelativeTime ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-FormatRelativeTimeToParts" title="FormatRelativeTimeToParts ( relativeTimeFormat, value, unit )"><span class="secnum">17.5.5</span> FormatRelativeTimeToParts ( <var>relativeTimeFormat</var>, <var>value</var>, <var>unit</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#segmenter-objects" title="Segmenter Objects"><span class="secnum">18</span> Segmenter Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-constructor" title="The Intl.Segmenter Constructor"><span class="secnum">18.1</span> The Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter" title="Intl.Segmenter ( [ locales [ , options ] ] )"><span class="secnum">18.1.1</span> Intl.Segmenter ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-constructor" title="Properties of the Intl.Segmenter Constructor"><span class="secnum">18.2</span> Properties of the Intl.Segmenter Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype" title="Intl.Segmenter.prototype"><span class="secnum">18.2.1</span> Intl.Segmenter.prototype</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.supportedlocalesof" title="Intl.Segmenter.supportedLocalesOf ( locales [ , options ] )"><span class="secnum">18.2.2</span> Intl.Segmenter.supportedLocalesOf ( <var>locales</var> [ , <var>options</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter-internal-slots" title="Internal slots"><span class="secnum">18.2.3</span> Internal slots</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-intl-segmenter-prototype-object" title="Properties of the Intl.Segmenter Prototype Object"><span class="secnum">18.3</span> Properties of the Intl.Segmenter Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.constructor" title="Intl.Segmenter.prototype.constructor"><span class="secnum">18.3.1</span> Intl.Segmenter.prototype.constructor</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype-%symbol.tostringtag%" title="Intl.Segmenter.prototype [ %Symbol.toStringTag% ]"><span class="secnum">18.3.2</span> Intl.Segmenter.prototype [ %Symbol.toStringTag% ]</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.segment" title="Intl.Segmenter.prototype.segment ( string )"><span class="secnum">18.3.3</span> Intl.Segmenter.prototype.segment ( <var>string</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-intl.segmenter.prototype.resolvedoptions" title="Intl.Segmenter.prototype.resolvedOptions ( )"><span class="secnum">18.3.4</span> Intl.Segmenter.prototype.resolvedOptions ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-intl-segmenter-instances" title="Properties of Intl.Segmenter Instances"><span class="secnum">18.4</span> Properties of Intl.Segmenter Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-segments-objects" title="Segments Objects"><span class="secnum">18.5</span> Segments Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentsobject" title="CreateSegmentsObject ( segmenter, string )"><span class="secnum">18.5.1</span> CreateSegmentsObject ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentsprototype%-object" title="The %IntlSegmentsPrototype% Object"><span class="secnum">18.5.2</span> The %IntlSegmentsPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%.containing" title="%IntlSegmentsPrototype%.containing ( index )"><span class="secnum">18.5.2.1</span> %IntlSegmentsPrototype%.containing ( <var>index</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentsprototype%-%symbol.iterator%" title="%IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )"><span class="secnum">18.5.2.2</span> %IntlSegmentsPrototype% [ %Symbol.iterator% ] ( )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segments-instances" title="Properties of Segments Instances"><span class="secnum">18.5.3</span> Properties of Segments Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-iterator-objects" title="Segment Iterator Objects"><span class="secnum">18.6</span> Segment Iterator Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentiterator" title="CreateSegmentIterator ( segmenter, string )"><span class="secnum">18.6.1</span> CreateSegmentIterator ( <var>segmenter</var>, <var>string</var> )</a></li><li><span class="item-toggle">+</span><a href="#sec-%intlsegmentiteratorprototype%-object" title="The %IntlSegmentIteratorPrototype% Object"><span class="secnum">18.6.2</span> The %IntlSegmentIteratorPrototype% Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.next" title="%IntlSegmentIteratorPrototype%.next ( )"><span class="secnum">18.6.2.1</span> %IntlSegmentIteratorPrototype%.next ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-%intlsegmentiteratorprototype%.%symbol.tostringtag%" title="%IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]"><span class="secnum">18.6.2.2</span> %IntlSegmentIteratorPrototype% [ %Symbol.toStringTag% ]</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-segment-iterator-instances" title="Properties of Segment Iterator Instances"><span class="secnum">18.6.3</span> Properties of Segment Iterator Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-segment-data-objects" title="Segment Data Objects"><span class="secnum">18.7</span> Segment Data Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-createsegmentdataobject" title="CreateSegmentDataObject ( segmenter, string, startIndex, endIndex )"><span class="secnum">18.7.1</span> CreateSegmentDataObject ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>endIndex</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-intl-segmenter-abstracts" title="Abstract Operations for Segmenter Objects"><span class="secnum">18.8</span> Abstract Operations for Segmenter Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-findboundary" title="FindBoundary ( segmenter, string, startIndex, direction )"><span class="secnum">18.8.1</span> FindBoundary ( <var>segmenter</var>, <var>string</var>, <var>startIndex</var>, <var>direction</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#locale-sensitive-functions" title="Locale Sensitive Functions of the ECMAScript Language Specification"><span class="secnum">19</span> Locale Sensitive Functions of the ECMAScript Language Specification</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-string-prototype-object" title="Properties of the String Prototype Object"><span class="secnum">19.1</span> Properties of the String Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-String.prototype.localeCompare" title="String.prototype.localeCompare ( that [ , locales [ , options ] ] )"><span class="secnum">19.1.1</span> String.prototype.localeCompare ( <var>that</var> [ , <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle">+</span><a href="#sup-string.prototype.tolocalelowercase" title="String.prototype.toLocaleLowerCase ( [ locales ] )"><span class="secnum">19.1.2</span> String.prototype.toLocaleLowerCase ( [ <var>locales</var> ] )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-transform-case" title="TransformCase ( S, locales, targetCase )"><span class="secnum">19.1.2.1</span> TransformCase ( <var>S</var>, <var>locales</var>, <var>targetCase</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sup-string.prototype.tolocaleuppercase" title="String.prototype.toLocaleUpperCase ( [ locales ] )"><span class="secnum">19.1.3</span> String.prototype.toLocaleUpperCase ( [ <var>locales</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-number-prototype-object" title="Properties of the Number Prototype Object"><span class="secnum">19.2</span> Properties of the Number Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-number.prototype.tolocalestring" title="Number.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.2.1</span> Number.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-bigint-prototype-object" title="Properties of the BigInt Prototype Object"><span class="secnum">19.3</span> Properties of the BigInt Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-bigint.prototype.tolocalestring" title="BigInt.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.3.1</span> BigInt.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-date-prototype-object" title="Properties of the Date Prototype Object"><span class="secnum">19.4</span> Properties of the Date Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocalestring" title="Date.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.4.1</span> Date.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaledatestring" title="Date.prototype.toLocaleDateString ( [ locales [ , options ] ] )"><span class="secnum">19.4.2</span> Date.prototype.toLocaleDateString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li><li><span class="item-toggle-none"></span><a href="#sup-date.prototype.tolocaletimestring" title="Date.prototype.toLocaleTimeString ( [ locales [ , options ] ] )"><span class="secnum">19.4.3</span> Date.prototype.toLocaleTimeString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sup-properties-of-the-array-prototype-object" title="Properties of the Array Prototype Object"><span class="secnum">19.5</span> Properties of the Array Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sup-array.prototype.tolocalestring" title="Array.prototype.toLocaleString ( [ locales [ , options ] ] )"><span class="secnum">19.5.1</span> Array.prototype.toLocaleString ( [ <var>locales</var> [ , <var>options</var> ] ] )</a></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#annex-implementation-dependent-behaviour" title="Implementation Dependent Behaviour"><span class="secnum">A</span> Implementation Dependent Behaviour</a></li><li><span class="item-toggle-none"></span><a href="#annex-incompatibilities" title="Additions and Changes That Introduce Incompatibilities with Prior Editions"><span class="secnum">B</span> Additions and Changes That Introduce Incompatibilities with Prior Editions</a></li><li><span class="item-toggle-none"></span><a href="#sec-colophon" title="Colophon"><span class="secnum">C</span> Colophon</a></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">D</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Draft ECMA-402 / December 21, 2024</h1><h1 class="title">ECMAScript® 2025 Internationalization API Specification</h1>
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   <h1>Contributing to this Specification</h1>