Web/JavaScript/Reference/Global objects/Intl/PluralRules/supportedLocalesOf

The Intl.PluralRules.supportedLocalesOf() method returns an array containing those of the provided locales that are supported in plural formatting without having to fall back to the runtime's default locale.

Syntax

Intl.PluralRules.supportedLocalesOf(locales[, options])

Parameters

locales: A string with a BCP 47 language tag, or an array of such strings. For the general form of the locales argument, see the Intl page.
options: Optional. An object that may have the following property:

localeMatcher The locale matching algorithm to use. Possible values are lookup and best fit; the default is best fit. For information about this option, see the Intl page.

Return value

An array of strings representing a subset of the given locale tags that are supported in plural formatting without having to fall back to the runtime's default locale.

Description

Returns an array with a subset of the language tags provided in locales. The language tags returned are those for which the runtime supports a locale in plural formatting that the locale matching algorithm used considers a match, so that it wouldn't have to fall back to the default locale.

Examples

Using supportedLocalesOf()

Assuming a runtime that supports Indonesian and German but not Balinese in plural formatting, supportedLocalesOf returns the Indonesian and German language tags unchanged, even though pinyin collation is neither relevant to plural formatting nor used with Indonesian, and a specialized German for Indonesia is unlikely to be supported. Note the specification of the lookup algorithm here — a best fit matcher might decide that Indonesian is an adequate match for Balinese since most Balinese speakers also understand Indonesian, and therefore return the Balinese language tag as well.

var locales = ['ban', 'id-u-co-pinyin', 'de-ID'];
var options = { localeMatcher: 'lookup' };
console.log(Intl.PluralRules.supportedLocalesOf(locales, options).join(', '));
// → "id-u-co-pinyin, de-ID"

Specifications

Specification

ECMAScript Internationalization API (ECMA-402)The definition of 'Intl.PluralRules.supportedLocalesOf' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`supportedLocalesOf`	Chrome Full support 63	Edge Full support 18	Firefox Full support 58	IE No support No	Opera Full support 50	Safari Full support 13	WebView Android Full support 63	Chrome Android Full support 63	Firefox Android Full support 58	Opera Android Full support 46	Safari iOS Full support 13	Samsung Internet Android Full support 8.0	nodejs Full support 10.0.0 Notes' Full support 10.0.0 Notes' Notes' Before version 13.0.0, only the locale data for `en-US` is available by default. See the `PluralRules()` constructor for more details.

Legend

Full support: Full support
No support: No support
See implementation notes.': See implementation notes.