Intl.DisplayNames() constructor

locales

A string with a BCP 47 language tag, or an array of such strings. For the general form and interpretation of the locales argument, see Locale identification and negotiation. The following Unicode extension key is allowed:

nu

The numbering system to be used. Possible values include: "arab", "arabext", "bali", "beng", "deva", "fullwide", "gujr", "guru", "hanidec", "khmr", "knda", "laoo", "latn", "limb", "mlym", "mong", "mymr", "orya", "tamldec", "telu", "thai", "tibt".

options

An object with some or all of the following properties:

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.

style

The formatting style to use, the default is "long".

• "narrow"
• "short"
• "long"

type

The type to use.

• "calendar"
• "currency"
• "dateTimeField"
• "language"
• "region"
• "script"

languageDisplay

The languageDisplay it's only usable along with type language, defaults to dialect.

• "dialect"
• "standard"

fallback

The fallback to use, the default is "code".

• "code"
• "none"

In basic use without specifying a locale, a formatted string in the default locale and with default options is returned.

console.log((new Intl.DisplayNames([], {type: 'language'})).of('US'));
// Expected output: 'us'

Example using dateTimeField as a type option, will return the localized date time names strings.

const dn = new Intl.DisplayNames('pt', {type: 'dateTimeField'});
console.log(dn.of('era')); // logs 'era'
console.log(dn.of('year')); // logs 'ano'
console.log(dn.of('month')); // logs 'mês'
console.log(dn.of('quarter')); // logs 'trimestre'
console.log(dn.of('weekOfYear')); // logs 'semana'
console.log(dn.of('weekday')); // logs 'dia da semana'
console.log(dn.of('dayPeriod')); // logs 'AM/PM'
console.log(dn.of('day')); // logs 'dia'
console.log(dn.of('hour')); // logs 'hora'
console.log(dn.of('minute')); // logs 'minuto'
console.log(dn.of('second')); // logs 'segundo'

Example using calendar as a type option, will return the localized calendar names strings.

const dn = new Intl.DisplayNames('en', {type: 'calendar'});
console.log(dn.of('roc')); // logs 'Minguo Calendar'
console.log(dn.of('gregory')); // logs 'Gregorian Calendar'
console.log(dn.of('chinese')); // logs 'Chinese Calendar'

Example using language as a type with languageDisplay options.

// Using `dialect` option
const dnDialect = new Intl.DisplayNames('en', {type: 'language', languageDisplay: 'dialect'});
console.log(dnDialect.of('en-GB')); // logs 'British English'

// Using `standard` option
const dnStd = new Intl.DisplayNames('en', {type: 'language', languageDisplay: 'standard'});
console.log(dnStd.of('en-GB')); // logs 'English (United Kingdom)'

• Intl.DisplayNames
• Intl.supportedValuesOf()
• Intl