Intl.DisplayNames.prototype.resolvedOptions()

The Intl.DisplayNames.prototype.resolvedOptions() method returns a new object with properties reflecting the locale and style formatting options computed during the construction of the current Intl/DisplayNames object.

displayNames.resolvedOptions()

An object with properties reflecting the locale and formatting options computed during the construction of the given Intl/DisplayNames object.

The object returned by resolvedOptions() has the following properties:

locale

The BCP 47 language tag for the locale actually used. If any Unicode extension values were requested in the input BCP 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale.

style

The value provided for this property in the options argument of the constructor or the default value ("long"). Its value is either "long", "short", or "narrow".

type

The value provided for this property in the options argument of the constructor or the default value ("language"). Its value is either "language", "region", "script", or "currency".

fallback

The value provided for this property in the options argument of the constructor or the default value ("code"). Its value is either "code" or "none".

const displayNames = new Intl.DisplayNames(['de-DE'], {type: 'region'});

const usedOptions = displayNames.resolvedOptions();
console.log(usedOptions.locale);   // "de-DE"
console.log(usedOptions.style);    // "long"
console.log(usedOptions.type);     // "region"
console.log(usedOptions.fallback); // "code"

• Intl.DisplayNames