Baseline Widely available
The Intl.Locale() constructor creates Intl.Locale objects.
const korean = new Intl.Locale("ko", {
script: "Kore",
region: "KR",
hourCycle: "h23",
calendar: "gregory",
});
const japanese = new Intl.Locale("ja-Jpan-JP-u-ca-japanese-hc-h12");
console.log(korean.baseName, japanese.baseName);
// Expected output: "ko-Kore-KR" "ja-Jpan-JP"
console.log(korean.hourCycle, japanese.hourCycle);
// Expected output: "h23" "h12"
new Intl.Locale(tag)
new Intl.Locale(tag, options)
Note: Intl.Locale() can only be constructed with new. Attempting to call it without new throws a TypeError.
tag
The Unicode locale identifier string. For the syntax of locale identifier strings, see the Intl main page. Note that the Intl.Locale constructor, unlike most other Intl constructors, does not accept an array of locales or undefined.
options
An object that contains configuration for the Locale. Option values here take priority over extension keys in the locale identifier. Possible properties are:
language
The language. Any syntactically valid string following the unicode_language_subtag grammar (2â3 or 5â8 letters) is accepted, but the implementation only recognizes certain kinds.
script
The script. Any syntactically valid string following the unicode_script_subtag grammar (4 letters) is accepted, but the implementation only recognizes certain kinds.
region
The region. Any syntactically valid string following the unicode_region_subtag grammar (either 2 letters or 3 digits) is accepted, but the implementation only recognizes certain kinds.
variants
The variants. It should be a dash (-) separated list of unique variant tags, where each tag is any syntactically valid string following the unicode_variant_subtag grammar (either 5â8 alphanumerals or a digit followed by 3 alphanumerals), but the implementation only recognizes certain kinds.
calendar
The calendar. Any syntactically valid string following the type grammar (one or more segments of 3â8 alphanumerals, joined by hyphens) is accepted, but the implementation only recognizes certain kinds, which are listed in Intl.supportedValuesOf().
collation
The collation. Any syntactically valid string following the type grammar is accepted, but the implementation only recognizes certain kinds, which are listed in Intl.supportedValuesOf().
numberingSystem
The numbering system. Any syntactically valid string following the type grammar is accepted, but the implementation only recognizes certain kinds, which are listed in Intl.supportedValuesOf().
caseFirst
The case-first sort option. Possible values are "upper", "lower", or "false".
hourCycle
The hour cycle. Possible values are "h23", "h12", "h11", or the practically unused "h24", which are explained in Intl.Locale.prototype.getHourCycles
numeric
The numeric sort option. A boolean.
At its very simplest, the Intl.Locale() constructor takes a locale identifier string as its argument:
const us = new Intl.Locale("en-US");
The constructor also takes an optional configuration object argument, which can contain any of several extension types. For example, set the hourCycle property of the configuration object to your desired hour cycle type, and then pass it into the constructor:
const locale = new Intl.Locale("en-US", { hourCycle: "h12" });
console.log(locale.hourCycle); // "h12"
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