Intl.Locale() コンストラクター

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);

let us = new Intl.Locale("en-US");

let locale = new Intl.Locale("en-US", { hourCycle: "h12" });
console.log(locale.hourCycle); // Prints "h12"