Baseline Widely available
Intl.Locale.prototype.caseFirst
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let locale = new Intl.Locale("fr-Latn-FR-u-kf-upper");
console.log(locale.caseFirst); // "upper" ã¨è¡¨ç¤º
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Intl.Locale
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let locale = new Intl.Locale("en-Latn-US", { caseFirst: "lower" });
console.log(locale.caseFirst); // "lower" ã¨è¡¨ç¤º
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