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Intl.Locale.prototype.caseFirst - JavaScript | MDN
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  2. JavaScript
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  6. Intl.Locale
  7. Intl.Locale.prototype.caseFirst
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Intl.Locale.prototype.caseFirst

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2020 9.

Intl.Locale caseFirst / .

In this article

. . Intl.Locale caseFirst .

caseFirst 3 .

caseFirst

upper .
lower .
false .

caseFirst

caseFirst kf . kf " " . , -u . caseFirst Locale . caseFirst -u . caseFirst -kf . caseFirst .

js
const locale = new Intl.Locale("fr-Latn-FR-u-kf-upper");
console.log(locale.caseFirst); // Prints "upper"

caseFirst

Intl.Locale() . caseFirst caseFirst .

js
const locale = new Intl.Locale("en-Latn-US", { caseFirst: "lower" });
console.log(locale.caseFirst); // Prints "lower"

Specification
ECMAScript 2027 Internationalization API Specification
# sec-Intl.Locale.prototype.caseFirst

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  2. Intl.Locale
    1. Intl.Locale()
    1. Intl.Locale.prototype.getCalendars()
    2. getCollations()
    3. Intl.Locale.prototype.getHourCycles()
    4. getNumberingSystems()
    5. Intl.Locale.prototype.getTextInfo()
    6. Intl.Locale.prototype.getTimeZones()
    7. Intl.Locale.prototype.getWeekInfo()
    8. maximize()
    9. minimize()
    10. toString()
    1. Intl.Locale.prototype.baseName
    2. Intl.Locale.prototype.calendar
    3. Intl.Locale.prototype.caseFirst
    4. collation
    5. Intl.Locale.prototype.hourCycle
    6. Intl.Locale.prototype.language
    7. Intl.Locale.prototype.numberingSystem
    8. numeric
    9. Intl.Locale.prototype.region
    10. script
    11. variants
  7. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype[@@hasInstance]()
    1. Function: displayName
    2. Function.prototype.length
    3. Function: name
    4. Function
    5. Function.arguments
    6. Function.prototype.caller
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
  13. Intl
  14. Intl.Collator
  15. Intl.DateTimeFormat
  16. Intl.DisplayNames
  17. Intl.DurationFormat
  18. Intl.ListFormat
  19. Intl.NumberFormat
  20. Intl.PluralRules
  21. Intl.RelativeTimeFormat
  22. Intl.Segmenter
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