" de-DE-u-co-phonebk": Use the phonebook variant of the German sort order, which interprets umlauted vowels as corresponding character pairs: ä → ae, ö → oe, ü → ue.
The "u" (Unicode) extension can be used to request additional customization of Intl.Collator, Intl.NumberFormat, or Intl.DateTimeFormat objects. Currently only two extensions have defined semantics: BCP 47 extension subtags are defined in the Unicode CLDR Project. Only one sequence is permitted for each digit or letter: " de-a-foo-a-foo" is invalid. This registry is periodically updated over time, and implementations may not always be up to date, so don't rely too much on subtags being universally supported.īCP 47 extension sequences consist of a single digit or letter (other than "x") and one or more two- to eight-letter or digit subtags separated by hyphens. Subtags identifying languages, scripts, regions (including countries), and (rarely used) variants are registered in the IANA Language Subtag Registry. " en-emodeng": English (language) in the "Early modern English" dialect (variant). " zh-Hans-CN": Chinese (language) written in simplified characters (script) as used in China (region). " de-AT": German (language) as used in Austria (region). However, it's conventional to use title case (first letter capitalized, successive letters lower case) for script subtags, upper case for region subtags, and lower case for everything else. 
Locale identifiers are case-insensitive ASCII. with all present subtags and sequences separated by hyphens.
(optionally) a private-use extension sequence. (optionally) one or more BCP 47 extension sequences, and. (optionally) one or more variant subtags (all of which must be unique),. (optionally) a region (or country) subtag,. In the latter two cases, the actual locale used is the best-supported locale determined by locale negotiation.Ī locale identifier is a string that consists of: A list of locales: Any other value, that will be converted into an object and then treated as an array of locales. A locale: A locale identifier or an Intl.Locale object that wraps a locale identifier. undefined (or omitted): The implementation's default locale will be used. The JavaScript implementation examines locales, and then computes a locale it understands that comes closest to satisfying the expressed preference. So we will have to resort to the trim method to avoid extra spaces.The locales argument is used to determine the locale used in a given operation. 
… what we’ll get will be the following: First Second Of course, it’s important to remember the spaces aren’t removed, so if we create a string as follows … const string = `First line Second line` However, with backticks we can write the following: const html = ` Article title `
Stack OverflowĪnother option is to use the + operator: const html = '' + 'Article title' + '' The whitespace at the beginning of each line can’t be safely stripped at compile time whitespace after the slash will result in tricky errors and while most script engines support this, it is not part of ECMAScript. The alternative we had until ECMA2015 was to use the new line character ( \n ): const html = " \ Article title \ " īut that nonetheless brings problems at compile time: Which is quite awkward, especially when we are creating HTML. We get the following error: Synta圎rror: "" string literal contains an unescaped line break For example, if we try the following: const html = " Article title " In JavaScript, it’s not possible to declare strings on several lines.
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