Locale Matching
- @formatjs/intl-localematcher:
@formatjs/intl-localematcherprovides a simple and efficient way to match a list of locales against a user's preferred locales. It uses thebest-fitalgorithm to select the most appropriate locale, making it easy to implement locale negotiation in your application. - intl-messageformat:
intl-messageformatdoes not handle locale matching directly, as its primary focus is on formatting messages. However, it can be used in conjunction with locale matching libraries to format messages in the selected locale. - intl-relativeformat:
intl-relativeformatalso does not handle locale matching. It relies on the locale being provided to format relative time expressions correctly.
Message Formatting
- @formatjs/intl-localematcher:
@formatjs/intl-localematcherdoes not perform message formatting, as it is solely focused on locale matching. - intl-messageformat:
intl-messageformatexcels at formatting messages with placeholders, supporting complex features like pluralization, gender, and nested messages. It uses ICU (International Components for Unicode) syntax, allowing for highly customizable and locale-aware message formatting. - intl-relativeformat:
intl-relativeformatspecializes in formatting relative time expressions, providing a simple API to create context-aware relative time strings. It is designed for formatting time intervals relative to the current time, making it a great complement to other message formatting libraries.
Pluralization Support
- @formatjs/intl-localematcher:
@formatjs/intl-localematcherdoes not provide pluralization support, as it is not within its scope. - intl-messageformat:
intl-messageformatprovides robust pluralization support based on the rules defined in the CLDR (Common Locale Data Repository). It allows developers to define different message formats for singular, plural, and other quantity categories, making it highly flexible for languages with complex pluralization rules. - intl-relativeformat:
intl-relativeformatdoes not handle pluralization directly, as its focus is on relative time formatting. However, it can be used alongside pluralization-aware libraries to create more complex time-related messages.
Relative Time Formatting
- @formatjs/intl-localematcher:
@formatjs/intl-localematcherdoes not provide relative time formatting capabilities. - intl-messageformat:
intl-messageformatcan handle relative time formatting if the messages are defined to include relative time expressions. However, it does not provide built-in support for formatting relative time. - intl-relativeformat:
intl-relativeformatis specifically designed for formatting relative time expressions. It provides a simple and efficient way to create relative time strings based on the time difference between two dates, making it ideal for applications that need to display time intervals in a user-friendly manner.
Ease of Use: Code Examples
- @formatjs/intl-localematcher:
Locale matching example using
@formatjs/intl-localematcherimport { bestFitLocaleMatcher } from '@formatjs/intl-localematcher'; const availableLocales = ['en-US', 'fr-FR', 'es-ES']; const userLocales = ['fr-CA', 'en-GB']; const matchedLocale = bestFitLocaleMatcher(userLocales, availableLocales); console.log(matchedLocale); // Output: 'fr-FR' - intl-messageformat:
Message formatting example using
intl-messageformatimport { MessageFormat } from 'intl-messageformat'; const message = new MessageFormat('Hello {name}, you have {count, plural, =0 {no messages} =1 {one message} other {# messages}}.', 'en'); const formattedMessage = message.format({ name: 'Alice', count: 2 }); console.log(formattedMessage); // Output: 'Hello Alice, you have 2 messages.' - intl-relativeformat:
Relative time formatting example using
intl-relativeformatimport { RelativeTimeFormat } from 'intl-relativeformat'; const rtf = new RelativeTimeFormat('en'); const formattedTime = rtf.format(-3, 'day'); console.log(formattedTime); // Output: '3 days ago'