The Intl API provides language-sensitive formatting and comparison. Here's how to use it.
Number Formatting#
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Percentage and Units#
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Date and Time Formatting#
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Relative Time#
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List Formatting#
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Plural Rules#
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Collation (Sorting)#
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Display Names#
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Segmenter#
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Best Practices#
Usage:
✓ Cache formatters for reuse
✓ Handle missing locale gracefully
✓ Use formatToParts for custom rendering
✓ Test with multiple locales
Performance:
✓ Create formatters once, reuse
✓ Use appropriate precision
✓ Avoid creating in loops
✓ Consider memoization
Fallbacks:
✓ Provide default locale
✓ Handle unsupported features
✓ Test browser compatibility
✓ Use polyfills if needed
Conclusion#
The Intl API provides comprehensive internationalization support. Use it for numbers, dates, lists, and sorting. Cache formatter instances for performance and test with various locales to ensure proper display across regions.