API đa ngôn ngữ của Javascript

// chuỗi tiếng Đức
console.log(['Z', 'a', 'z', 'ä'].sort(new Intl.Collator('de').compare));
// ["a", "ä", "z", "Z"]

const words = ['Congrès', 'congres', 'Assemblée', 'poison']
const searchTerm = 'congres'

const collator = new Intl.Collator('fr', {
	usage: 'search',
	sensitivity: 'base'
})

const matches = words.filter(word => collator.compare(word, searchTerm) === 0)

console.log(matches)
// 'Congrès', 'congres'

const rtf = new Intl.RelativeTimeFormat('en', {
	localeMatcher: 'best fit', // giá trị khác 'lockup'
	numeric: 'always', // hoặc 'auto'
	style: 'long', // hoặc 'sort', 'narrow'
})

// định dạng relative time bằng giá trị âm
rtf.format(-1, 'day')
// '1 day ago'

// định dạng relative time bằng giá trị dương
rtf.format(1, 'day')
// 'in 1 day'

const rtf = new Intl.RelativeTimeFormat('en',
	{
		numeric: 'auto'
	})

rtf.format(-1, 'day')
// => yesterday

rtf.format(0, 'day')
// => today

rft.format(1, 'day')
// => tomorrow

const number = 123456.789

new Intl.NumberFormat('de-DE',
	{ style: 'currency', currency: 'EUR' }).format(number)
// => 123.456,79 €

new Intl.NumberFormat('ja-JP',
	{ style: 'currency', currency: 'JPY' }).format(number)
// => ¥123457

new Intl.NumberFormat('en-IN',
	{ maximumSignificantDigits: 3 }).format(number)
// => 1,23,0000

let amount = 3500

new Intl.NumberFormat('en-US', { style: 'decimal' }).format(amount)
// => 3,500

new Intl.NumberFormat('en-US', { style: 'percent' }).format(amount)
// => 350,000%

new Intl.NumberFormat('en-US', {
	style: 'percent',
	signDisplay: 'exceptZero'
}).format(0.55)
// => +55%

let amount = 3500

new Intl.NumberFormat('en-US', { style: 'unit', unit: 'liter' })
	.format(amount)
// => 3,500 L

new Intl.NumberFormat('en-US', { style: 'unit', unit: 'liter', unitDisplay: 'long' })
	.format(amount)
// => 3,500 liters

const numbers = [123456.789, 987654.321, 456789.123]
const numberFormat = new Intl.NumberFormat('es-ES')
const formatted = numbers.map(n => numberFormat.format(n))

formatted.join('; ')
// => 123.456,789; 987.654,321; 456.789,123 

const vehicles = ['Motorcycle', 'Bus', 'Car']
new Intl.ListFormat('en', {
	style: 'long',
	type: 'conjunction'
}).format(vehicles)
// => Motocycle, Bus, and Car

new Intl.ListFormat('de', {
	style: 'short',
	type: 'disjunction'
}).format(vehicles)
// => Motocycle, Bus oder Car

let lgNames = new Intl.DisplayNames(['en'], { type: 'language' })

lgNames.of('fr') // => French
lgNames.of('zh-Hant') // => Traditional Chinese

let lgNames2 = new Intl.DisplayNames(['zh-Hant'], { type: 'language' })
lgNames2.of('fr') // => 法文
lgNames2.of('zh-Hant') // => 繁體中文

const options1 = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' }
const date1 = new Date(2012, 5)

const dateTimeFormat1 = new Intl.DateTimeFormat('sr-RS', options1)
console.log(dateTimeFormat1.format(date1))
// => петак, 1. јун 2012.

const dateTimeFormat2 = new Intl.DateTimeFormat('en-GB', options1)
console.log(dateTimeFormat2.format(date1))
// => Friday, 1 June 2012

let dtf = new Intl.DateTimeFormat('en', {
	timeStyle: 'short'
})
console.log(dtf.format(Date.now()))
// => 13:31 AM

dtf = new Intl.DateTimeFormat('en', {
	dateStyle: 'short'
})
console.log(dtf.format(Date.now()))
// => 07/07/20

dtf = new Intl.DateTimeFormat('en', {
	timeStyle: 'medium',
	dateStyle: 'short'
})
console.log(dtf.format(Date.now()))
// => 07/07/20, 13:31:55 AM

new Intl.PluralRules('ar-EG').select(0)
// => zero
new Intl.PluralRules('ar-EG').select(1)
// => one
new Intl.PluralRules('ar-EG').select(2)
// => two
new Intl.PluralRules('ar-EG').select(6)
// => few
new Intl.PluralRules('ar-EG').select(18)
// => many

const pluralRules = new Intl.PluralRules('en-US')
const pluralize = (count, singular, plural) => {
	const grammaticalNumber = pluralRules.select(count);
	switch (grammaticalNumber ) {
		case 'one':
			return count + ' ' + singular
		case 'other':
			return count + ' ' + plural
		default:
			throw new Error('Unknow: ' + grammaticalNumber )
	}
}

const report = count => {
	return `${pluralize(count, 'file was', 'files were')} changed`
}

report(0) // 0 files were changed
report(1) // 1 file was changed
report(2) // 2 files ware changed