How to use 'javascript week number' in JavaScript

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4function getWeek(d) { var a = new Date(d.getFullYear(), 0, 1); return Math.ceil(((d - a) / 864E5 + a.getDay() + 1) / 7); }
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276function formatWeekNumber(num: number, weekLabel: string, locale: Locale, display?: 'numeric' | 'narrow' | 'short'): string {
277 let parts = []
278
279 if (display === 'narrow') {
280 parts.push(weekLabel)
281 } else if (display === 'short') {
282 parts.push(weekLabel, ' ')
283 }
284 // otherwise, considered 'numeric'
285
286 parts.push(locale.simpleNumberFormat.format(num))
287
288 if (locale.options.isRtl) { // TODO: use control characters instead?
289 parts.reverse()
290 }
291
292 return parts.join('')
293}

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