41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
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/**
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* @name constructFrom
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* @category Generic Helpers
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* @summary Constructs a date using the reference date and the value
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*
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* @description
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* The function constructs a new date using the constructor from the reference
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* date and the given value. It helps to build generic functions that accept
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* date extensions.
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*
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* It defaults to `Date` if the passed reference date is a number or a string.
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*
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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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*
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* @param date - The reference date to take constructor from
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* @param value - The value to create the date
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*
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* @returns Date initialized using the given date and value
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*
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* @example
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* import { constructFrom } from 'date-fns'
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*
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* // A function that clones a date preserving the original type
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* function cloneDate<DateType extends Date(date: DateType): DateType {
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* return constructFrom(
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* date, // Use contrustor from the given date
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* date.getTime() // Use the date value to create a new date
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* )
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* }
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*/
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export function constructFrom(date, value) {
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if (date instanceof Date) {
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return new date.constructor(value);
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} else {
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return new Date(value);
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}
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}
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// Fallback for modularized imports:
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export default constructFrom;
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