Marc Mintel
5397309103
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62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
"use strict";
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exports.eachYearOfInterval = eachYearOfInterval;
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var _index = require("./toDate.js");
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/**
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* The {@link eachYearOfInterval} function options.
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*/
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/**
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* @name eachYearOfInterval
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* @category Interval Helpers
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* @summary Return the array of yearly timestamps within the specified time interval.
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*
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* @description
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* Return the array of yearly timestamps within the specified time interval.
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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 interval - The interval.
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*
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* @returns The array with starts of yearly timestamps from the month of the interval start to the month of the interval end
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*
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* @example
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* // Each year between 6 February 2014 and 10 August 2017:
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* const result = eachYearOfInterval({
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* start: new Date(2014, 1, 6),
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* end: new Date(2017, 7, 10)
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* })
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* //=> [
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* // Wed Jan 01 2014 00:00:00,
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* // Thu Jan 01 2015 00:00:00,
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* // Fri Jan 01 2016 00:00:00,
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* // Sun Jan 01 2017 00:00:00
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* // ]
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*/
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function eachYearOfInterval(interval, options) {
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const startDate = (0, _index.toDate)(interval.start);
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const endDate = (0, _index.toDate)(interval.end);
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let reversed = +startDate > +endDate;
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const endTime = reversed ? +startDate : +endDate;
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const currentDate = reversed ? endDate : startDate;
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currentDate.setHours(0, 0, 0, 0);
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currentDate.setMonth(0, 1);
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let step = options?.step ?? 1;
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if (!step) return [];
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if (step < 0) {
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step = -step;
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reversed = !reversed;
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}
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const dates = [];
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while (+currentDate <= endTime) {
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dates.push((0, _index.toDate)(currentDate));
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currentDate.setFullYear(currentDate.getFullYear() + step);
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}
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return reversed ? dates.reverse() : dates;
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}
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