48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
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var parse = require('../parse/index.js')
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/**
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* @category Common Helpers
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* @summary Return a date from the array closest to the given date.
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*
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* @description
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* Return a date from the array closest to the given date.
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*
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* @param {Date|String|Number} dateToCompare - the date to compare with
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* @param {Date[]|String[]|Number[]} datesArray - the array to search
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* @returns {Date} the date from the array closest to the given date
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* @throws {TypeError} the second argument must be an instance of Array
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*
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* @example
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* // Which date is closer to 6 September 2015: 1 January 2000 or 1 January 2030?
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* var dateToCompare = new Date(2015, 8, 6)
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* var result = closestTo(dateToCompare, [
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* new Date(2000, 0, 1),
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* new Date(2030, 0, 1)
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* ])
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* //=> Tue Jan 01 2030 00:00:00
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*/
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function closestTo (dirtyDateToCompare, dirtyDatesArray) {
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if (!(dirtyDatesArray instanceof Array)) {
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throw new TypeError(toString.call(dirtyDatesArray) + ' is not an instance of Array')
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}
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var dateToCompare = parse(dirtyDateToCompare)
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var timeToCompare = dateToCompare.getTime()
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var result
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var minDistance
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dirtyDatesArray.forEach(function (dirtyDate) {
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var currentDate = parse(dirtyDate)
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var distance = Math.abs(timeToCompare - currentDate.getTime())
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if (result === undefined || distance < minDistance) {
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result = currentDate
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minDistance = distance
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}
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})
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return result
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}
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module.exports = closestTo
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