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closestTo_index.js.html
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<!DOCTYPE html>
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<title>JSDoc: Source: closestTo/index.js</title>
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<h1 class="page-title">Source: closestTo/index.js</h1>
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<article>
<pre class="prettyprint source linenums"><code>import toDate from '../toDate/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name closestTo
* @category Common Helpers
* @summary Return a date from the array closest to the given date.
*
* @description
* Return a date from the array closest to the given date.
*
* ### v2.0.0 breaking changes:
*
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
*
* - Now, `closestTo` doesn't throw an exception
* when the second argument is not an array, and returns Invalid Date instead.
*
* @param {Date|Number} dateToCompare - the date to compare with
* @param {Date[]|Number[]} datesArray - the array to search
* @returns {Date} the date from the array closest to the given date
* @throws {TypeError} 2 arguments required
*
* @example
* // Which date is closer to 6 September 2015: 1 January 2000 or 1 January 2030?
* var dateToCompare = new Date(2015, 8, 6)
* var result = closestTo(dateToCompare, [
* new Date(2000, 0, 1),
* new Date(2030, 0, 1)
* ])
* //=> Tue Jan 01 2030 00:00:00
*/
export default function closestTo(dirtyDateToCompare, dirtyDatesArray) {
requiredArgs(2, arguments)
var dateToCompare = toDate(dirtyDateToCompare)
if (isNaN(dateToCompare)) {
return new Date(NaN)
}
var timeToCompare = dateToCompare.getTime()
var datesArray
// `dirtyDatesArray` is undefined or null
if (dirtyDatesArray == null) {
datesArray = []
// `dirtyDatesArray` is Array, Set or Map, or object with custom `forEach` method
} else if (typeof dirtyDatesArray.forEach === 'function') {
datesArray = dirtyDatesArray
// If `dirtyDatesArray` is Array-like Object, convert to Array. Otherwise, make it empty Array
} else {
datesArray = Array.prototype.slice.call(dirtyDatesArray)
}
var result
var minDistance
datesArray.forEach(function(dirtyDate) {
var currentDate = toDate(dirtyDate)
if (isNaN(currentDate)) {
result = new Date(NaN)
minDistance = NaN
return
}
var distance = Math.abs(timeToCompare - currentDate.getTime())
if (result == null || distance < minDistance) {
result = currentDate
minDistance = distance
}
})
return result
}
</code></pre>
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