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import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
* @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 {Array<Date> | Array<number>} datesArray - the array to search
* @returns {Date | undefined} the date from the array closest to the given date or undefined if no valid value is given
* @throws {TypeError} 2 arguments required
*
* @example
* // Which date is closer to 6 September 2015: 1 January 2000 or 1 January 2030?
* const dateToCompare = new Date(2015, 8, 6)
* const 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(Number(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(Number(currentDate))) {
result = new Date(NaN);
minDistance = NaN;
return;
}
var distance = Math.abs(timeToCompare - currentDate.getTime());
if (result == null || distance < Number(minDistance)) {
result = currentDate;
minDistance = distance;
}
});
return result;
}
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