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Viewing file:     index.js (2.29 KB)      -rw-r--r--

import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
 * @name closestIndexTo
 * @category Common Helpers
 * @summary Return an index of the closest date from the array comparing to the given date.
 *
 * @description
 * Return an index of the closest date from the array comparing 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, `closestIndexTo` 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 {Number} an index of the date closest to the given date
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // Which date is closer to 6 September 2015?
 * var dateToCompare = new Date(2015, 8, 6)
 * var datesArray = [
 *   new Date(2015, 0, 1),
 *   new Date(2016, 0, 1),
 *   new Date(2017, 0, 1)
 * ]
 * var result = closestIndexTo(dateToCompare, datesArray)
 * //=> 1
 */

export default function closestIndexTo(dirtyDateToCompare, dirtyDatesArray) {
  requiredArgs(2, arguments);
  var dateToCompare = toDate(dirtyDateToCompare);

  if (isNaN(dateToCompare)) {
    return 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, index) {
    var currentDate = toDate(dirtyDate);

    if (isNaN(currentDate)) {
      result = NaN;
      minDistance = NaN;
      return;
    }

    var distance = Math.abs(timeToCompare - currentDate.getTime());

    if (result == null || distance < minDistance) {
      result = index;
      minDistance = distance;
    }
  });
  return result;
}