text: "use strict";
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = closestIndexTo;
  
  var _index = _interopRequireDefault(require("../toDate/index.js"));
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  /**
   * @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
   */
  function closestIndexTo(dirtyDateToCompare, dirtyDatesArray) {
    if (arguments.length < 2) {
      throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
    }
  
    var dateToCompare = (0, _index.default)(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 = (0, _index.default)(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;
  }
  
  module.exports = exports.default;