import { toDate } from './toDate.js';

/**
 * @name max
 * @category Common Helpers
 * @summary Return the latest of the given dates.
 *
 * @description
 * Return the latest of the given dates.
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 *
 * @param dates - The dates to compare
 *
 * @returns The latest of the dates
 *
 * @example
 * // Which of these dates is the latest?
 * const result = max([
 *   new Date(1989, 6, 10),
 *   new Date(1987, 1, 11),
 *   new Date(1995, 6, 2),
 *   new Date(1990, 0, 1)
 * ])
 * //=> Sun Jul 02 1995 00:00:00
 */
function max(dates) {
  let result;
  dates.forEach(function (dirtyDate) {
    const currentDate = toDate(dirtyDate);

    if (
      result === undefined ||
      result < currentDate ||
      isNaN(Number(currentDate))
    ) {
      result = currentDate;
    }
  });

  return result || new Date(NaN);
}

export { max as default, max };
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