与えられた日時のリストから、各日付で最新のものだけを一つづつ取り出したリストを作る

のformatで、切り出し内容の更新日時を

import { isSameDay, getYear, getMonth, getDate } from "../date-fns/mod.ts";

export const getEachLatestDate = (dates: Date[]): Date[] => {
  const map = new Map<`${number}-${number}-${number}`, Date>();
  
  for (const date of dates) {
    const key = `${getYear(date)}-${getMonth(date)}-${getDate(date)}` as const;
    const sameDate = map.get(key);
    if (sameDate && sameDate.getTime() > date.getTime()) continue;
    map.set(key, date);
  }
  
  return [...map.values()];
};
 