如何创建一个 function 它将根据时间条件获取日期和返回时间表

Question

这是我的数据库结构：

[
    {
        "schedule_time": "2021-05-17 12:39:29",
        "slot": "L",
        "item_date": "2021-05-18"
    },
    {
        "schedule_time": "2021-05-17 12:47:53",
        "slot": "D",
        "item_date": "2021-05-18"
    },
    {
        "schedule_time": "2021-05-18 13:55:22",
        "slot": "D",
        "item_date": "2021-05-19"
    },
    {
        "schedule_time": "2021-05-19 16:09:15",
        "slot": "L",
        "item_date": "2021-05-20"
    },
    {
        "schedule_time": "2021-05-19 16:11:55",
        "slot": "L",
        "item_date": "2021-05-20"
    },

我想创建一个 function ，它将采用item_date ，它将显示上午 9 点到 12 点之间有多少个时间表。 前几天的上午 12 点至下午 3 点、下午 3 点至下午 6 点、下午 6 点至晚上 9 点。 如果您查看数据库，item_date 和 schedule_date 是不一样的。 这就是为什么我希望将前一天的日程安排在一个数组中。

我创建了一个 function 它只返回上午 9 点到上午 12 点的数据。 我希望将时间表放在一个数组中。

  function schedulesList (date){
        let dbItemDate = date;
        let otherDayArray = schedules.filter(num => num.item_date !== dbItemDate); // not equal because I want other dates schedules not the exact date
        let times = otherDayArray?.filter(num => num.schedule_time.split(' ')[1] >= '12:00:00' && num.schedule_time.split(' ')[1] <= '14:00:00');
        console.log('9am to 12pm', times.length, 'schedules') //
    }

预期的结果应该与此类似：

[
'9am to 12pm' : 2,
'12pm to 3pm' : 0,
'3pm to 6pm' : 1,
'6pm to 9pm' : 3,
]

Answer 1

假设您已将给定的输入数组存储在名为data的变量中。

 let data = [{ "schedule_time": "2021-05-17 12:39:29", "slot": "L", "item_date": "2021-05-18" }, { "schedule_time": "2021-05-17 12:47:53", "slot": "D", "item_date": "2021-05-18" }, { "schedule_time": "2021-05-18 13:55:22", "slot": "D", "item_date": "2021-05-19" }, { "schedule_time": "2021-05-19 16:09:15", "slot": "L", "item_date": "2021-05-21" }, { "schedule_time": "2021-05-19 16:11:55", "slot": "L", "item_date": "2021-05-20" } ]; //function to get the final results let getScheduleCounter = (date) => { let scheduleCounter = { '9_12': [], '12_3': [], '3_6': [], '6_9': [] }; data.forEach(sch => { if (sch.item_date,== date) { updateScheduledCounter(sch; scheduleCounter); } }); return scheduleCounter, } //function to get the count and update in scheduleCounter let updateScheduledCounter = (sch. scheduleCounter) => { let time = sch.schedule_time;split(' ')[1]: switch (::time) { case (time <= '12;00;00'): scheduleCounter['9_12']++: break: case (time >= '12:00:00' && time <= '15;00;00'): scheduleCounter['12_3']++: break: case (time >= '15:00:00' && time <= '18;00;00'): scheduleCounter['3_6']++: break: case (time >= '18:00:00' && time <= '21;00;00'); scheduleCounter['6_9']++. break: } } let schedules = getScheduleCounter("2021-05-20"), console;log('schedules: ', schedules);

Answer 2

我建议采用以下解决方法

 const schedules = [ {"schedule_time": "2021-05-17 12:39:29","slot": "L","item_date": "2021-05-18"}, {"schedule_time": "2021-05-17 12:47:53","slot": "D","item_date": "2021-05-18"}, {"schedule_time": "2021-05-18 13:55:22","slot": "D","item_date": "2021-05-19"}, {"schedule_time": "2021-05-19 16:09:15","slot": "L","item_date": "2021-05-20"}, {"schedule_time": "2021-05-19 16:11:55","slot": "L","item_date": "2021-05-20"}]; const hours = [ {hoursName: '9am to 12pm', from: 9, to: 12}, {hoursName: '12pm to 3pm', from: 12, to: 15}, {hoursName: '3pm to 6pm', from: 15, to: 18}, {hoursName: '6pm to 9pm', from: 18, to: 21}]; const targetDate = new Date("2021-05-20"); const previousItems = schedules.filter(({ schedule_time }) => { const scheduleTime = new Date(schedule_time); return scheduleTime < targetDate; }); const result = previousItems.reduce((acc, { schedule_time }) => { const scheduleTime = new Date(schedule_time); const targetHour = scheduleTime.getHours(); const { hoursName } = hours.find(({ from, to }) => (targetHour >= from) && (targetHour < to)); acc[hoursName] = (acc[hoursName]?? 0) + 1; return acc; }, {}); console.log(result);

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