在 javascript 中按星期几过滤 ISO 日期数组

Question

我有一系列 ISO 日期，我正在尝试对其进行排序并从中获取接下来的 7 天

这是示例

 Here is the sample code daysdata = [{time: '2022-01-23T11:00:00Z', data: {…}}, {time: '2022-01-23T12:00:00Z', data: {…}}, {time: '2022-01-24T11:00:00Z', data: {…}}, {time: '2022-01-24T12:00:00Z', data: {…}}, {time: '2022-01-24T17:00:00Z', data: {…}}, {time: '2022-01-24T23:00:00Z', data: {…}}, {time: '2022-01-25T00:00:00Z', data: {…}}, {time: '2022-01-25T04:00:00Z', data: {…}}, {time: '2022-01-25T05:00:00Z', data: {…}}, {time: '2022-01-25T06:00:00Z', data: {…}}, {time: '2022-01-25T07:00:00Z', data: {…}}, {time: '2022-01-25T14:00:00Z', data: {…}}, {time: '2022-01-25T15:00:00Z', data: {…}}, {time: '2022-01-26T13:00:00Z', data: {…}}, {time: '2022-01-26T14:00:00Z', data: {…}}, {time: '2022-01-26T15:00:00Z', data: {…}}, {time: '2022-01-27T13:00:00Z', data: {…}}, {time: '2022-01-27T14:00:00Z', data: {…}}, {time: '2022-01-27T15:00:00Z', data: {…}}, {time: '2022-01-28T14:00:00Z', data: {…}}, {time: '2022-01-28T15:00:00Z', data: {…}}, {time: '2022-01-28T16:00:00Z', data: {…}}, {time: '2022-01-29T18:00:00Z', data: {…}}, {time: '2022-01-29T19:00:00Z', data: {…}}, {time: '2022-01-30T08:00:00Z', data: {…}}, {time: '2022-01-30T09:00:00Z', data: {…}}, {time: '2022-01-30T10:00:00Z', data: {…}}, {time: '2022-01-30T11:00:00Z', data: {…}}, ]

那是示例代码。

Answer 1

只需按 Array.sort 排序并按 Array.slice 选择数组的前 n 个元素

 daysdata = [{time: '2022-01-23T11:00:00Z', data: {}}, {time: '2022-01-23T12:00:00Z', data: {}}, {time: '2022-01-24T11:00:00Z', data: {}}, {time: '2022-01-24T12:00:00Z', data: {}}, {time: '2022-01-24T17:00:00Z', data: {}}, {time: '2022-01-24T23:00:00Z', data: {}}, {time: '2022-01-25T00:00:00Z', data: {}}, {time: '2022-01-25T04:00:00Z', data: {}}, {time: '2022-01-25T05:00:00Z', data: {}}, {time: '2022-01-25T06:00:00Z', data: {}}, {time: '2022-01-25T07:00:00Z', data: {}}, {time: '2022-01-25T14:00:00Z', data: {}}, {time: '2022-01-25T15:00:00Z', data: {}}, {time: '2022-01-26T13:00:00Z', data: {}}, {time: '2022-01-26T14:00:00Z', data: {}}, {time: '2022-01-26T15:00:00Z', data: {}}, {time: '2022-01-27T13:00:00Z', data: {}}, {time: '2022-01-27T14:00:00Z', data: {}}, {time: '2022-01-27T15:00:00Z', data: {}}, {time: '2022-01-28T14:00:00Z', data: {}}, {time: '2022-01-28T15:00:00Z', data: {}}, {time: '2022-01-28T16:00:00Z', data: {}}, {time: '2022-01-29T18:00:00Z', data: {}}, {time: '2022-01-29T19:00:00Z', data: {}}, {time: '2022-01-30T08:00:00Z', data: {}}, {time: '2022-01-30T09:00:00Z', data: {}}, {time: '2022-01-30T10:00:00Z', data: {}}, {time: '2022-01-30T11:00:00Z', data: {}}, ]; sortData = daysdata.sort((a,b) => (a.time < b.time)? 1: ((b.time < a.time)? -1: 0)); console.log(sortData.slice(0,7));

Answer 2

一个算法是：

1. 按时间属性的值对数据进行排序
2. 查找时间等于或晚于提供的日期的第一天的索引（默认为当前日期）
3. 查找时间等于或晚于当前日期 + n 天的第一天的索引
4. 获取从第一个索引到第二个索引的所有条目减 1

词法排序用于按时间排序并查找要返回的记录，因为它是 ISO 8601 字符串。 转换为 Date 对象也可以，但这似乎没有必要。

对于比较字符串，本地时间使用setHours设置为一天的开始。 如果这不适合，请更改它。

例如

 function getNextNDays(data, n, date = new Date()) { data.sort((a, b) => a.time.localeCompare(b.time)); let d = new Date(date); d.setHours(0,0,0,0); let startDate = d.toISOString(); d.setDate(d.getDate() + Number(n)); let endDate = d.toISOString(); let startIndex = data.findIndex(obj => obj.time >= startDate); let endIndex = data.findIndex(obj => obj.time >= endDate); // If no suitable record found for start, return if (startIndex == -1) return []; if (endIndex == -1) endIndex = data.length; // Debug console.log(`Extracting data for ${endIndex - startIndex} records from: ` + `\n${startDate} to \n${endDate}`); // Return array of selected values return data.slice(startIndex, endIndex); } let daysdata = [ {time: '2022-01-20T11:00:00Z', data: {}}, {time: '2022-01-23T11:00:00Z', data: {}}, {time: '2022-01-23T12:00:00Z', data: {}}, {time: '2022-01-24T11:00:00Z', data: {}}, {time: '2022-01-24T12:00:00Z', data: {}}, {time: '2022-01-24T17:00:00Z', data: {}}, {time: '2022-01-24T23:00:00Z', data: {}}, {time: '2022-01-25T00:00:00Z', data: {}}, {time: '2022-01-25T04:00:00Z', data: {}}, {time: '2022-01-25T05:00:00Z', data: {}}, {time: '2022-01-25T06:00:00Z', data: {}}, {time: '2022-01-25T07:00:00Z', data: {}}, {time: '2022-01-25T14:00:00Z', data: {}}, {time: '2022-01-25T15:00:00Z', data: {}}, {time: '2022-01-26T13:00:00Z', data: {}}, {time: '2022-01-26T14:00:00Z', data: {}}, {time: '2022-01-26T15:00:00Z', data: {}}, {time: '2022-01-27T13:00:00Z', data: {}}, {time: '2022-01-27T14:00:00Z', data: {}}, {time: '2022-01-27T15:00:00Z', data: {}}, {time: '2022-01-28T14:00:00Z', data: {}}, {time: '2022-01-28T15:00:00Z', data: {}}, {time: '2022-01-28T16:00:00Z', data: {}}, {time: '2022-01-29T18:00:00Z', data: {}}, {time: '2022-01-29T19:00:00Z', data: {}}, {time: '2022-01-30T08:00:00Z', data: {}}, {time: '2022-01-30T09:00:00Z', data: {}}, {time: '2022-01-30T10:00:00Z', data: {}}, {time: '2022-01-30T11:00:00Z', data: {}}, ]; console.log(getNextNDays(daysdata, 7, new Date(2022,0,23)));