按周分组日期 JavaScript

Question

按周分组日期 JavaScript

18

我有波斯日期的数组，希望按周分组日期。例如，我有以下数组：

[
    "1396-10-11 09:07:21",
    "1396-10-10 10:03:51",
    "1396-10-07 02:07:02",
    "1396-11-27 08:02:45",
    "1396-11-19 01:02:32",
    "1396-12-01 22:13:21",
    "1396-02-12 09:07:21",
    "1396-05-18 04:02:29",
    "1396-05-21 14:01:42",
    "1396-07-11 01:16:29"
]

我希望按周分组日期。

我写了下面的代码，但效果不好：

Array.prototype.groupBy = function(prop) {
  return this.reduce(function(groups, item) {
    var val = item[prop];
    groups[val] = groups[val] || [];
    groups[val].push(item);
    return groups;
  }, {});
}

const formatted = dates.map(elem => {
  return { 
    numberOfWeek: moment(elem.date, 'jYYYY-jMM-jDD').startOf('jMonth').jWeek(),
    date: moment(elem.date, 'jYYYY-jMM-jDD').format('jYYYY-jMM-jDD'), 
    score: elem.score 
  };
});

- Omid Nikrah

你能展示一下你目前尝试过的吗？另外，对于那个数组，期望的输出是什么？ - user3483203

你应该从解析日期开始。一旦你证明了自己能够做到这一点，这里有一个相当冗长的线程，可以确定一天所在的年份周数：https://dev59.com/dW025IYBdhLWcg3wQDlb对于分组，你可以使用一个以周数为键的对象。这些只是我如何处理它的想法。像@chris说的那样，请展示你尝试过什么，我们可以从那里开始。 - wholevinski

@chris 我的代码已添加。 - Omid Nikrah

这里有一个答案可以获取任何日期的年份和周数：在 JavaScript 中像 PHP 一样获取每年的周。但是，您仍需要将输入字符串正确解析为日期。 - RobG

3个回答

11

使用Lodash实现相同效果的另一种简单方法如下:

const groupBy = require('lodash/groupBy');
const moment = require('moment');
const data = [
   "1396-10-11 09:07:21",
   "1396-10-10 10:03:51",
   "1396-10-07 02:07:02",
   "1396-11-27 08:02:45",
   "1396-11-19 01:02:32",
   "1396-12-01 22:13:21",
   "1396-02-12 09:07:21",
   "1396-05-18 04:02:29",
   "1396-05-21 14:01:42",
   "1396-07-11 01:16:29"
];

groupBy(data, (dt) => moment(dt).week());

结果如下：

{ 
  '7': [ '1396-02-12 09:07:21' ],
  '21': [ '1396-05-18 04:02:29', '1396-05-21 14:01:42' ],
  '29': [ '1396-07-11 01:16:29' ],
  '41': [ '1396-10-07 02:07:02' ],
  '42': [ '1396-10-11 09:07:21', '1396-10-10 10:03:51' ],
  '47': [ '1396-11-19 01:02:32' ],
  '49': [ '1396-11-27 08:02:45', '1396-12-01 22:13:21' ] 
}

- Sohail

这似乎是一个不错的选择。 - Him Hah

0

如果你正在寻找一个像我一样的纯粹的原生JavaScript解决方案，我成功地将被接受的答案改编成了使用纯原生代码来替代moment.js。我还不得不在另一个问题中使用了这篇帖子中的PersianDate类的建议。

对于公历，你只需将PersianDate替换为默认的Date类即可。

class PersianDate extends Date {
    constructor(...args) {
        super(...args);
    }

    toLocaleDateString = () => super.toLocaleDateString('fa-IR-u-nu-latn');
    getParts = () => this.toLocaleDateString().split("/")
    getDay = () => super.getDay() === 6 ? 0 : super.getDay() + 1
    getDate = () => this.getParts()[2];
    getMonth = () => this.getParts()[1] - 1;
    getYear = () => this.getParts()[0];
    getMonthName = () => this.toLocaleDateString("fa-IR", { month: 'long' });
    getDayName = () => this.toLocaleDateString("fa-IR", { weekday: 'long' });
}

const dates = [
  "1396-10-11 09:07:21",
  "1396-10-10 10:03:51",
  "1396-10-07 02:07:02",
  "1396-11-27 08:02:45",
  "1396-11-19 01:02:32",
  "1396-12-01 22:13:21",
  "1396-02-12 09:07:21",
  "1396-05-18 04:02:29",
  "1396-05-21 14:01:42",
  "1396-07-11 01:16:29"
];

const groups = dates.reduce((acc, curr) => {
  const date = new PersianDate(curr);
  const startOfYearDate = new PersianDate(date.getFullYear(), 0, 1);
  const weekOfYear = Math.ceil(Math.floor((date.getTime() - startOfYearDate.getTime()) /
    (24 * 60 * 60 * 1000)) / 7);

  // create a composed key: 'year-week' 
  const yearWeek = `${date.getFullYear()}-${weekOfYear}`;
  
  // add this key as a property to the result object
  if (!acc[yearWeek]) {
    acc[yearWeek] = [];
  }
  
  // push the current date that belongs to the year-week calculated befor
  acc[yearWeek].push(curr);

  return acc;

}, {});

console.log(groups);

- TheBay0r

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- YouneL · Accepted Answer

您可以使用moment().week()来获取一年中的周数，然后按周数分组。这里是一个可用的示例，我使用array.reduce创建了一个新对象，其中包含按周数分组的日期:

const dates = [
  "1396-10-11 09:07:21",
  "1396-10-10 10:03:51",
  "1396-10-07 02:07:02",
  "1396-11-27 08:02:45",
  "1396-11-19 01:02:32",
  "1396-12-01 22:13:21",
  "1396-02-12 09:07:21",
  "1396-05-18 04:02:29",
  "1396-05-21 14:01:42",
  "1396-07-11 01:16:29"
];

const groups = dates.reduce((acc, date) => {

  // create a composed key: 'year-week' 
  const yearWeek = `${moment(date).year()}-${moment(date).week()}`;
  
  // add this key as a property to the result object
  if (!acc[yearWeek]) {
    acc[yearWeek] = [];
  }
  
  // push the current date that belongs to the year-week calculated befor
  acc[yearWeek].push(date);

  return acc;

}, {});

console.log(groups);

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